Sequence fed-batch reactor and biological aerated filter (SFBR-BAF) biological nitrogen and phosphorus removal technology

Abstract

The invention discloses a sequence fed-batch reactor and biological aerated filter (SFBR-BAF) biological nitrogen and phosphorus removal technology. The SFBR-BAF biological nitrogen and phosphorus removal technology comprises carbon removal, nitrogen removal, and nitrogen and phosphorus removal, and concretely comprises that in a reaction period, sewage is continuously added into an activated sludge reaction tank, the environment of a front SFBR reaction tank is orderly set into an aerobic state and an anaerobic state, the supernatant is discharged by one step after solid-liquid separation in a static settlement stage, and the discharged supernatant is fed into a back improved BAF device, then is treated orderly by an anaerobic section and an aerobic section of the BAF device and then is discharged. The SFBR-BAF biological nitrogen and phosphorus removal technology realizes a good microbe growth environment, solves the problem that high-concentration salts in waste water damage microbes or inhibit microbe growth, solves the problem of mutual inhibition and carbon source contending of microbe mixed culture, solves the problem of BAF biological filter material blocking caused by high-concentration SS, improves a wastewater biotransformation rate, improves total nitrogen and phosphorus removal effects, improves an oxygen utilization rate, and reduces energy consumption and a production cost.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a biological treatment method for nitrogen and phosphorus removal of urban sewage and domestic sewage. Background technique [0002] A large amount of nitrogen and phosphorus in sewage are discharged into water bodies, which is the main cause of eutrophication in rivers and lakes. Due to the pollution of nitrogen and phosphorus in my country's surface water bodies and offshore watersheds, eutrophication frequently occurs in large areas, which leads to stinky surface water bodies, overgrown algae, and aquatic organisms are on the verge of extinction, causing huge economic losses. To this end, the state has taken positive measures to formulate strict wastewater nitrogen and phosphorus discharge standards. For example, my country's current "Pollutant Discharge Standards for Urban Sewage Treatment Plants (GB18918-2002)" puts forward higher requirements for nitrogen and phos...

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Problems solved by technology

[0008] At the same time, the SBR process also has its defects: (1) The one-time water intake method is difficult to ensure the optimal substrate concentration or growth environment required for microbial growth, especially when the wastewater contains substances that are harmful or inhibit microbial growth. Such as high concentration of ammonia nitrogen and salt, high initial concentration is unfavorable to microbial growth or biochemical reactions, prolongs the start-up time of microbial reactions, and reduces the degradation efficiency of organic matter

(2) Wastewater characteristics such as substrate concentration, COD / N ratio, and pH value have an important impact on the growth rate of microorganisms, and high concentrations of NH 4+ , NO 2－ Both will inhibit the growth of nitrifying bacteria, the system has poor impact resistance, and the one-time feeding method is difficult to maintain the optimal environment required for microbial growth. The COD / N ratio and its concentration in wastewater, and the microbial concentration have a significant impact on COD and N removal rates , In addition, the different ways of water intake in the SBR process directly affect the sedimentation performance

[0009] Biological Aerated Filter (BAF for short) is an excellent technology for advanced sewage treatment, but one of the disadvantages of this process being directly used in urban sewage treatment is that the SS in raw water is required to be lower than 100mg / L. It is best that SS is lower than 60mg / L, otherwise when this process is used to directly treat urban sewage, the biological filter will be blocked and cannot operate normally

Another problem is that the biofilter tank filler also has problems in terms of economy, biofilm, and backwashing.

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