MBR is a kind of sewage treatment technics which combine Superfine filter components and bioreactor. Membrane separation plant hold back the activated sludge and macromolecule in biochemical reaction basin, omit secondary settling pond. the sludge depth greatly improved, HRT and SRT can separately control, the nonbiodegradable material constant reaction ,degradation in reactor. Membrane bio-reactor system greatly intensify the bioreactor function by membrane separation.
Membrane bioreactor (MBR) is the combination of a membrane process like microfiltration or ultrafiltration with a biological wastewater treatment process, the activated sludge process. It is now widely used for municipal and industrial wastewater treatment. When used with domestic wastewater, MBR processes can produce effluent of high quality enough to be discharged to coastal, surface or brackish waterways or to be reclaimed for urban irrigation. Other advantages of MBR over conventional processes include small footprint, easy retrofit and upgrade of old wastewater treatment plants.
It is possible to operate MBR processes at higher mixed liquor suspended solids (MLSS) concentrations compared to conventional settlement separation systems, thus reducing the reactor volume to achieve the same loading rate.
Two MBR configurations exist: internal/submerged, where the membranes are immersed in and integral to the biological reactor; and external/sidestream, where membranes are a separate unit process requiring an intermediate pumping step.
ecent technical innovation and significant membrane cost reduction have enabled MBR to become an established process option to treat wastewaters. As a result, the MBR process has now become an attractive option for the treatment and reuse of industrial and municipal wastewaters, as evidenced by their constantly rising numbers and capacity.
Membrane bioreactors can be used to reduce the footprint of an activated sludge sewage treatment system by removing some of the liquid component of the mixed liquor. This leaves a concentrated waste product that is then treated using the activated sludge process.
Compare to traditional activated sludge, MBR has the following advantage
1) 0.05 micro membrane filtering outlet water, the effluent water suspended solid and turbidity can close to zero, can be reuse directly.
2) Compare to traditional treatment system, it can save 50% land usable area;
4) The micro-organism concentration in bio-reactor can reach 5000-8000 mg/L, with high biochemistry efficiency, strong impact resistance.
5) System with high automation degree, adopt PLC control, can realize whole automatic control;
Influent and effluent water quality
|Item||Influent water quality||Effluent water quality|
|BOD5 (mg/L)||250-350|| <=10|
|Ammpnia nitrogen||50 mg/L||20 mg/L|
|Oil grease||30-40 mg/L||No|
Main treatment unit:
Install Manual screen or mechanical bar screen in the screen channel,they can remove large particles in the waste water,such as plastic bag,Pericarp,Remnant,etc.
This tank is used to adjust the wastewater quantity and quality in different time,make sure the inffluent water have the same quality,which will better for the following treatment.
The anoxia tank use anaerobic bacteria to hydrolysis, acidate and methanated the COD and BOD. Remove organic matter in waste water, and improve the biodegradability of sewage, is conducive to the subsequent aerobic treatment.
4.MBR bio-reaction tank
MBR bio-reaction tank and aerobic tank can be combined together.The role of aerobic tank is to make activated sludge to take on aerobic respiration,further decomposition of organic matter into inorganic matter.MBR bio-reaction tank trap activated sludge and other matters,clean water will be suck out by sucking pump.
there are set sludge collecting hopper and sludge pipeline in sludge tank bottom, in order to convenient for sludge concentration, set weir water tank in top, there open mud discharge inlet in bottom, rely on static pressure automatic discharge mud.
4.Cleaning water tank
Function and application scope
1).Already existing sewage treatment plant,running water factory upgrade,reform
2).Municipal sewage treatment plant,running water factory new instruction
3).pure water production pretreatment
4).Reuse of reclaimed water
1).Hotel,restaurant,community etc domestic sewage treatment recycle
2).Industrial and mining enterprises,remote village,sentry ,tourist area etc domestic sewage recycle.
3).Each kind of industrial sewage (similar to domestic sewage) :such as hospital sewage,pharmaceutical sewage ,washing sewage,food sewage etc.