Adding microbial agents to the sewage treatment system

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1 Adding microbial agents to the sewage treatment system

After adding microorganisms to the sewage treatment system, it can grow and reproduce selectively and competitively with the original microbial populations in the sewage treatment system to realize the rearrangement of the population relationship and form a new dominant flora, thereby increasing the sewage treatment system The type and concentration of medium and high-efficiency microorganisms inhibit the growth of unfavorable bacteria and useless bacteria, improve sludge performance and metabolic activity, and achieve the purpose of sludge reduction
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The externally injected microorganisms can adapt to different types of sewage.
From the knowledge of sewage and native microbial populations, it is known that only the most suitable microorganisms can survive when they are put into the system
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For example: fat can not be used by microorganisms, but adding microorganisms that can produce lipase, fat can quickly decompose and form microbial tissue elements

In the Degan Wastewater Treatment Plant in Jiangjin District, Chongqing City, a productive experimental study of sludge reduction using multifunctional composite microbial agents (MCMP) was carried out
.

MCMP is a composite microbial preparation composed of high-efficiency denitrification and phosphorus removal bacteria, microorganisms that oxidize and decompose organic pollutants, and extremely salt-tolerant bacteria.

Another method to increase the concentration of microorganisms in the reaction tank-the biofilm method is also one of the sewage treatment technologies to reduce the yield of excess sludge
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The biofilm is fixed on the carrier filler to extend the sludge residence time and form a longer food chain composed of bacteria, algae, protozoa (such as rotifers) and metazoa (such as nematodes), which effectively reduces the amount of remaining sludge.

Another type of biofilm reactor that has been studied to reduce sludge production is the aerobic biological fluidized bed, which has a simple reactor structure, does not require sludge backflow, high microbial concentration, good fluid mixing performance, and good mass transfer effect.
Therefore, it has the advantages of high processing efficiency, large volume load, strong impact resistance, compact equipment, and less space.
Among them, the three-phase biological fluidized bed is more researched
.

The main feature of the three-phase biological fluidized bed is to use the coexistence of aerobic and anaerobic areas in the biofilm to achieve simultaneous removal of organic matter and nitrogen in the same reactor.

Sequencing batch moving bed biofilm reactor (MBSBBR) is used to treat simulated domestic sewage.
The biofilm is rich in microbial phases, forming a complex microbial ecosystem and low sludge yield
.

In addition, under low-temperature operating conditions, a comparative study of sludge reduction in the Sequential Batch Biofilm Process (SBBR), the Filler SBR Process and the Traditional Activated Sludge Process (CAS) process after the film has matured shows that the three processes The SBBR process has the lowest sludge yield, while the sewage treatment effect is the best

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