Environmental Technology

Environmental Technologies with Co-benefits

Air Quality

Technology 1300℃-class combined cycle power generation (ACC power generation) technology
Overview ・A combined-cycle power generation system for driving a gas turbine at a high temperature of 1300℃ and driving a steam turbine by the remaining heat.
・A combination of two types of turbines increases the power generation efficiency up to about 55% (low-order calorific value reference).
Company Mitsubishi Heavy Industries, Ltd.,
GE, etc.
Area Stationary generation source
SubArea Electric Power Industry
Categories High-efficiency power generation
Technology Pressurized fluidized bed boiler
Overview ・Coal is burnt at about 850℃ under a pressure of 6 to 20 atmospheric pressure.
・A combustion effluent gas of high temperature and high pressure is used to drive a gas turbine. Power generation efficiency is improved by a combined cycle with steam turbine.
Company IHI, Babcock Hitachi
Area Stationary generation source
SubArea Electric Power Industry
Categories High-efficiency power generation
Technology Integrated coal gasification combined cycle power generation (IGCC)
Overview ・A coal-fired high-efficiency power plant consisting of an air blow two-level entrained bed gasified and /dry type fuel supply system combined with the dry type fixed bed gas purifier or wet type gas purifier
・This system is capable of gasifying coal and converting it into clean fuel, and is characterized by high environment friendly performances in volume reduction and prevention of leaching by slag treatment of ashes.
Company Mitsubishi Heavy Industries, Ltd., Babcock Hitachi
Area Stationary generation source
SubArea Electric Power Industry
Categories High-efficiency power generation
Technology Improved power generation efficiency
Overview Advanced thermal diagnostic method, facility improvement technology and operation
・Existing thermal power plants by maintenance management technology
Company Energy Conservation Association and others (thermal diagnosis)
Boiler manufacturer (facility improvement technology)
Energy conservation Association and others (combustion management)
Area Stationary generation source
SubArea Electric Power Industry
Categories Improved power generation efficiency
Technology Coke dry quencher (CDQ) technology
Overview ・Red-hot coke having a temperature of about 1000℃ is dry-cooled by inert gas in a chamber.
・Inert gas recovers the sensible heat of the red-hot coke. This recovered heat is heat-exchanged with steam by a boiler. The cooled inert gas is again put into the chamber for recirculation.
・The generated steam is used for power generation and as a high-pressure steam or lower pressure steam in the factory.
・As compared with the wet cooling method, this technique improves the strength of coke, without dissipation of steam, dust or gas into the atmosphere. Coke strength is also improved.
Company Nippon Steel Corp., Sumitomo Metal Industries, Ltd., Kobe Steel, Ltd., JFE Steel, etc.
Area Stationary generation source
SubArea Steel industry
Categories Coke dry quenching (CDQ)
Technology Blast furnace gas expander power generation technology
Overview In the blast furnace gas expander power generation, an expansion turbine is installed along the way the blast furnace gas generated in the blast furnace (gas B) is led to the gas holder. While pressure is reduced, the turbine power generator is driven by the pressure energy so that power is generated.
The power recovered in this manner is used to cover about 95 percent of all the power required in the blast furnace plant.
Company Mitsui Shipbuilding Co., Ltd., Nippon Steel Corp., Sumitomo Metal Industries, Ltd, Kobe Steel, Ltd., JFE Steel
Area Stationary generation source
SubArea Steel industry
Categories Blast furnace gas expander power generation technology
Technology Hot-air oven exhaust heat recovery facility
Overview The fuel gas of the hot-air oven and air for combustion are preheated by the heat recovered from the effluent gas of the hot-air oven, thereby achieving:
① Reduction in the amount of hot-air oven fuel gas used, and
② Reduction in the coke ratio in the blast furnace due to the rise in the temperature inside the hot-air oven and blow air temperature
Company Nippon Steel Corp.
Area Stationary generation source
SubArea Steel industry
Categories Exhaust heat recovery
Technology Converter exhaust heat recovery facility
Overview The sensible heat of effluent gas from the converter is recovered and converted into steam.
The generated steam is effectively used in the steel work as high-pressure or low-pressure steam.
Company Nisshin Steel Co., Ltd.
Area Stationary generation source
SubArea Steel industry
Categories Exhaust heat recovery
Technology Sinter cooler exhaust heat recovery facility
Overview Sensible heat is discharged when cooling a high-temperature product sintering ore is cooled in a cooler attached to the sintering device of the iron ore material. This facility recovers this sensible heat and converts it into steam.
