High speed water supply aerating biological filter and method for pretreating micro-polluted raw water using the same

Abstract

The invention discloses a high-speed water-supply biological aerated filter (BAF) and a method of applying the filter to pre-purify micro-contaminated raw water. The high-speed water-supply biological aerated filter comprises two UBAFs which are symmetrically arranged on two sides of a water distributing channel which is arranged on the upper part of a pipe rack where pipes are arranged. The water distributing channel comprises a general water-feeding channel, a first distributing channel, a second distributing channel, a strainer frame and a fixing grid provided with strainers. The micro-contaminated raw water pre-purifying method is as follows: the raw water enters a water distributing zone on the lower part of the filters after distributed and filtered by strainers, and then the water is distributed by filter heads and flows through a pebble bearing layer and a double-layer ceramsite filtering-material of the filters from bottom to top. The same-direction steam and water and the adoption of the double-layer light water-supply ceramsite filtering-material can delay the acceleration lost by the filter heads and provide the essential hydraulic conditions for the high-speed filtering and the collective adoption of a blast aeration system. The invention has high hydraulic load, low manufacturing cost and energy-conserving capability, and can guarantee the efficiency of purifyingorganisms and ammonia nitrogen. The invention is suitable for the biological pre-purifying to the micro-contaminated water supply.

Description

technical field [0001] The invention relates to the field of water supply pretreatment, in particular to a high-speed water supply aerated biological filter and a method for pretreating slightly polluted raw water using the same. Background technique [0002] Biological aerated filter is a new type of sewage treatment technology developed in the late 1980s. This technology uses granular fillers with high specific surface area as the biofilm carrier. The microbial biomass per unit body is large, the oxygen utilization rate is high, and the effluent The water quality is good, there is no need to set up a secondary sedimentation tank, the floor area is small, the energy consumption is low, and because of the modular structure, the degree of automation is high, the operation is reliable, and it is easy to manage. It has been widely used in sewage treatment at home and abroad. In recent years, due to the increasingly serious organic pollution of urban drinking water sources and t...

AI Technical Summary

Problems solved by technology

For slightly polluted raw water, although the biological pretreatment effect is very good, the head loss is relatively large when the high filtration rate is adopted in the stacked biological aerated filter, and the improvement of the filtration rate is limited, so its purification advantages cannot be fully utilized, and there is a further simplification of the process. Space

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