Project Name: Zhongwei coal oil production company
Project indirect:
A coal oil company is a state-owned enterprise that produces formaldehyde and oil. The waste water in the gasification workshop is ash water, and the water volume is about 100t/h. A well-known brand film was used in the factory, resulting in a large number of wire breaking and scaling. Figure:
In order to ensure the production water of gas workshop, the original 1 # membrane pond ash water MBR was replaced, and the backwashing system was added.
Designed water yield | 86m3/h |
Design flux | 10L/m2·h |
Design turbidity of water production | ＜4NTU |
Running time | 24 hours continuous operation |
Actual water yield | ＞86m3/h，Considering the inlet water volume, half of the valve opening has reached the designed water yield. |
Actual running water turbidity | ＜1NTU |
Number of membrane boxes | 8 sets, each containing 54 pieces of MW20b diaphragm. |
The relevant installation pictures are as follows:
Raw water quality map (grey water)
Diaphragm mounting diagram
The main operational data during the system test are as follows:
Water volume reaches design flow 42m3/h per class water production data is shown in table below.
Table 11 water yield data of membrane system
date | 4.26—4.27 | 4.28-4.29 | 4.30-5.01 | 5.01-5.02 | |
System water yield（m³） | Day shift | 403 | 411 | 487 | 436 |
Night shift | 445 | 430 | 488 | 443 | |
Table 22 water yield data of membrane system
date | 5.4—5.5 | 5.5-5.6 | 5.7-5.8 | 5.9-5.10 | |
System water yield（m³） | Day shift | 402 | 416 | 439 | 403 |
Night shift | 377 | 426 | 469 | 446 | |
Note: Because of the large amount of data and the little difference in water production per day, some data were selected to show the water production capacity of the membrane.
Negative pressure produced by membrane water production
The load test of the membrane was carried out after the installation. At this time, the membrane has been running in the membrane pool for more than a month. In the load test under the sub-conditions, we can see from the table above that the negative pressure has no obvious change with time, basically keep floating around a straight line. This proves that JF membrane can maintain a certain negative pressure under long running conditions. The negative pressure of No. 1 system fluctuates at 0.026 accessory and that of No. 2 membrane system fluctuates near 0.016 at design flow rate. No. 1 system is located near the pump house. The sludge may accumulate more near the bottom of the pool due to the flow direction problem. The negative pressure value of the two systems is different due to the self-priming pump itself. However, the negative pressure has no obvious change during the test period, which indirectly indicates that the membrane has good anti-pollution ability.
Turbidity data table for membrane system No. 1
date | 4.26—4.27 | 4.28-4.29 | 4.30-5.01 | 5.01-5.02 | |
System turbidity（NTU） | Day shift | 0 | 0 | 1 | 0 |
Night shift | 0 | 0 | 1 | 0 | |
Turbidity data table for membrane system No. 2
date | 5.4—5.5 | 5.5-5.6 | 5.7-5.8 | 5.9-5.10 | |
System turbidity（NTU） | Day shift | 0 | 0 | 1 | 1 |
Night shift | 1 | 1 | 1 | 1 | |
It can be seen from the above table that the turbidity of the system is basically 2 and 1 data. Turbidity composite design requirements. The turbidity of the No. 2 system rose to about 8 on May 3. It was checked that the suction hose was loosened during operation, which resulted in the suction of raw water into the hose and increased the turbidity. When the suction hose is tightened, the turbidity is restored to 0. This proves that the filtration accuracy of the membrane meets the requirements and performs well.