A biofilm pretreatment device suitable for the purification of polluted raw water

Abstract

The invention provides a biofilm pretreatment device for polluted raw water purification. The reactor main body is provided with a water inlet pipe, an inlet water drainage area, a sediment sedimentation area, a dredge pipe, a separation net, a hung filler area, a suspension filler area, an elastic filler, a combined filler, a suspension filler, a suspended matter blocking screen, a splitter plate, a drainage plate, a treatment unit, a downstream diversion area, an aeration pipe, an elastic filler zone, an overflowing net and a water outlet pipe. Through combination of different types of fillers and distribution methods, a microbial biofilm attachment environment and microbial type diversity are improved. The biofilm pretreatment device is conducive to systematical, economic and effective removal of nitrogen and organic matters in raw water and reduction of turbidity of the raw water, breaks the limit of biological aeration tank carrier density close to that of water, solves the problem that the suspended biofilm carrier is not easily deposited on the bottom of the reactor and cannot fully perform cleaning effects, improves pollutant removal efficiency, effectively reduces an aeration cost and a running cost of the later raw water treatment process, and reduces a potential disinfection by-product generation risk.

Description

technical field [0001] The invention relates to a biofilm pretreatment device suitable for purifying polluted raw water, belonging to the technical field of raw water biological pretreatment. Background technique [0002] In recent years, with the aggravation of water pollution, the raw water used for tap water treatment has been seriously polluted, and the situation has become increasingly severe. Ammonia nitrogen, organic matter, and turbidity are the main pollutants that pollute raw water. Traditional biological pretreatment techniques include coagulation, sedimentation, filtration, and disinfection. However, the traditional biological pretreatment process cannot effectively remove pollutants in raw water economically and efficiently during the treatment process. Among them, for ammonia nitrogen and dissolved organic matter, the traditional pretreatment process is difficult to deal with, and disinfection by-products are easy to be produced in the subsequent disinfection ...

AI Technical Summary

Problems solved by technology

Aerobic biological aeration tanks usually use a single suspended filler film to carry out biological treatment of raw water under high aeration conditions (almost close to saturated DO level), but due to the large aeration agitation range, not only cannot effectively remove turbidity and COD in raw water Mn , resulting in a single habitat for biofilm operation and increased aeration costs; in addition, the density of suspended fillers in biological aeration tanks is required to be relatively close to the density of water, because the growth of biofilms tends to sink to the bottom of the tank and cannot play a role

Once subjected to load impact or long-term operation at low temperature, it is difficult to maintain long-term stable performance

However, the biofilter carrier has been covered for several months, and it is difficult to start and is limited by the low porosity of the carrier. The large water resistance limits the flow of water and easily causes system blockage, which increases the cost of backwashing. The high frequency of backwashing will easily delay the normal operation of the water plant and increase the difficulty of daily management and maintenance

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