Project name: a coal to liquid branch of Zhongwei
Project indirection:
A coal to oil branch is a state-owned enterprise manufacturing formaldehyde and oil. Among them, the production waste water of the gas making workshop is gray water, and the water volume is about 100t/h about. A famous brand of membrane was used in the factory, and a large number of broken wires and scaling occurred. As shown in the figure:
To ensure the production water in the gas making workshop The ash water MBR of 1 # membrane tank was replaced and the backwashing system was added.
Design water yield | 86m three /h |
Design flux | 10L/m two · h |
Design effluent turbidity | Less than 4NTU |
Run Time | 24-hour continuous operation |
Actual water yield | More than 86m three /h. Considering the water inflow, the design water yield has been reached when the valve is half opened |
Turbidity of produced water in actual operation | Less than 1NTU |
Number of bellows | 8 sets, each containing 54 MW20b diaphragms |
The relevant installation pictures are as follows:
Raw water quality diagram (grey water)
Diaphragm installation drawing of diaphragm box
The main operation data statistics during the system test are as follows:
Water volume Reaching the design flow of 42m three /H Water yield data of each shift is shown in the table below
surface 1 Water yield data sheet of No. 1 membrane system
date | 4.26—4.27 | 4.28-4.29 | 4.30-5.01 | 5.01-5.02 |
System water yield (m ³） | day shift | four hundred and three | four hundred and eleven | four hundred and eighty-seven | four hundred and thirty-six |
night shift | four hundred and forty-five | four hundred and thirty | four hundred and eighty-eight | four hundred and forty-three |
surface 2 Water yield data sheet of 2 # membrane system
date | 5.4—5.5 | 5.5-5.6 | 5.7-5.8 | 5.9-5.10 |
System water yield (m ³） | day shift | four hundred and two | four hundred and sixteen | four hundred and thirty-nine | four hundred and three |
night shift | three hundred and seventy-seven | four hundred and twenty-six | four hundred and sixty-nine | four hundred and forty-six |
Note: Due to the large amount of data and little difference in daily water production, some of them are selected to show the water production capacity of the membrane
Negative pressure of membrane water production
The membrane load test is carried out after the installation is completed. At this time, the membrane has been running in the membrane tank for nearly one More than one month. When carrying out load test under sub conditions, we can see from the table above that the negative pressure has no obvious change over time and basically keeps floating near a straight line. This proves that Jiefu brand membrane can maintain a certain negative pressure under long-term operation conditions. one The negative pressure of No. 2 system under the design flow condition is zero point zero two six Attachment float, two The negative pressure of membrane system is at zero point zero one six Floating nearby. one No. 1 system is located at the side close to the pump house. Due to the problem of water flow direction, there may be more sludge at the bottom of the pool near the pump house, which is also caused by the factors of the self-priming pump itself two The negative pressure values of the system are different, but the negative pressure does not change significantly during the test, which indirectly indicates that the membrane has good anti pollution ability.
one Turbidity Data Sheet of No. 1 Membrane System
date | four point two six — four point two seven | 4.28-4.29 | 4.30-5.01 | 5.01-5.02 |
System turbidity（ NTU ） | day shift | zero | zero | one | zero |
night shift | zero | zero | one | zero |
two Turbidity Data Sheet of No. 1 Membrane System
date | five point four — five point five | 5.5-5.6 | 5.7-5.8 | 5.9-5.10 |
System turbidity（ NTU ） | day shift | zero | zero | one | one |
night shift | one | one | one | one |
It can be seen from the above table that the turbidity of the system is basically 2 and 1 data. Composite design requirements for turbidity. On May 3, the turbidity of No. 2 system rose to about 8. It was checked that the suction hose was loose during operation, which led to the suction of raw water in the pipe, which increased the turbidity. When the suction hose is tightened, the turbidity returns to 0. This proves that the filtration precision of the membrane meets the requirements and performs well.
