Multi-stage refluxing load control biological process and matched facilities

Abstract

The invention provides a process of a multilevel reflux load control biological method and a device matched with the process. The process consists of a pretreatment process, a sludge multilevel load control treatment process and a post-treatment process of air flotation and so on. In the sludge multilevel load control treatment process, wastewater is treated through an integrated biological pond which consists of three sections of nine-level biological treatment ponds, the treatment process in the biological treatment pond comprises the following steps of: contact anaerobic treatments in the first level and the second level; intermediate precipitation in the third level; contact oxidation treatments in the fourth level and the fifth level; intermittent aeration in the sixth level; contact oxidation and addition of basic nutriment in the seventh level and the eighth level; and aeration precipitation in the ninth level. According to the situation of load, sludge in the integrated biological pond can be refluxed into each preceding biological pond so as to control activity, propagation, variation and other biological processes of microorganisms in the integrated biological pond. The integrated biological pond introduces an idea of modular design, and has the advantages of small occupied area, convenient construction, flexible regulation and control and low construction cost.

Description

technical field [0001] The invention relates to an industrial waste water treatment process and equipment, which is mainly used for textile printing and dyeing waste water treatment, and is a biological process and a corresponding process equipment system based on multi-stage sludge reflow and load control. Background technique [0002] The textile industry is a traditional pillar industry in my country. Its water consumption and drainage are relatively large. The annual wastewater discharge is about 900 million tons, ranking sixth in the "ranking list" of industrial wastewater. Textile wastewater mainly includes printing and dyeing wastewater, chemical fiber production wastewater, wool washing wastewater, hemp degumming wastewater and chemical fiber pulp wastewater. Printing and dyeing wastewater is the main source of pollution in the textile industry, accounting for about 80% of the wastewater discharge in the textile industry. [0003] Printing and dyeing wastewater refe...

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Problems solved by technology

Chinese patent literature CN1686862 (improved alternating activated sludge method sewage treatment process and its device), CN101045581 (sludge self-reflux aerobic biological treatment device), CN1255341C (a kind of biological denitrification and denitrification combined with activated sludge and biofilm Phosphorus treatment method), CN1412133, etc. all relate to the activated sludge return technology in the biological method. They each have their own characteristics, but there are also immature technologies, which are not suitable for high-concentration printing and dyeing containing macromolecular refractory organic substances, complex water quality, and high impact load. Wastewater is difficult to adapt to, resulting in the problem of non-standard discharge

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