Method for treating poly butylene succinate production waste water by biochemical method

Abstract

The invention discloses a method for treating poly butylene succinate production waste water by a biochemical method. The method comprises the following steps of buffering in a water collecting tank, uniformly delivering to a homogeneity regulation tank of a sewage treatment station, mixing with plant domestic sewage in the homogeneity regulation tank, lifting to a neutralization reaction tank by a pump, adding lime milk while stirring, allowing a pH value of the waste water to be 6-9, allowing the waste water to flow automatically into a flocculation reaction tank, adding a PAC (polyaluminium chloride) flocculant constantly, allowing fine suspended substances and colloidal substances in the waste water to gather into alum floc with a larger particle size, conducting settlement separation in a settling tank, and allowing supernatant liquid in the settling tank to automatically flow into an A / O biochemical tank for reaction. The method is advanced, practical, mature and reliable in treatment process, requirements on water quality, water volume fluctuation and poor biodegradability can be met, and the treated waste water can be discharged up to a standard.

Description

technical field [0001] The invention mainly relates to a method for treating wastewater produced by a biochemical method, in particular to a method for treating wastewater produced by polybutylene succinate by a biochemical method. Background technique [0002] Fully biodegradable plastic polybutylene succinate (PBS) is a polymer polyester plastic with complete biodegradability, with succinic acid and butanediol as the main copolymerized main unit, PBS has good molding process Performance and excellent biodegradability, can be 100% decomposed into H2O and CO2 under natural conditions, is an internationally recognized environmentally friendly polymer. [0003] Using non-toxic and harmless succinic acid and butanediol as the main raw materials, through esterification and polycondensation reactions, the chain extension can be carried out at the same time in the later stage of the reaction to prepare high molecular weight fully biodegradable aliphatic polyesters. The wastewater...

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Problems solved by technology

[0007] ① Ordinary activated sludge process is an early application of sewage treatment process. Although the process has high treatment efficiency, it occupies a large area, is not resistant to impact loads, and is difficult to implement automatic control. In recent years, it is no longer used

[0008] ②Compared with the ordinary activated sludge method, the biological contact stabilization method greatly reduces the floor area and significantly improves the impact load resistance, but its power consumption is large, the treatment efficiency is low, the sludge output is large, and it does not have the function of denitrification

[0009] ③A / O method and A / A / O method have been widely used since the 1990s. They have good treatment effects, strong impact load resistance, and simultaneous denitrification and phosphorus removal. They are favored in urban sewage and industrial wastewater treatment. Has mature engineering operation and management experience, but in the existing specific engineering applications, there are many facilities and equipment, and the operation and operation are labor-intensive and costly

[0010] ④AB method, that is, two-stage activated sludge method, is mainly suitable for sewage treatment with large fluctuations in influent load or with a small amount of toxic substances. Restricted by other factors, this process is rarely used

[0013] ⑦ Biological aerated filter is a new process developed by combining the advantages of ordinary activated sludge method and biological contact oxidation method. This process has multiple purification functions of filtration, adsorption and biodegradation, and occupies less area and has high treatment efficiency. , simple operation and other advantages, but this process requires a large amount of special fillers, the cost is high, and it needs to meet the requirements of hydraulic load and organic load at the same time. Therefore, this process is currently mainly used in industrial wastewater treatment or sewage with high organic content and small scale. Advanced processing

[0018] ① Anaerobic microorganisms proliferate slowly, thus requiring a longer start-up and processing time

[0019] ②The effluent cannot directly meet the discharge standard, and the subsequent aerobic process is required

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