German LEVAPOR process-perfect combination of moving bed biofilm reactor and biochar method阅读：19490 更新时间：2011-03-24 08:33 Source: State Environmental Protection Technology Co., Ltd. Guilin De Read: 19490 Updated: 2011-03-24 08:33
1. Introduction of moving bed biofilm reactor (MBBR) and process characteristics
The moving bed biofilm reactor has absorbed the advantages of the traditional activated sludge method and biological contact oxidation method, and has become a new and efficient composite process.
The filler with a large specific surface area in the reactor can move freely in the water due to stirring. When the sewage continuously passes through the reactor equipped with a moving filler, a biofilm is grown on the filler, and a large number of microorganisms multiply on the biofilm. C, N, P, etc. in the water undergo metabolism to play a role in purifying sewage.
The moving bed biofilm reactor belongs to a three-phase biological fluidized bed treatment method. The technical core of the moving bed biofilm reactor is a biological reaction tank with a unique structure using a unique carrier, which facilitates the circulation of microorganisms in the carrier and sludge.
Advantages of moving bed biofilm processes
Because the filler and water are moving, the mass transfer between gas, water, and solid phase is better. The biofilm on the filler has higher activity, which improves the organic load and efficiency of the system, and the quality of the effluent water is stable.
MBBR is more flexible in application, with various reactor shapes, compact structures, and small footprints, requiring only 20% of the volume of an ordinary oxidation tank under the same load conditions.
Small head loss, low energy consumption, simple operation, convenient operation and management.
The microorganisms adhere to the carrier and flow with the water stream, so no sludge reflux or circulating backwashing is required.
Biofilms fall off naturally without causing blockages.
Advantages of moving bed biofilm technology in municipal wastewater treatment
Small footprint: Under the condition of 15% filling rate and the same pollution load, the moving bed biofilm reactor occupies about 20-40% of the volume of the conventional bioreactor (hypoxia, anaerobic and aerobic). .
Suitable for the expansion of municipal sewage treatment plants: In view of the small reserved area of most sewage treatment plants, when the actual influent water quality and quantity change, the original designed water capacity can be met while maintaining the original designed tank capacity.
Suitable for the upgrading and reconstruction of existing sewage treatment plants: The design and operation of the moving bed biofilm process is flexible and simple, and it is suitable for different types of pools, and has strong compatibility with other processes, and can be compatible with most of the existing sewage treatment plant processes. Such as A2O, AO, SBR, CASS and oxidation trench method. Therefore, it is suitable for the upgrading and reconstruction of the existing sewage treatment plant, so that it can meet the level A or level B discharge standards.
The moving bed biofilm reactor not only has the characteristics of traditional biofilm method impact resistance load, long sludge age, less residual sludge, no sludge swelling phenomenon, but also the efficiency and flexibility of activated sludge method. On the other hand, the effect of temperature changes on the moving bed biofilm process is far less than the effect on the activated sludge process. When the temperature, sewage composition changes, or sewage toxicity increases, the tolerance of the moving bed biofilm reactor is very high. Strong.
2. Biochar Process (PACT)
Powdered activated carbon is added to the biochemical feedwater and the returned carbon-containing sludge is mixed in the aeration tank, and the remaining sludge discharged from the sludge concentration tank is sent to a sludge dewatering device. In the aeration tank, activated sludge is attached to the surface of powdered activated carbon. Due to the large specific surface area of powdered activated carbon and its strong adsorption capacity, the adsorption capacity of sludge is improved, especially at the interface between activated sludge and powdered activated carbon. Dissolved oxygen and degradation matrix concentrations have been greatly increased, which has also improved the COD degradation removal rate. Generally, in the PACT system, the dynamic adsorption capacity of activated carbon adsorption treatment of COD is 100% to 350% (weight percentage), that is, one kilogram of powdered activated carbon can adsorb and remove 1.0 to 3.5 kg of COD. Moreover, the PACT method can deal with toxic and harmful organic pollutants that are difficult to biodegrade.
3. LEVAPOR process-the perfect combination of MBBR process and PACT process
LEVAPOR? is the latest generation of high-efficiency microbial carrier for sewage and exhaust gas research and development developed by German LEVAPOR biofilm technology company. This new product combines the advantages of activated carbon and foaming materials, and has applied for patent protection in many countries. It has had very successful application cases in municipal sewage treatment plants and industrial sewage fields around the world.
Advantages of LEVAPOR process over competitors
Large specific surface area, up to 20000 m2 / m3
Filler filling rate is significantly reduced. Competitive products have a filling rate of 30% –70%, while LEVAPOR has a filling rate of only 10% -15%
The energy consumption is significantly reduced, and the energy consumption per ton of water is only 0.17 kWh
Easy to hang on the membrane, the microorganism can multiply and grow in the carrier within two hours
More effective absorption of toxic substances and substances that inhibit degradation, protecting biofilms
Better nitrification and denitrification, better nitrogen removal capacity
Results of pilot and large-scale applications of the LEVAPOR process and comparison with other suspended fillers
Start-up time is shorter. The effluent quality of the LEVAPOR process can be maintained within 3 weeks, while the use of other suspended fillers takes 2 months.
Under the condition that the volume ratio of the filler is 10%, the quality of the effluent water can be stably maintained at the first-level A standard, while the other types of suspended fillers can be added in the proportion of 30% -70% to achieve the same effect.
Benefits of using LEVAPOR moving bed biofilm reactor
Reconstruction and Expansion Projects-The maximum capacity of the existing facilities can be increased by 400%. Compared with other processes, the expansion and expansion costs are much lower, and the pipelines are less modified.
New facilities-Biofilm reactors using LEVAPOR suspension packing can increase biomass, the pool capacity is only about 20% of traditional activated sludge method, low investment cost, and can meet the requirements of environmental protection regulations for various indicators.