Generated steam is used for power generation and as high-pressure or low-pressure steam in the steel work.
Company Sumitomo Metal Industries, Ltd.
Area Stationary generation source
SubArea Steel industry
Categories Exhaust heat recovery
Technology Steel heating furnace exhaust heat recovery facility
Overview Air for combustion is preheated by the heat recovered from the effluent gas of the steel heating furnace, whereby the volume of the fuel used in this furnace is reduced. Further, heat exchange with steam is made by the recovered heat. The generated steam is used as high-pressure or low-pressure steam in the steel work.
Company Kobe Steel, Ltd., etc.
Area Stationary generation source
SubArea Steel industry
Categories Exhaust heat recovery
Technology High-speed switching thermal storage type combustion system
Overview A high-speed switching thermal storage type combustion system capable of ensuring an exhaust heat recovery rate as high as 75 to 80% is used for high-temperature air combustion, thereby achieving substantial energy conservation.
In the high-speed switching thermal storage type combustion system, while one of the burners is operating for combustion, exhaust is discharged by the other burner, thereby heating the regenerator. This operation is switched a short cycle of 20 sec. to 2 min. Air is made to pass through the heated regenerator for the sake of combustion.
This combustion system implements both the high-temperature preheated air combustion and high-temperature exhaust heat recovery.
Company Developed by NFK Holdings
Area Stationary generation source
SubArea Steel industry
Categories High-temperature air combustion
(High performance industrial furnace)
Technology Manufacture of DME
Overview Dimethylether (DME) is manufactured by the direct synthesis method employing the unused coke oven gas (COG) as material. Further, power is generated by the surplus gas (off gas) generated in the DME production process.
Company JFE Steel
Area Stationary generation source
SubArea Steel industry
Categories Manufacture of DME
Technology Power generation by use of heat waste
Overview Power is generated by recovering the exhaust heat from the cement manufacturing facility as a high temperature source. The heat of the preheater effluent gas (about 380℃) and clinker cooler effluent gas (about 250℃) is recovered by the exhaust heat recovery boiler, and power is generated by the steam turbine and power generator.
Company Kawasaki Plant Systems, Taiheiyo Cement Corporation
Area Stationary generation source
SubArea Cement manufacturing industry
Categories Power generation by use of heat waste
Technology Floating roof storage tank
Overview A floating roof is installed on the gasoline or naphthalene storage tank of an oil refinery. Or a vapor recovery facility is installed on the tank lorry outgoing facility, thereby preventing gasoline or naphthalene steam from being emitted and avoiding energy loss due to evaporation. This controls the emission of volatile organic compound (VOC) as a cause for generating photochemical oxidant.
Company Japan Energy Research Center
Yokohama Rubber (tank seal)
IPC (vapor recovery facility)
Area Stationary generation source
SubArea Petroleum product manufacturing industry
Categories Prevention of gasoline steam or others from emitting
Technology In-furnace desulfurization and water spray method
Overview Powder of desulfurization agent such as limestone, quick lime and Dolomite is blown directly into the boiler furnace. This is brought into contact with sulfur oxides (SOx) in the combustion gas and oxygen so that magnesium sulfide is generated. This reaction is used to immobilize the SOx. Limestone is blown in the furnace and water is sprayed from the cooling tower installed between the air heater and dust collector. The desulfurization rate is improved by the secondary desulfurization in the cooling tower.
The desulfurization rate according to this technique is about 80 percent. This facility is characterized by effective water saving and compact configuration.
Company Kawasaki Heavy Industries, Ltd.
Area Stationary generation source
SubArea Industries in general
Categories Simplified flue gas desulfurization
Technology Spray dryer method
Overview Alkali solution or slurry is sprayed into the absorption tower by an atomizer and is brought into contact with the effluent gas. The generated SOx-absorption substance (e.g., calcium sulfite) is dried by gas heat and reaction heat. The resultant powdered substance is caught by the dust collector located downstream. The absorbents used are exemplified by alkali such as sodium carbonate, sodium hydrogen carbonate and calcium hydroxide. The final product is a mixture of sulfate, sulfite and fisheye. This is normally subjected to landfill disposal.
Company Mitsubishi Heavy Industries, Ltd.
