Improved A/O integrated sewage treatment process with four internal circulations

Abstract

The invention relates to an improved A / O integrated sewage treatment process with four internal circulations. The process comprises an anoxic area, an aerobic area, a clarifying area, a novel microporous aeration hose pipe, and other units. The novel microporous aeration hose pipe enables mixed liquid to flow from bottom to top in high-efficiency packing areas respectively arranged at the two sides of the middle part of the anoxic area and then enables the mixed liquid to flow from top to bottom from the two sides, and so on, so that the internal circulations at the two sides are formed, and simultaneous nitrification and denitrification can be further realized. The mixed liquid enters the aerobic area and is further subjected to aerobic degradation of organic matters and a nitration reaction by means of the novel microporous aeration hose pipe. The sludge and water mixed liquid can realize backflow in the same pipe from the tail end of the aerobic area to a water inlet end of the anoxic zone and a water inlet end of the aerobic zone, thus forming two internal circulations. The mixed liquid subjected to the aerobic degradation enters the clarifying area, so that solid-liquid separation and sludge concentration are realized; the clean water is discharged from a drainage pipe; the sludge slides down to the tail end of the aerobic area through an open sludge hopper at the bottom of the clarifying area, and the excess sludge passes through the bottom of the tail end of the aerobic area and is then discharged; therefore, the effect of phosphorus removal is achieved. The improvedA / O integrated sewage treatment process with four internal circulations is high in nitrogen removal and phosphorus removal efficient, low in energy consumption and less in sludge yield.

Description

technical field

[0001] The invention relates to a four-internal circulation improved A / O integrated sewage treatment process, which is suitable for sewage treatment in urban domestic sewage, scattered rural areas, remote areas and new districts outside the service area of ​​urban drainage systems, and specifically belongs to sewage treatment technology field. Background technique

[0002] With the rapid economic development, the problem of rural environmental pollution has become increasingly prominent. The amount of pollutants produced in rural areas has accounted for half of the country. my country has a rural population of 800 million, and produces more than 8 billion tons of domestic sewage every year. 96% of rural areas have no sewage treatment and collection systems, and 80% of village garbage is piled up on the roadside or even at water sources, flood troughs and ponds. This seriously endangers the safety of drinking water sources and affects the health of residents....

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