Summary of process principle and characteristics of MBR integrated sewage treatment equipment, with process flow attached.

MBR integrated sewage treatment equipment separates sewage from liquid through membrane module, and sludge flows back to bioreactor and then is discharged through water body. MBR sewage treatment process, also known as membrane bioreactor, is a new sewage treatment technology which combines membrane separation unit and biological treatment unit. Through the application of membrane, the role of bioreactor is strengthened, so the application of membrane plays an important role in MBR integrated sewage treatment equipment. According to membrane structure, it can be divided into flat membrane, tubular membrane and hollow fiber membrane, and according to membrane pore size, it can be divided into microfiltration membrane, ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane. It uses membrane to intercept macromolecular organic matter and activated sludge in biochemical reaction tank, which saves the step of secondary sedimentation tank and reduces the occupied area.

Schematic diagram of operation process of MBR integrated sewage treatment equipment:

Characteristics of wastewater treatment equipment in MBR membrane bioreactor;

1. Efficiently remove pollutants, ammonia nitrogen and refractory organic matter, and the treated water quality is good;

2, the sludge concentration is high, the surplus sludge output is low, the volume load of the equipment is large, and the occupied area is small;

3, it is beneficial to the interception of slow growth or efficient microorganisms, and improves the nitrification effect of the system and the treatment capacity of refractory organic matter;

4. High degree of automatic control and convenient operation and management;

5. The SS and turbidity of treated effluent are close to zero, which can be reused by adding reclaimed water recycling equipment.

6. The appearance of the equipment is made of steel structure and anticorrosive paint, so the whole equipment is durable, with a service life of more than 20 years.

7. This equipment is widely used, such as: urban sewage treatment and building water reuse, industrial wastewater treatment, micro-polluted drinking water purification, land landfill, fertilizer leachate treatment, fecal sewage treatment, etc.

Process characteristics of membrane bioreactor;

1, degrading the organic matter in the sewage, nitrifying Nspan-N into NO3- by nitrifying bacteria, and the removal rate of organic matter is over 95%; The ammonia nitrogen removal rate is above 97%.

2, the pretreatment process is simple, a large number of chemical agents are not needed, and the operation process is simple;

3. The recovery rate is high, and the recovery rate of water can reach over 99%. This flexibility allows the operator to reduce the "pressure" on the diaphragm by reducing the recovery rate when the quality of the inflow raw water deteriorates, but at the same time produce the same amount and quality of purified water;

4. The system adopts logical process monitoring system, including flow transmitter and pressure transmitter. This highly controlled system method can be used to design flexible systems and improve the low requirements for operator interface;

5. Air flushing ensures reliable operation under various inflow conditions;

6. Automatic backwashing ensures that the total membrane flux is improved at low membrane pressure;

7. The floor space is small, which is only10 ~ 20% of the traditional process;

8. Long service life, continuous running time up to 70,000 hours, and broken wire rate below 1%.

Disadvantages of MBR process:

1, the membrane cost is high, which increases the cost;

2. The membrane is easy to be polluted, which brings inconvenience to operation and management;

3. The energy consumption is slightly higher: firstly, a certain membrane driving pressure must be maintained in the MBR mud-water separation process; Secondly, the concentration of MLSS in MBR tank is very high, so to maintain sufficient oxygen transfer rate, the aeration intensity must be increased; In addition, in order to increase membrane flux and reduce membrane pollution, it is necessary to increase the flow rate and clean the membrane surface, which leads to the energy consumption of MBR being slightly higher than that of traditional biological treatment process.