Area Stationary generation source
SubArea Industries in general
Categories Simplified flue gas desulfurization
Technology Simplified lime slurry absorption method
Overview This method cuts down the construction cost and running cost while making an active use of the characteristics of the conventional lime slurry absorption method. The desulfurization rate comes to 80%.
This technique is characterized by the following:
1) This is designed in a horizontal configuration in contrast to the vertical configuration of the conventional absorption tower, thereby cutting down the construction cost.
2) The gas speed in the absorption tower is 6 to 9 m/s. This speed is 2 to 3 times the conventional speed, thereby ensuring a compact configuration of the absorption tower.
3) The limestone is coarse grained so that its particle size is 150 m. This is intended to reduce the power consumption.
Company Babcock Hitachi
Area Stationary generation source
SubArea Industries in general
Categories Simplified flue gas desulfurization
Technology Stack built-in type
Overview In this simplified flue gas desulfurization system, the absorption tower and gypsum settling tank are built into part of the stack on the basis of the lime slurry absorption method.  This system is called a stack built-in system.  A liquid column type absorption tower also having a stack function is adopted.  The construction cost and operation cost are cut down by simplified processes.
Company Mitsubishi Heavy Industries, Ltd.
Area Stationary generation source
SubArea Industries in general
Categories Simplified flue gas desulfurization
Technology Briquetting machine
Overview Fuel for household use formed by adding biofuel and quick lime (desulfurization agent) to coal and molded under high pressure
Company Taiyo Tekko Co., Ltd.
Area Stationary generation source
SubArea Household
Categories Biobriquet
Technology 1) Emission from a low-CO2 car: development of fuel cell car, hybrid car, electric car
Overview The volume of CO2 emission during traveling is reduced by improved fuel economy of the car.
Company  
Area Mobile generation source
SubArea  
Categories Improvement of fuel economy
Technology 2) High-efficiency engine: direct jetting type, lean burning, improved engine
Overview The volume of CO2 emission during traveling is reduced by improved fuel economy of the car.
Company  
Area Mobile generation source
SubArea  
Categories Improvement of fuel economy
Technology 3) Improved efficiency of drive system
Overview The volume of CO2 emission during traveling is reduced by improved fuel economy of the car.
Company  
Area Mobile generation source
SubArea  
Categories Improvement of fuel economy
Technology 4) Reduced car weight
Overview The volume of CO2 emission during traveling is reduced by improved fuel economy of the car.
Company  
Area Mobile generation source
SubArea  
Categories Improvement of fuel economy
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Water Quality

Technology Methane fermentation for starch effluent
(Start factory of Agricultural Cooperative of Shihoro City)
Overview After pH adjustment of the effluent containing organic substance of high concentration, methane fermentation is performed to decompose the organic substance so that effluent is purified.  Decomposed organic substances are used as fuel gas.  The remaining organic substance of the supernatant liquor in the methane fermentation tank is subjected to secondary treatment by nitrification and denitrification and membrane separation activated sludge method.  Then it is discharged into a river.
Company Toshiba Corp.
Area Industrial effluent
SubArea Methane fermentation
Technology Methane fermentation for Shochu (distilled spirit) lees
(Shochu lees recycling plant)
Overview The residue of alcohol fermentation and distillation discharged from the sweet potato Shochu manufacturing process, sugar cane waste, and effluent of rice washing are subjected to high-temperature methane fermentation (at 55℃).  After the secondary treatment, such residues are discharged into the sewerage system.  The recovered methane is used as dry fuels for making fuels from the dehydrated cake discharged from the existing methane fermentation tank.
Company Kajima Corporation
Area Industrial effluent
SubArea Methane fermentation
Technology Extra-high pressure gasified methane fermentation system for waste food
Overview The defective and returned products in precooked food manufacturing process (bread, bean curd, noodles, etc.) are sorted out and crushed and is subjected to anaerobic treatment together with factory effluent. Simultaneously with effluent treatment, the crushed organic substances can be recovered as fuel methane gas.
The recovered methane gas is used as a heat source for the factory in generating stream and electric power and in drying.
Company Shinko Environmental Resolution, Kurita Industries, Ebara Corporation, Kubota Kasui Corporation, Mitsubishi Kakoki Kaisha, Ltd., etc.
Area Industrial effluent
SubArea Methane fermentation
Technology Barn wastewater treatment
(Mixing of animal excreta and methanation of pig house wastewater)
Overview The barn excreta are solubilized in a solubilizer tank. After separation of solids, methane fermentation is performed. Digester supernatant liquor is subjected to biological treatment including nitrification and denitrification. Electricity and stream are produced by the methane gas generated from the digester, and are supplied to the treatment site. The separated solids are made into compost fertilizer.
