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Increase of sewage and deterioration of its quality due to rapid urbanization and industrialization cause serious environmental pollution every year. Improvement of sewage treatment systems in thus an urgent need to solve this situation. Various processes are employed for sewage treatment because all waste water, without exception, differs in composition and concentration, and advanced technologies for removal of nitrogen and phosphorus are required. Hitachi Plant Technologies offers a variety of processes and systems in the field of sewage treatment to supply safe potable water constantly.
Grit Chamber and screen Facilities
Feature
- As screenings and grit are transported through piping, no foul odors are generated and sewage and filth are not scattered. These waste products are transported while being mixed and agitated with pressurized water. This sanitary method provides a maximum cleaning effect.
- By switching the pressure water valve, the jet pump can automatically transport refuse and lift grit from a multiple number of tanks.
Settling Tank Facilities
Collecter
- Flight chain type
- Reciplo type
- Circular type
Flight chain type
Reciplo type
Circular type
Aeration Tank Facilities
Sludge Dewatering Facilities
- Digestion Facilities
- Thickening Facilities
- Dewatering Facilities
The digestion tank facilities conduct sludge digestion, anaerobic bacteria and collect methane gas. The gas tank facilities store the methane gas collected from the digestion tank. The energy stored in the tank will be reused as an energy source for heating boilers and driving gas power generators.
Ovel Digestion Tank
Screw Type Sludge Mixer
Digestion Tank
Low-pressure Gas Tank
Medium-pressure Gas Tank
The dewartering facilities mechanically dehydrate concentrated sludge and digested sludge. These facilities reduce considerably the amount of sludge discharged from the treatment system.
- Screw Press type
- Belt Press type
- Centrifugal type
Oxidation Ditch System
The oxidation ditch system performs biological oxidation of organic substances through simultaneous circulation and aeration of wastewater by the function of the aeration unit installed in the circulation ditch. This system can be easily maintained because it performs stable treatment over time regardless of changes in the amount and quality of incoming sewage.
