Plasticiser sewage treatment technique

Abstract

The invention discloses a plasticizer sewage treatment process. The process is characterized in that the sewage is treated according to the following steps: (1) degreasing through hydrolysis: heating up the wastewater on the alkaline condition to boil so as to make esters have hydrolytic reactions; and adding lime so as to make benzene ring substance react with calcium to generate deposition which is removed from the sewage; (2) neutralization: adding acid into the sewage to regulate the pH value of the wastewater to neutrality; (3) anaerobic treatment: on the anaerobic condition, breaking out the hardly degradable loops and converting the organisms into methane through the action of anaerobes; (4) aerobic treatment: carrying out the blast aeration of the sewage, and degrading the organisms through the action of aerobes; and (5) precipitation: separating the outputted aerobic water from the mud through a precipitation tank, discharging the supernatant, returning most of the sludge for aerobic treatment, and discharging a small amount of the sludge. The process occupies little space, requires no dilution, has low operation cost and stable emission up to the standards, and is competent for the qualified treatment of most plasticizer sewage.

Description

technical field [0001] The invention belongs to a sewage treatment process, in particular to a treatment process for plasticizer sewage. Background technique [0002] At present, the plastic industry in my country and the world is advancing by leaps and bounds, and plasticizers are the main components of plastic raw materials. From more than 100 in 2002 to nearly 10,000 in 2008, the amount of waste water produced by plasticizers is not large. It is about 100-200 tons / day, so the sewage treatment process produced by plasticizers is roughly similar, generally hydrolytic degreasing, neutralization and water distribution, anaerobic, sedimentation, conditioning, aerobic, contact oxidation and discharge. However, because this kind of sewage has a high concentration (more than 100,000 COD) and low BOD / COD (only 0.15), it is an extremely difficult biodegradable substance, so most factories use 5-10 times of tap water to dilute it for treatment. Cost is the price, and the process for...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects of the above-mentioned plasticizer sewage treatment process, such as large investment, high cost, large land occupation, and difficulty in meeting the third-level discharge (COD500) standard, the present invention provides a A plasticizer wastewater treatment process with a small footprint, no need for dilution, low operating costs, and stable up-to-standard discharge, to be able to meet the standard treatment of most of the plasticizer wastewater

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