In excreta mixing treatment, the concentration of raw water, nitrogen in particular, is high, as compared with the excreta separation type. It is important to take measures for reducing the environmental load in combination with the feed component management by giving consideration to siting conditions.
Company Mori Plant Co., Ltd.
Area Industrial effluent
SubArea Methane fermentation
Technology Barn wastewater treatment
(Methanization of dairy cow barn wastewater)
Overview Solids contained in the barn excreta are composted and wastewater is subjected to methane fermentation. After that, it is reduced to the pasture. After the surplus liquid compost has been dehydrated, the supernatant liquor is subjected to membrane activated sludge treatment, and is discharged. The dehydrated residue is composted and is made into fertilizer. The generated biogas is used as fuel of the cogenerator and is employed to supply power to the barn wastewater treatment facilities and to heat the methane fermentation tank. The garbage consists of household refuse and school lunch garbage.
Company Kyowa Exio Inc.
Area Industrial effluent
SubArea Methane fermentation
Technology Pulp manufacturing effluent (KP)
Overview In the pulp manufacturing process, the pulp yield rate in the step of cooking is about 50%. Such organic substances as lignin and hemi-cellulose leach out into the cooking chemicals. This diluted black liquid is discharged from the cooking kiln and is separated from the pulp by a cleaning device. After that, it is concentrated by a multiple-effect evaporator so that solid contents will account for 70% or more. The eva-drain water formed by concentration of the steam produced in this process of concentration is subjected to methane fermentation and the organic substance (mainly composed of methanol) in the wastewater is decomposed into methane so that purification is performed. The recovered methane is used as thermal energy.
Company Ebara Corporation
Area Industrial effluent
SubArea Methane fermentation
Technology Pulp manufacturing effluent (SP)
Overview In the SP manufacturing process, the pulp yield rate in the step of cooking is about 50%.
Such organic substances as lignin and hemi-cellulose leach out into the cooking chemicals. This diluted black liquid is discharged from the cooking kiln and is separated from the pulp by a cleaning device. After that, it is concentrated by a multiple-effect evaporator so that solid contents will account for 70% or more.
The eva-drain water formed by concentration of the steam produced in this process of concentration is subjected to methane fermentation and the organic substance (mainly composed of acetic acid) in the wastewater is decomposed into methane so that purification is performed. The recovered methane is used as thermal energy.
Company Nippon Paper Industries Co., Ltd.  (Ezu, Yuhbarai, Iwakuni), IHI, etc.
Area Industrial effluent
SubArea Methane fermentation
Technology Membrane type activated sludge treatment
(Industrial effluent treatment)
Overview The solid/liquid separation of the MLSS in an activated sludge treatment facility is normally performed in a settling tank. This technique employs a membrane instead of a settling tank. Since the solid/liquid separation is easy, the MLSS concentration inside the aeration tank can be kept at a higher level. This allows the aeration tank capacity load to be set to a level 3 to 5 times higher than the normal level. Since the settling tank can be omitted, equipment space saving is achieved. The treatment water is better than that for the conventional activated sludge treatment. The membrane used is exemplified by an MF membrane and UF membrane. The modularized flat membrane or hollow membrane with consideration given to measures against furring is immersed in the aeration tank. This immersion type membrane separator is also used in the process of denitrification and tertiary treatment.
Company Kurita Water Industries Ltd.
Area Industrial effluent
SubArea Aerobic biological treatment
Technology Membrane type activated sludge treatment
(Excreta separation pig house wastewater aerobic treatment)
Overview The excrement and urine of pigs are sorted and collected in a pig house and the excrement is composted.  Urine is provided with coagulant to remove the mixed solids.  After that, it is subjected to nitrification, denitrification and membrane type activated sludge treatment, and is then discharged.  Separated solids are mixed with excrement and are composted.  As compared with excreta mixing type process, the excreta separation treatment is characterized by a lower, nitrogen in particular, raw water concentration.  It is important to take measures for reducing the environmental load in combination with the feed component management by giving consideration to siting conditions.
Company Mori Plant Co., Ltd.
Area Industrial effluent
SubArea Aerobic biological treatment
Technology Membrane type activated sludge treatment
(Sewage treatment)
Overview Solid/liquid separation of MLSS in the activated sludge treatment facility is normally performed in a settling tank.
