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JINCHUAN GROUP
Project name: Jinchuan Group Thermal Power Co., Ltd.

Location: China

Total capacity of water treatment system: 400 m3/hr permeate

Feed water sources: Water from Hexibao reservoir + surface water

Water treatment process: MMF+ UF+ 2 stage RO +IX(MB)

Challenge: High pH, high organic fouling and high bacteria count

System operation time: Since May 2011


1. INTRODUCTION
Jinchuan Group Thermal Power Co., Ltd.
This plants daily needs 400m3/hr permeate.
The pretreatment of this system consists of MMF and UF before the water is fed into the reverse osmosis system.  

Table 1: Data of Using Ochemate CPE4000 (example of data from a single skid)

Date

Pressure(MPa)

Flow(m3/h)

Conductivity(μs/cm)

Rejection

%

Recovery

%

T

℃

Feed

intersegment

treated

product

treated

feed

product

2012/3/20

1.1

0.92

0.8

115

40

547

10

98.1

74.1

12

2013/4/5

1.16

0.98

0.89

118

40

550

12

97.8

74.6

24

2014/5/12

1.15

1

0.8

116

38

597

15

97.4

75.3

18

2015/3/30

1.12

0.99

0.89

117

39

567

17

97

75

20


2. Challenge 
The feedwater from the reservoir and surface water contains high level of iron, organic and microorganism and which fouls the UF membrane . Even with the UF as upstream pretreatment for RO , some organics and microorganism are still carried over and eventually fouled the RO membrane system. 

      

     Example Picture of organic and biofouling at tail of RO Membrane


3. Solution
After a series of test conducted , Ochemate CLN751 , Ochemate CLN771 and Ochemate CLN711 is used to clean ultrafiltration and reverse osmosis system membranes . To further prevent biofouling in the  system , Ochemate TBC9527 a non oxidizing and fast acting biocide is used to sterilized the system.                    
Table 1: Contains data before and after cleaning for ultrafiltration :

Date Pressure(MPa)

Flow

m3/h

Feed Product
2013/10/30 0.16 0.04 90
2013/11/1 0.1 0.04 140

Table 2: Contains data before and after cleaning for RO system

Date Pressure(MPa) Flow(m3/h) Conductivity（μs/cm）

Rejection

%

Recovery

%

T

℃

feed interstage treated product treated feed product
2013/10/30 1.12 0.93 0.79 100 38 567 16 97.1 72.4 25
2013/11/3 1 0.9 0.8 120 40 630 12 98.1 75 24.5


            


Conclusion
The antiscalant CPE4000 is effective in preventing scaling in the RO systems with water from reservoir and surface water.
The performance for both UF and RO system is also restored after cleaning with Ochemate CLN751, Ochemate CLN771 and Ochemate CLN711. 

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