Wastewater treatment plant

1)Balanced pool+external MBR+nanofiltration/reverse osmosis,the clean water rate is 85% or more 2)Qualified effluent standard

The sewage(leachate) flows to the adjusting pool through the drainage. The main function of adjusting pool is to regulate the amount of water, it can not purify the wastewater. So we install the balanced pool to regulate the quality of water. For example, mixed the new leachate to the old one in order to obtain the appropriated ratio of carbon and nitrogen. The leachate is pumped up to the balanced pool.

The leachate in the balanced pool is elevated to the external membrane biochemical reactor through the water distribution system by a pump. Before the water distribution system, there is a 400-800um filter bag to prevent big particles of solid matter into the follow-up unit.

External membrane biochemicalreactor is consisted of denitrification, nitrification and external ultrafiltration unit.

After the treatment of ultrafiltration, the liquid goes to the next  nanofiltration system and to be further processed, the clean water rate is 85% or more, it reaches the qualified discharge standard. The concentrated liquid generated by nanofiltration is flowed back to  the landfill.

After the water has been processed by biochemical treatment, if the nitrogen is not completely removed, some or the whole of water will be done reverse osmosis treatment. The concentrated liquid is sent back to the landfill.

The residue sewage sludge and concentrated liquid are transported  to a pool. Using a pump to convey them back to the landfill.

Specification

Ozone dosage	10(g/h)
The amount of air	1(m3/min)
Air tank volume	1(m3)
Flowmeter specifications	1(m3/h)
Outlet caliber	1(mm)
Pipe' inner diameter	1(mm)
Dimensions	1(cm)
Aerator power	2.2(kw)
Pump power	2.2(kw)

The purification effect of each procedure

Procedure		The amount of water(m3/d)	CODcr (mg/L)	BOD (mg/L)	NH3-N (mg/L)	TN (mg/L)	SS (mg/L)
MBR	inflow of water	100	15000	7500	2500	2800	800
	outflow of water	100	<800	<20	<10	<40	<10
	removal efficiency		<94.7%	<99.73%	<99.6 %	<98.6 %	<99%
NF/RO	inflow of water	100	<800	<20	<10	<40	-
	outflow of water	85	80	10	-	-	-
	removal efficiency		90%	50%	-	-	-
Emission requirements			100	30	25	40	30

                            Process Flow Diagram for a typical large-scale wastewater treatment plant

Wastewater treatment plant