This technique employs a membrane instead of a settling tank.
Since the solid/liquid separation is easy, the MLSS concentration inside the aeration tank can be kept at a higher level. This allows the aeration tank capacity load to be set to a level 3 to 5 times higher than the normal level. Since the settling tank can be omitted, equipment space saving is achieved. The treatment water is better than that for the conventional activated sludge treatment. The membrane used is exemplified by an MF membrane and UF membrane. The modularized flat membrane or hollow membrane with consideration given to measures against furring is immersed in the aeration tank. This immersion type membrane separator is also used in the process of denitrification and tertiary treatment.
Company Kubota, Ltd.
Area Industrial effluent
SubArea Aerobic biological treatment
Technology Composite organic wastewater biological treatment
(Night soil and digestion tank sludge treatment)
Overview In this system, the natural purification performed by soil fungi under the ground is artificially performed in an incubator. This method is characterized by high-load treatment. Since the margin of sludge load (BODkg/kgMLSS/d) is increased, the BOD elimination rate is higher than that in the standard activated sludge method.
Further, this method ensures treatment of wastewater having a high concentration of BOD10,000 mg/l or more, without any dilution.
Company Chisso Environmental Engineering Co., Ltd.
Area Industrial effluent
SubArea Aerobic biological treatment
Technology Hearth type biological treatment
(Industrial effluent treatment, purification by rivers, lakes and marshes)
Overview Sewage horizontally moves in the reactor filled with a globular carrier having a diameter of 10 cm which is formed by bonding crushed stones with a diameter of 2 to 3 cm with resin. The reactor is supplied with air. Aerobic and anaerobic microbiotas are formed on the surface and clearance of the carrier. The organic substance contained in the polluted water is purified by these microbes.
This technique was put to a field test in the technological area of organic drainage treatment for small-sized business establishments under the Ministry of the Environment in fiscal 1996. This technique was assessed according to the Evaluation of Ministry of Construction (in 1994) and the Evaluation in the New Technological Requirement of the Ministry of Land, Infrastructure, Transport and Tourism (in 2003).
Company AquaTech/Masaki Facility
Area Industrial effluent
SubArea Aerobic biological treatment
Technology Black liquor combustion energy recovery
(Sodium collection boiler)
Overview In the pulp manufacturing process, the pulp yield rate in the step of cooking is about 50%.  Such organic substances as lignin and hemi-cellulose leach out into the cooking chemicals.  This diluted black liquid is discharged from the cooking kiln and is separated from the pulp by a cleaning device.  After that, it is concentrated by a multiple-effect evaporator so that solid contents will account for 70% or more.  This concentrated black liquor is combusted (naturally in the steady state) and is used as a heat source for pulp production.  In the meantime, the inorganic sulfur compound is reduced to sodium sulfide and is captured as smelts including the sodium carbonate on the bottom of the boiler.  Further, it is made water-soluble in a dissolving tank (green liquid).  It is provided with quick lime and is reproduced as cooking chemicals (white liquid).  The quick lime turned into calcium carbonate in this case is baked in a kiln and is reduced to quicklime.
Company Kawasaki Plant Systems, Mitsubishi Heavy Industries, Ltd., Babcock Hitachi, etc.
Area Industrial effluent
SubArea Combustion
Technology Removal of sediment contamination
Overview Removal of sediment contamination consists of a step of dredging of the bottom sediment and a step of purifying the dredged substances.  The dredging work requires use of a sludge dredge boat, backhoe, vacuum car, etc.  Dredged substances are normally moved onto the land by pumping, pneumatic pumping or barge unloader, and are then purified.  The following shows examples of purification.  Coagulant is added to the bottom sediment of the dredged substance, which are then subjected to a step of solid/liquid separation.  Separated water is discharged and solids are dehydrated.  After that, the remainder is used as embankment soil, agricultural soil, etc.  Further, it is solidified by concrete or is directly subjected to landfill disposal.  In the implementation of this technique, sufficient consideration is given to the details of the sediment contamination and surrounding working environment and an economical combination of treatment methods are adopted.
Company Many dredging companies, marine civil engineering contractors, civil engineering contractors, etc.
