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Application areas of LEVAPOR biofilm technology

             阅读:4243 更新时间:2019-12-24 14:32 Source: State Environmental Protection Technology Co., Ltd. Guilin De Read: 4243 Updated: 2019-12-24 14:32

The unique properties of LEVAPOR biofilm carrier combined with modern biochemical technology can develop new and efficient processes to provide solutions for customers in different industries.
Unique reaction mechanism
The pore structure and high adsorption performance of LEVAPOR support provide a unique reaction mechanism in biochemical degradation, which can be reflected in the case of 2-chloro-benzylamine biodegradation:

The microbial flora was inhibited by 2-chloro-benzylamine using activated sludge method. By using LEVAPOR moving bed biofilm technology, 2-chloro-benzylamine was adsorbed on the carrier within 2 hours, and the toxicity in the liquid phase was greatly reduced, thereby ensuring that biochemical degradation can be quickly initiated. 2-chloro-benzylamine was degraded within 10 days, and the effect of biochemical degradation was characterized by the release of chloride ions. This mechanism indicates that the use of LEVAPOR biofilm carriers is faster than other types of carriers in engineering and can be more degraded.
These differences were confirmed in the small and medium tests conducted by the Technical University of Berlin, in which the university used washing wastewater for comparative tests. The volume load of COD is 2.3-2.9kgCOD / m3 d. The COD effluent of the device using the LEVAPOR carrier is the lowest. Subsequent pilot trials used only LEVAPOR vectors.
Higher nitrification efficiency when treating municipal wastewater:
The treatment capacity of the municipal sewage plant was increased from 43000m3 / d to 58000m3 / d. In order to improve the nitrification efficiency, a pilot test was carried out, and a comparative test was performed on the LEVAPOR carrier and the MUTAG carrier. LEVAPOR carrier has higher nitration efficiency than MUTAG carrier even under low dosage conditions, and the ammonia nitrogen has a lower effluent value.

Water treatment system for circulating aquaculture:
Circulating aquaculture refers to the high-density rearing of fish in indoor spaces under controlled conditions, not in outdoor ponds. This is an intensive farming method, with limited water and land space and almost completely controllable elements to achieve the goal of output.
The fish growing in this system need a continuous supply of clean water, especially the concentration of nitrous acid and ammonia nitrogen is required to be very low, because the concentration of nitrous acid to 0.5mg / L, the concentration of ammonia nitrogen to 1mg / L will be toxic to fish. effect.
The water treatment system filters and purifies the circulating water through the mechanism of nitrification and denitrification. The treatment device is a biological filter filled with LEVAPOR carrier, and the treated water flows into the fish pond again. A Polish company that is a leader in the fish breeding industry found in a pilot test that the biological filter filled with LEVAPOR carrier has the highest removal efficiency of total nitrogen (Figure 3), which can be attributed to the large adsorption area of LEVAPOR carrier. Due to the excellent results of the pilot test, the plastic material carrier used before was replaced by the LEVAPOR carrier with a lower filling rate. The energy consumption of the system after the carrier replacement for aeration and fluidization has been reduced.

Microorganisms multiply on the carrier faster and the project start-up time is shorter:
The specific surface area of common plastic materials is in the range of 500-1000m2 / m3, and the specific surface area of the LEVAPOR carrier can reach 1.3-1.6 106m2 / m3, which has extremely excellent ability to adsorb microorganisms. Microbes can multiply on the carrier and then accelerate the formation of biofilms. The chlorobenzene-degrading microbial flora can reproduce and grow within 150-200 minutes on the LEVAPOR carrier, while it takes several weeks on the plastic carrier (Figure 4).
In the anaerobic environment for the biodegradation of chlorobenzene compounds, the comparison of different types of carriers on the reproduction of microorganisms and the formation of biofilms was made. The amount of methane produced was used as a characterization of the reaction rate. Methane gas began to be produced after 3-4 weeks on the polyurethane foam, while the amount of methane gas produced on the LEVAPOR carrier at the same time period reached about 85% of the maximum amount (Figure 4).

The pulp and paper industry greatly reduces the volume of the reaction tank while maintaining a high degree of stability:
The results of the long-term pilot project show that the volume of the reactor for anaerobic treatment of toxic pulp wastewater can be reduced from the original 65,000 cubic meters (UASB anaerobic tank) to 18,000 cubic meters (biofilm reaction) when the LEVAPOR dosing rate is 12%. Device).
When the project was industrialized, one of the three reactors in the start-up phase had no loading body, and the activated sludge in the reactor was completely poisoned and lost its activity (mid-May), while the other two reactors were still operating normally.
Removal of ammonia nitrogen from refractory chemical wastewater:
An existing sewage treatment facility in a chemical plant requires biochemical treatment of ammonia and nitrogen. There are different technical options for achieving this goal. Due to space constraints, there is no way to expand sewage facilities. Considering the biological dynamics of nitrification, when the volume load of total nitrogen is greater than 0.6kgTKN / m3 d, putting a certain amount of LEVAPOR carrier in the reaction tank can establish a stable and effective nitrification process. After continuous operation, the scheme is indeed feasible (Figure 6).
LEVAPOR biofilm technology to treat high-salt industrial wastewater:
When the salinity is 50-60g / L, the limit of activated sludge treatment of saline wastewater is reached. In a pilot project for the treatment of pharmaceutical wastewater with salinity of 110-120g / L and COD75-120g / L, the domesticated microbial flora was immobilized on the LEVAPOR carrier, and the biofilm can also play a role in such harsh conditions .

When the salinity reaches 120g / L and the COD volume load is 2.0-2.5kgCOD / m3 d, the COD removal rate can reach 70-75%.
Improving biodegradability with LEVAPOR biofilm enhancement technology
By applying the reaction mechanism mentioned above, it is possible to improve the efficiency and stability of the biochemical degradation process, attach some special nutrients and micronutrients and metabolites to the carrier, and then let the treated organisms Membrane inoculation in the reactor can start biodegradation, so as to achieve the purpose of biological fortification.
The wastewater treatment facility of a petrochemical plant has not been able to effectively remove pyrazole in the past few years. The enhanced treatment biofilm was immobilized on a LEVAPOR carrier, and the results were satisfactory after several rounds of commissioning operation (Figure 8).

The domesticated solid-loaded microorganisms were placed in a 1.4m3 pilot plant as an inoculant, and the volume load was gradually increased. After 4-5 weeks, the removal rate of 300mg pyrazole / L d could be reached (Figure 9).

Biochemical treatment of waste gas from waste plastic storage facilities using trickle bed reactors:
The toxic gas generated in the warehouse that stores recyclable waste plastic contains high concentrations of Aspergillus niger and spore-producing microorganisms, which are harmful to human health and must be treated. But ordinary filtering facilities cannot effectively purify because the exhaust gas contains a large number of microorganisms. The exhaust gas from the biological trickle bed reactor containing LEVAPOR carrier can be effectively treated to meet the emission requirements and recycling. The use of this reactor reduces the energy consumption in winter because the amount of external circulating air required is reduced.
Figure 10 A trickle-bed reactor using LEVAPOR carrier to treat waste gas generated from warehouses that recycle plastic, with a gas volume of 15000m3 / hr

Table 3 Effect analysis of waste gas treatment using LEVAPOR trickle filter bed reactor




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