Is it possible to filter sewage directly with membranes without sludge culture?
Cannot! If the membrane is directly used to separate the pollutants, the fouling of the membrane will occur quickly, and the separated pollutants will be enriched to a certain extent, so that the membrane cannot continue to be separated.
Can the membrane isolate COD and ammonia nitrogen?
The pollutants are degraded by microorganisms, and the COD and ammonia nitrogen of the effluent cannot be directly reduced by the separation function of the membrane. Some pollutants with a particle size larger than the pore size of the membrane can be isolated by the membrane. The main function of the membrane is to isolate the microorganisms and ensure that the effluent has no suspended solids.
How to solve uneven aeration?
a. Check whether the aeration volume and air pressure are sufficient. Too low aeration volume will reduce the aeration and scouring effect of the diaphragm, and mud may be trapped between the diaphragms, causing the aeration channel between the diaphragms to be blocked.
b. The vent valve is regularly opened for flushing, and the negative pressure formed by the aeration and venting flow dredges the blocked aeration holes of the aeration pipe. When the vent valve is opened, the self-priming pump must be stopped!
c. Check whether the sludge concentration is too high. Too high sludge concentration may cause mud between the membranes, resulting in blockage of the aeration channel between the membranes.
If the diaphragm needs to be taken out for inspection on site, and it will take a long time to be placed outside, how should the diaphragm be stored after being taken out?
Place it in a dark place and keep it moisturised with water every few hours, preferably soaked in clean water.
What are the reasons why the self-priming pump cannot discharge water and how to deal with it?
a. Check whether the water inlet and outlet pipes of the self-priming pump are installed correctly, and whether the impeller of the self-priming pump is turned correctly.
b. Check whether the liquid level of the membrane tank is too low and it is difficult to discharge water.
c. Check whether the pipelines and valves above the water surface of the self-priming pump and the water surface of the membrane tank are leaking.
d. Check whether the negative pressure of the negative pressure gauge is high, and judge the film blocking situation.
Why should the self-priming pump run for eight minutes and stop for two minutes?
In order to ensure that the membrane surface is flushed online for 2 minutes every 10 minutes of operation. When the self-priming pump is pumping, the pollutants attached to the surface of the membrane are more easily washed away in the two minutes when the self-priming pump is out of operation, reducing the occurrence of membrane fouling.
Why can't the self-priming pump be turned on without aeration?
On the one hand, the function of aeration is to supply oxygen to the microorganisms in the membrane system;
When the aeration is not turned on, the membrane surface is not washed by air and water during the process of pumping water by the self-priming pump, which belongs to dead-end filtration.
How to solve the problem of excessive foam after washing the film?
a. Before the components are exposed to the air, turn on the self-priming pump to discharge a small amount of water, and discharge the cleaning liquid.
b. Spray the foam with clean water.
c. Dosing defoamer, pay attention to adding non-silicon defoamer!
What is the reason for the foam in the aeration tank after washing the membrane?
After washing the membrane, the environment of the membrane pool is slightly damaged, and the microorganisms attached to the membrane surface are killed and become pollutants in the pool. These changes will cause the membrane pool to be aerated in a short period of time after washing the membrane. After running for a period of time, the environment in the pool will return to normal, and the situation with more foam will automatically recover.
Why should the film washing and dosing time be controlled at about 15 minutes?
The purpose of fast dosing is to ensure that each membrane is filled with liquid medicine as much as possible, and a large amount of liquid medicine will not penetrate into the membrane surface and be wasted.
Can a high-pressure cleaning water gun be used when cleaning the diaphragm offline?
Considering the portability of on-site cleaning, a high-pressure cleaning water gun can be used to clean the mud stuck on the membrane surface, but it is necessary to control the cleaning pressure (50cm from the palm of the hand can withstand it), and the water nozzle head adopts a distributed nozzle head.
What are the causes of mud jams and how to solve them?
a. The negative pressure is too high and it has not been cleaned for a long time;
b. The air volume is too small and the purging is insufficient;
c. Long-term non-venting causes uneven aeration;
d. When the self-priming pump is not in operation, stop 2 and pump continuously;
e. The long-term sludge concentration is high and the sludge is not discharged;
Solution: Offline cleaning
What are the reasons for the blocked membrane and the small water output?
a. The self-priming pump runs continuously without stopping according to operation 8;
b. The operating flux is greater than the design value;
c. Aeration problems (uneven aeration, insufficient air volume);
d. Activated sludge problem (no activated sludge cultivation, poor sludge properties)
e. Water quality problems (raw water has high oil content, high calcium and magnesium ion concentration or high content of refractory biodegradable substances.)
How to solve turbid water?
a. To lower the liquid level, add clean water from the dosing port to check for leaks.
b. Use a small self-priming pump to check the diaphragm.
What is the cause of turbid water?
a. Underwater pipeline valve leakage;
b. The water collecting main pipe of the membrane module is damaged;
c. The silicone hose is loose or damaged;
d. The water outlet head is broken;
e. Diaphragm damage;
How does the aeration vent pipe work?
Turn off the production water pump, open the open valve, and clear the blocked aeration holes of the aeration pipe through the negative pressure formed by the aeration and air flow;
Conditional vent valve is opened once a day for about 3 minutes each time;
When the vent valve is open, the self-priming pump must be stopped!
What are the core considerations for MBR?
a. Flux matching;
b. Sludge cultivation;
c. Run 8 and stop 2;
d. Evenly aeration
What is the principle of aeration and venting?
When venting, the gas is discharged from the discharge port, and negative pressure is formed in the pipeline, thereby dredging the aeration holes.