Zeolite-activated carbon compound filter material adopting cascade biofilter water treatment system and treatment process

Abstract

The invention discloses a zeolite-activated carbon compound filter material adopting cascade biofilter water treatment system and a treatment process. The system comprises a grille well, a domestic sewage regulation tank, a primary compound filter material adopting biofilter, a secondary compound filter material adopting biofilter and a clean water tank. The grille well is communicated with the domestic sewage regulation tank which is communicated with the primary compound filter material adopting biofilter, and the primary compound filter material adopting biofilter is communicated with the secondary compound filter material adopting biofilter, and an outlet of the secondary compound filter material adopting biofilter is connected with an inlet of the clean water tank. The primary compound filter material adopting biofilter and the secondary compound filter material adopting biofilter both adopt zeolite and activated carbon as filter media. By adoption of the zeolite-activated carbon compound filter materials for strong absorption of ammonia nitrogen and organics and adoption of biological membranes for degradation of the organics, regeneration of the zeolite-activated carbon compound filter materials is realized, and the organics are removed effectively through two processes of adsorption and degradation.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a new type of high-efficiency thermal power plant domestic sewage treatment process, in particular to a zeolite-activated carbon composite filter material cascade biological filter water treatment system and treatment process. Background technique [0002] The domestic sewage in the thermal power plant mainly comes from the office area, canteen, bathroom and other places in the plant. It is characterized by a small average flow rate and a small amount of pollutants. Biochemical indicators such as COD and ammonia nitrogen do not meet the national "Comprehensive Discharge Standards for Pollutants" (GB8978-1996), other indicators are basically the same as raw water, so domestic sewage is usually treated and reused to power plant circulating water or other industrial water systems. The traditional domestic sewage treatment process of thermal power plants is biological contact ox...

AI Technical Summary

Problems solved by technology

The traditional domestic sewage treatment process of thermal power plants is biological contact oxidation or aerated biological filter process. The biological contact oxidation tank has a large area, slow flow rate, microbial film formation is greatly affected by temperature, maintenance is difficult, and methane is easy to produce harmful factors such as gas, are not successfully run in most power plants

The biological aerated filter treatment process has the disadvantages of long time-consuming film formation, slow microbial growth, high requirements for SS in the influent, easy drift accumulation of the filter material during backwashing, poor sludge stability, large head loss, and filter material flushing during backwashing. Insufficient water is prone to problems such as agglomeration. These shortcomings cause the effluent quality of the biological aerated filter system to be poor after a period of operation, and cannot meet the discharge or reuse requirements

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