Integral air-lift circumfluent suspended filler dispersed sewage biological treatment device

Abstract

The invention belongs to the technical field of environmental engineering sewage treatment, and in particular relates to an integral air-lift circumfluent suspended filler dispersed sewage biological treatment device. The device integrates four functional units, which respectively are an anoxia biological regulation tank, a suspended filler biological reaction tank, a secondary sedimentation tankand a mud storage tank. The round vertical flow type secondary sedimentation tank is arranged at the middle part of a reactor, other three functional units are located around the central secondary sedimentation tank in radiating way, and the appearance of the entire device is in cylindrical structure. Rural dispersed domestic sewage enters into the anoxia biological regulation tank uniformly through a pipeline, is subject to hydrolyzation and acidification, lifted into the suspended filler biological reaction tank by a sewage air-lifter, spherical suspended filler with filling ratio of 40-50%is thrown in the suspended filler biological reaction tank, enters into the central secondary sedimentation tank through a barrier mesh at the drain hole, sediment water and mud are separated, mud iscollected by a triangular-notch weir and water is discharged via a water collecting sump. Nitrification liquid in the suspended filler biological reaction tank reflows into the anoxia biological regulation tank via a nitrification liquid air-lifter for denitrification by utilizing influent organic carbon source. Sediment mud in the secondary sedimentation tank enters into the mud storage tank viaa mud air-lifter, and the mud drainage period is long. The invention utilizes the anoxia biological regulation tank to achieve functions of removing organic substances and denitrifying; the compact integral structure occupies a small area of land; system equipments are few, thus investment and running cost are little; the invention is suitable for rural dispersed domestic sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an integrated airlift circulation suspended filler dispersed sewage biological treatment device. Background technique [0002] my country has a total of 3.207 million natural villages, 634,000 administrative villages, 22,000 market towns, and nearly 20,000 official towns. According to statistics, the drainage volume of counties, towns, and villages in my country currently accounts for about 50% of the total drainage volume of the country. However, 96% of villages and towns do not have drainage channels and sewage treatment systems, and the sewage treatment rate in counties is only about 11%. More than 1%, a large amount of production and domestic sewage are discharged randomly, causing serious pollution of surface and underground water sources in small towns and rural areas, not only accelerating the eutrophication process of rivers, lakes, reservoirs and other...

AI Technical Summary

Problems solved by technology

However, for the decentralized domestic sewage treatment in rural areas, there are some deficiencies in the relevant suspended packing bed patents: ① The degree of integration and intensification is not high, the land occupation is large, and the waste of processing or construction materials is large

Moreover, the pretreatment system and the sludge treatment system are free from the main treatment system, such as a kind of integrated sewage suspension carrier treatment process whose publication number is CN1843981A; Bed biochemical denitrification and phosphorus removal methods involve sewage lifting pumps, excess sludge pumps, return pumps, blowers, mixers, scraper suction machines, and dosing systems, resulting in large system investment and complicated operation and process control; ③ using pumps to lift , easy to block, requires liquid level control, complicated maintenance process

At the same time, it is difficult to select a lift pump with a small flow rate; ④ The sludge treatment is not considered, and the sludge management is troublesome

The above problems limit the application of suspended packed bed technology in rural decentralized sewage treatment

Images