200-100,000 m3/day INSTALLATIONS AND WORKS
SAMPLE DESIGN OF A 200 m3/day BIOCHEMICAL SEWAGE PURIFICATION STATION
The sewage is self-flowing to the waste pumping plant (WPP) with a container catching large waste. After the WPP the sewage is pumped to the combined works' mixing chamber with a sand-catching container for stopping the waste of up to 3 mm size and sand.
The waste entrapped is jack-driven to the waste tank, and then periodically (once a week) transported by vehicles to the dump.
While in the mixing chamber, the sewage is mixed with the sludge mixture arriving from the settling aerotank. Then the mixture is driven by a circulation pump to the biofilter spray system consisting of water-distributing chutes with outlet pipes and reflecting disks. The falling liquid jets are broken upon the disks thus irrigating the biofilter feed. After the biofilter the liquid is driven by a collecting tray to air-spripping towers into which air is sucked. The air-spripping towers distribute the air mixture over the aeration tank inside. The sludge mixture displaced from the aeration zone is discharged to the settling zone where it is split. Some part of the sludge is compacted and driven back to the aeration zone through a slot, while the rest of the sludge, together with the transit flow is floating up thus making a suspended sludge layer which catches small impurity particles. The biomass (biofilm and active sludge) within combined functions in a full oxidation mode (at a low oxidation speed and load upon the sludge), which provides a developed nitrification process within the CWs. The active sludge is characterised with high mineralisation (35% ash content) quality and low specific resistance (33…45)x10-10 cm/g. The purified water is gathered by drainage chutes and self-driven for afterpurification to the artificial feed bioreactors. Regeneration of the bioreactors' feed is done periodically by way of alternate emptying of the vessels and water-washing of the feed. The bioreactors' sediment is driven to WPP. After the bioreactors, the purified water self-flows to the ultraviolet installation or contact reservoir, where it is disinfected. Natrium hypochlorite is produced by an electrolysis installation.
| Back | Next | 1 | 2 | 3 | 4 | 5 | 6 |
Contact us 
We are in search of partners for joint implementation of the above technology.
|