TIANJIN TEDA Projects

 

 

 Introduction
Tianjin TEDA is an important national economy development area in Tianjin city, north China. The WWTP in TEDA was built in December 1999, whose designed scale is 100,000m3/d. MOTIMO cooperated with TEDA WWTP to build the recycled reclaimed water project, using CMF system From 2003. The inlet water of the system is the standard produced water of TEDA WWTP, and the CMF permeation goes into RO desalination system.

 Scope of Work
MOTIMO has undertaken and completed CMF system design, UF membrane manufacture, equipment installation and commissioning.

 General Information

  • The project phase one (5,000 m3/day) completed by MOTIMO has been operated well since 2003.
  • The project phase two (5,000 m3/day) completed by MOTIMO has been operated well since 2005.
  • The project phase three (20,000 m3/day) completed by MOTIMO has been operated well since 2008.
  • MOTIMO will start the project phase four (20,000 m3/day) in the near future.
  • MOTIMO membrane has been replacing the original famous UF membrane step by step these years.
  • The CMF permeate is treated by RO system directly and the final permeate is supplied for Toyota, BHE thermal power and other factories in TEDA.

 Membrane Information

MOTIMO UOF-4 membrane modules (material PVDF, effective membrane area 40m3, pore size 0.03μm) were used in the CMF system, which is composed of 14 skids MT-CMF-50, with 50 membrane modules each skid and totally 700 membrane modules. Each skid runs independently producing constant flow of water.
The average membrane flux is 53LMH (peak instantaneous flux is 65LMH), water quality meets the RO inlet water requirements.
  

 Process
Fourteen skids MT-CMF-50 with totally 700 membrane modules.
Control system consists of PLC, project control computer, on-site instrumentation, automatic valves, and remote monitoring computer with both manual and automatic functions.
Backwash System serves for MT-CMF-50 skids periodically.
Dosing system prepares for the chemicals during backwash or chemical cleaning.
Cleaning system can keep regular chemical cleaning for the CMF to ensure the excellent recovery rate of membrane flux.
Air supply system consists of air compressor and gas storage tank, supplying gas to membrane air scrubbing and pneumatic instrument.

CMF Layout

 
 

Table 1 CMF system permeate quality

No.

Item

Unit

Index

1

PH

 

6.9

2

Temperature

°C

12-25

3

COD

mg/L

43

4

BOD5

mg/L

<2

5

Turbidity

NTU

0.09

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

3250

13

Dissolved solid

mg/L

2106

Table 2 CMF system operation parameters

No.

Item

Content

1

Operation flux per square meter

Max 65LMH
Average 53LMH

2

Maximum inlet water pressure

0.2MPa

3

Maximum TMP

0.15MPa

4

Temperature

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

50s

15

CEB period

24 h

Conclusion
Theimplementation of the project can achieve the water resource utilization, thus the discharge of wastewater can be greatly reduced and the surrounding environment is significantly improved. We can know from practical application of the project that MOTIMO’s CMF system has been advanced and it is a reliable technology, which plays an important role in making wastewater become resources. From the actual operation data, the technical and economic indicators have reached the design requirements, and achieved good economic and social benefits. In the course of the project operation, MOTIMO positively know the site’s work needs, and carried out the after-sales service seriously and responsibly.

   

 

 

 

 

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