Biological aerated filter and process

Abstract

The invention belongs to the technical field of environmental protection science and engineering, and in particular relates to a biological aerated filter for sewage treatment and a process. The biological aerated filter adopts a mode of two-stage series connection; a filter plate is arranged in the biological aerated filter; support layers are arranged on the filter plate; a first stage positioned above the support layers is provided with fillings; a second stage positioned above the support layers is provided with the fillings; an air pipe is arranged between the filter plate and the supportlayers; the upper part between the two stages of the biological aerated filter is provided with a water pore; the bottoms of the two stages of the biological aerated filter are provided with perforation spoil disposal pipes; a water inlet pipe is arranged at the lower part of the filter plate through the first-stage biological aerated filter; a back flush water inlet pipe and an outlet pipe are arranged at the lower part of the filter plate through the second-stage biological aerated filter, and a back flush outlet pipe is arranged at the upper part of the filter plate. The biological aeratedfilter has the process technology for sewage treatment with less land occupation, investment saving, low operating cost, high efficiency and convenient operation and management, and can be widely applied to the sewage treatment.

Description

technical field [0001] The invention belongs to the field of environmental protection science and engineering technology, and in particular relates to a biological aeration filter for sewage treatment and a process thereof. technical background [0002] Biological aerated filter is a new sewage treatment process developed on the basis of ordinary biological filter in the late 1980s and early 1990s. The biofilter has two notable features: one is that it has good particle filtration performance and bioaccumulation performance; the other is that due to the accumulation of biofilm, the filter needs to be backwashed in time to reduce excessive head loss. There are two kinds of common aerated biological filters in engineering according to the flow direction of water: 1. The Biocarbone downward flow biological filter developed by OTV company in France is characterized by the opposite direction of water flow and air flow, and downward flow of water. The air flow is upward; it is ea...

AI Technical Summary

Problems solved by technology

However, along the water inlet direction, due to the continuous reduction of organic matter and dissolved oxygen, the biomass is also continuously reduced, so the removal rate of organic matter is also continuously reduced, which greatly reduces the treatment efficiency of organic pollutants

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