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Processo e nuovo processo del bioreattore a membrana MBR

Tempo: 2020-04-16 Colpi: 42

Membrance Bioreactor Reactor (abbreviato in MBR) è un nuovo processo di trattamento biologico delle acque reflue composto da tecnologia di separazione a membrana e trattamento biologico.

 

There are many types of membranes, which are classified according to the separation mechanism, including reaction membranes, ion exchange membranes, and permeable membranes; according to the nature of the membranes, there are natural membranes (biological membranes) and synthetic membranes (organic membranes and inorganic membranes); Structural types are classified into flat type, tube type, spiral type and hollow fiber type.

 

Dagli anni '1980, i bioreattori a membrana hanno ricevuto sempre più attenzione e sono diventati uno dei punti caldi della ricerca. Attualmente, la tecnologia è stata utilizzata in più di dieci paesi come Stati Uniti, Germania, Francia ed Egitto, con una scala che va da 6 m3 / giorno a 13000 m3 / giorno.


 

La ricerca cinese sull'MBR dura meno di dieci anni, ma i progressi sono molto rapidi. La ricerca interna sull'MBR può essere approssimativamente suddivisa in diversi aspetti:

 

(1) Explore the combination of different biological treatment processes and membrane separation units. The biological reaction treatment process extends from the activated sludge method to the contact oxidation method, biofilm method, the combined benchtop process and two-phase combination of activated sludge and biofilm Anaerobic process;

 

(2) Research on factors, mechanisms and mathematical models that affect the treatment effect and membrane fouling, explore suitable operating conditions and process parameters, reduce membrane fouling as much as possible, and improve the processing capacity and operational stability of membrane modules;

 

(3) Expand the application scope of MBR. The research object of MBR expands from domestic sewage to high-concentration organic wastewater (food wastewater, beer wastewater) and refractory industrial wastewater (petrochemical wastewater, printing and dyeing wastewater, etc.), but the treatment of domestic wastewater is the Lord.

 

What are the characteristics of the MBR process?

 

Rispetto alla tradizionale tecnologia di trattamento biochimico dell'acqua, MBR ha le seguenti caratteristiche principali:

 

1. Efficient solid-liquid separation, the separation effect is much better than the traditional sedimentation tank, the effluent water quality is good, the effluent suspended matter and turbidity are close to zero, can be directly reused, realizing the recycling of sewage.

 

2. The high-efficiency interception function of the membrane allows microorganisms to be completely trapped in the bioreactor, achieving complete separation of the reactor hydraulic residence time (HRT) and sludge age (SRT), and the operation control is flexible and stable.

 

3. Since MBR combines the aeration tank and the secondary settling tank of traditional sewage treatment into one, and replaces all the process facilities of tertiary treatment, it can greatly reduce the area and save the investment in civil engineering.

 

4. Conducive to the interception and reproduction of nitrifying bacteria, the system has high nitrification efficiency. It can also have the functions of deamination and dephosphorization by changing the operation mode.

 

5. Since the mud age can be very long, the degradation efficiency of refractory organics is greatly improved.

 

6. The reactor is operated under high volume load, low sludge load and long sludge age. The remaining sludge output is extremely low. Since the sludge age can be infinitely long, in theory, zero sludge discharge can be achieved.