Area Rivers, lakes and marshes
SubArea Dredging
Technology Pelletization, drying and creation of fuels
(Sewage sludge)
Overview The dehydrated sludge having a water content of 65 to 85% is mixed, kneaded and pelletized.  Then hot air is directly blown into the sludge so that a bio-solid fuel having a diameter of 2 to 5 mm is produced.  Dried and polluted sludges are mixed with coal as fuels for power generation.
Company Nippon Steel Engineering, Sumitomo Heavy Industries, Ltd., Ebara Corporation, Hitachi Shipbuilding Co., Ltd., etc.
Area Public sewage
SubArea Pelletization, drying
Technology Carbonization and creation of fuels
(Sewage sludge)
Overview The sewage dehydrated sludge is baked at about 500℃ for 1 hour to produce granular carbonized fuels.  Carbonized fuels are uses as fuels (with a mixing ratio of about 1%).
Company Mitsubishi Heavy Industries, Ltd., Hitachi Shipbuilding Co., Ltd., Ebara Corporation, Kawasaki Plant System, Sumitomo Heavy Industry Environment Co., Ltd., etc.
Area Public sewage
SubArea Carbonization
Technology Activated carbonization equipment
(Sewage sludge)
Overview While being crushed, the massive sewage dehydrated sludge is brought in contact with hot air in the pneumatic conveying dryer so that granular dry sludges are produced.  This is followed by the step of transporting these sludges to the carbonizing furnace by the ribbon screw.  Then the sludges are carbonized and activated by the externally heated screw carbonizing furnace under the low oxygen atmosphere having a temperature of 800 to 900℃, whereby activated carbon is produced.
Company Kawasaki Plant System
Area Public sewage
SubArea Activated carbonization
Technology Production of biogas
(Sewage sludge)
Overview The surplus sludge and raw sludge generated at the sewage treatment site are subjected to methane fermentation by a digester.  In the conventional system, the digester was separated into 2 tanks; a solid/liquid separator and a thickener.  In the up-to-date version, the 1-level digestion is the mainstream system, where the concentration of the sludge to be input is increased by mechanical and other means, without requiring use of a solid/liquid separation thickener.  The dwell time in 1-level digestion is 20 days, and fermentation is performed at 35℃.  An oval digester may be used in addition to a cylindrical digester, as the case may be.  The sewage sludge has a calorific value of about 4,500 kcal/dry-kg.
Company Kajima Corporation, Shimizu Corporation, etc.
Area Public sewage
SubArea Methane fermentation
Technology Composting equipment
(Sewage sludge)
Overview To permit the use of sewage sludge in a green agricultural land, the dehydrated sludge independently or mixed with coarse organic substances is stabilized by aerobic fermentation.  This is called the compost (sludge compost).  This is called a composting process.  The basic process of the composting equipment is classified into 3 steps as illustrated below; a preadjustment step, fermentation step and production step.  Composted sludges are ranked as sewage sludge fertilizers (ordinary fertilizers).
Company Ebara Corporation, Takuma Co., Ltd., etc.
Area Public sewage
SubArea Composting
Technology Fine bubble aeration device
Overview Fine air bubbles having a diameter of about 1 mm are generated to increase the oxygen dissolution rate.
Company Hitachi Plant Technology, Sanki Industries, NGK Insulators, Ltd., Suido Kiko Co., Ltd., etc.
Area Public sewage
SubArea Energy conservation
Technology Submersible agitator
Overview A horizontal axis type agitator gradually increases the speed of the sewage in the tank by the jet stream generated by the agitation blade. This permits agitation by making effective use of a gigantic circulating flow within the tank, with the result that a greater amount of energy can be saved than that in the vertical shaft type device.
The horizontal type device includes a high-speed submersible agitator having a smaller blade diameter, which makes a greater contribution to the production of a compact configuration of reduced weight. The energy loss is increased by the difference in speeds between the jet stream and circulating flow in the tank.
Company Shin Meiwa Industry Co., Ltd., JFE Engineering (oval digester agitating screw type), etc.
Area Public sewage
SubArea Energy conservation
Technology Energy conservation measures
Overview Energy conservation measures require updating of the equipment.  Thus, inverter control is available.  Further, improvement of the operation management can be achieved by the techniques of intermittent operations, control of the number of devices and optimization of the operation preset values.
Company  
Area Public sewage
SubArea Energy conservation
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Other Environmental Technologies

Air quality

(Published in March, 2010. All rights reserved)

Water quality

(Published in November, 2013. All rights reserved)

(Published in March, 2010. All rights reserved)

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