Inner Mongolia Jiutai New Materials Co., Ltd. Polyethylene Glycol Production Line Wastewater Treatment Project

The wastewater treatment project of the polyethylene glycol production line of Inner Mongolia Jiutai New Materials Co., Ltd. mainly treats the waste liquid generated during the polyethylene glycol production process, production equipment washing water, flushing water, and cooling water. The treatment capacity of the project is 12000 m3/d, and the main process is "AAO+Ceramic membrane ultrafiltration+RO reverse osmosis". After reverse osmosis treatment, the ultrafiltration effluent reaches the cooling water and boiler make-up water standards in the Urban Sewage Recycling and Reuse Industrial Water Quality (GB/T 19923-2005), and the rest is directly discharged. The designed inlet and outlet water quality is detailed in the table below.

Serial Number	Control project	Unit	System inlet water quality	Reuse water outlet quality
1	pH		≤ 6~9	6.5~8.5
2	CODCr	mg/L	≤700	<60
3	BOD5	mg/L	≤300	<10
4	Turbidity	NTU	-	＜1
5	SS	mg/L	≤150	Not detected
6	Ammonia nitrogen	mg/L	≤350	<10
7	Phosphorus	mg/L	≤2.5	<1
8	Chloride ion	mg/L	≤400	<250
9	Sulfate	mg/L	≤300	<250
10	silica		≤100	≤30
11	Total hardness (calculated as CaCO3)	mg/L	≤1000	<450
12	TDS-Total dissolved Solid	mg/L	≤2600	<1000
13	Cutter	mg/L	-	<0.30
14	Manganese	mg/L	-	<0.10
15	Fecal coliform bacteria group	个/L	-	2000
16	Free residual chlorine	mg/L	-	0.05
17	Petroleum	mg/L	≤1	≤1
18	Animal and vegetable oils	mg/L	≤1
19	Water temperature	℃	The minimum water temperature in winter is considered at 10 ℃