General Information
Designed scale: UF system 72,000m³/d, RO system 50,000m³/d, which is currently China's largest double-membrane wastewater treatment and reuse project.

Membrane Info
CMF system uses MOTIMO UOF4 membrane module, which is composed of 33 skids MT-CMF-50 (30 use 3 standby), each skid has 50 membrane modules, totally 1650 outside-in hollow fiber membrane modules, which are all made of PVDF and the pore size is 0.03μm, each runs independently producing constant flow of water. The system’s maximum treatment capacity is 72,000 m3/d.
The project uses UOF-4 PVDF membrane module produced by MOTIMO, the effective membrane area is 40m2, the average flux of membrane system is 53LMH (peak instantaneous flux is 65LMH), and the product water’s quality is in line with the requirements of the reverse osmosis water.
 

 Process
raw water’s quality: integrated river discharge wastewater + Gegu town domestic wastewater + Rockcheck Steel Company steel wastewater.
Produced water’s quality : achieve the 1st RO desalination water standard
Produced water’s application: Tianjin Rockcheck Steel Company steel production water
The system can effectively remove impurities, reduce turbidity, suspended solids and colloidal materials, and reduce pollution index (SDI), to maximizedly guarantee the safe operation of reverse osmosis systems, The produced water of CMF system can reach the following targets:
Produced water’s turbidity: ≤ 0.2NTU
SDI:≤ 3
SS: ≤ 1 mg/L

Project	Raw water	Scale ( T/D)	Process	Application	Time
A hospital in Tianjin Wastewater treatment project	Hospital wastewater	500	MBR	Reach the discharge standard	03.05
A Subsidiary Hospital of a University  Wastewater treatment project	Hospital wastewater	500	MBR	Reach the discharge standard	07.10
An industrial park in Tianjin MER reclaimed water reuse project	Comprehensive Wastewater	30,000	MBR	Landscape Irrigation + Miscellaneous water	07.06
A  Real Estate InvestmentCompany Domestic sewage treatment project	Domestic sewage	4,500	MBR	Landscape Irrigation	09.09
A University Domestic sewage treatment project	Domestic sewage	500	MBR	Landscape Irrigation + Domestic Miscellaneous water	06.04
A Real Estate Development Company Domestic sewage treatment project	Domestic sewage	2,000	MBR	Domestic Miscellaneous water	08.07
A Oily Water Treatment Station in Tianjin Port Domestic sewage treatment project	Domestic sewage + water-ballast	1,800	MBR	Port Miscellaneous water	06.10
An airport Wastewater Treatment Project in Korea	Airport waste water	3,000	CMF	Airport Miscellaneous water	03.09
A Electric Power University  Domestic sewage treatment project	Domestic sewage	1,100	MBR	Landscape Irrigation	08.08
Olympic Equestrian Venue in Sha Tin Hong Kong	Racecourse Wastewater	200	MBR	Miscellaneous water	08.06

Table 1, ROCKCHECK Sewage Treatment Plant CMF System Outlet Water Quality

No.	Item	Unit	Index
1	PH		6.66
2	Temperature	°C	12-25
3	COD	mg/L	48
4	BOD5	mg/L	<2
5	Turbidity	NTU	0.074
6	SS	mg/L	<1
7	TN	mg/L	<10
8	T-P	mg/L	<0.2
9	Coliform	pcs/L	None
10	Total bacteria	pcs/mL	0
11	Residual Chlorine	mg/L	<1
12	Conductivity	ms/cm	3550
13	Dissolved solids	mg/L	2300
14	color		10
15	TOC	mg/L	6.1

Table 2, ROCKCHECK Sewage Treatment Plant CMF System Main Operating Parameters

No.	Item		content
1	Operation flow (12~25°C, 0.1MPa)		Max:65LMH Average: 53LMH
2	Maximum inlet water pressure		0.2MPa
3	Maximum TMP		0.15MPa
4	Temperature range		12~25°C
5	Water flow/circulation method		Cross flow
6	Maximum backwash water quantity		75LMH
7	Control method		Stable flow
8	Air consumption		5.0m3/h·module
9	Air wash pressure		≤0.05MPa
10	Backwash water consumption	water and air	0.5m3/h·module
11		water only	2.5m3/h·module
12	Backwash water pressure		≤0.05MPa
13	Backwash time	water and air	40s
14		water only	40s
15	CEB period		24h

 Turbidity

 

 Flux And TMP

 Conclusion
In the ecological view of the current rapid economic development, when facing bottleneck problem with the water shortage in the steel industry, Tianjin Rockcheck Steel Company’s water recycling projects optimize and integrate with the advanced wastewater treatment, water preparation, process water, and balancing water technologies such as multi-core set of technological utilization of water resources from the urban sewage, sewage and wastewater from the river by the independent innovation and R & D, as well as the advanced treatment to the multi-source and non-conventional source of water resulted from the iron and steel production to reclaim and reuse for the enterprises to open up a new means of water supply, saving the new water at the same time ,reach a total reduction of pollutants and protect the surrounding environment.