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5.
4.
3 Kubota flat membrane operation
①The blower of the liquid-in-liquid membrane is generally designed according to 7L/min per membrane (1600mm×500mm), and the air volume of the blower is generally not adjusted during operation
.
The blower runs continuously for 24 hours
② The size of the suction pump is designed according to the number of membrane modules
.
During operation, in order to remove pollution, a method of opening for 9 minutes and stopping for 1 minute is adopted, which is generally controlled by a computer automatically
③The flow rate of the circulating sludge pump is generally selected to be 2 to 3 times of the water intake, and it runs continuously
.
④The remaining sludge pump runs regularly according to the reading of the MLSS meter in the pool
.
The concentration of MLSS in the pool is generally controlled at 15000～20000mg/L
⑤ A pressure gauge is installed in the inlet pipe of the suction pump, and the degree of membrane fouling can be understood through the reading of the pressure gauge
.
During the initial operation, the pressure loss is very small.
5.
4.
4 Cleaning of Kubota flat membrane
Use sodium hypochlorite (mass fraction 0.
5%) and oxalic acid (mass fraction 0.
5%) for chemical cleaning.
The cleaning process diagram is shown in Figure 5-13
.
The cleaning steps are as follows:
Figure 5-13 Cleaning of Kubota flat membrane
① Turn off the suction pump and blower first;
②Slowly inject the liquid medicine into the membrane module through the medicine inlet installed on the upper part of the membrane module;
③Soak for about 1.
5h and then use a suction pump to discharge the liquid medicine;
④Inject another medicine and repeat the previous steps;
⑤The whole cleaning process lasts for 4～5h;
⑥ Recover for 6-12 hours and start filtering.
Note that the initial flux should drop below 50% of normal operation and then gradually increase until it is completely normal
.
5.
4.
5 Operational efficiency of Porlock wastewater treatment plant
The effluent BOD of this process is less than 5mg/L, which is not affected by the influent BOD
.
The average turbidity is 0.
Table 5-13 Operational efficiency of Porlock wastewater treatment plant
