Pesticide wastewater treatment system and treatment process

Abstract

The invention discloses a pesticide wastewater treatment system which is characterized by comprising an adjusting pond, a coagulative precipitation tank, an anaerobic pool, an aerobic tank, a secondary sedimentation tank, a buffer tank, a material conveying pump, a tubular ultrafiltration membrane, an ultrafiltration water yielding tank, a first pressurizing pump, a second pressurizing pump, a high pressure nanofiltration membrane, a catalytic oxidizing device, a secondary aerobiotic tank and the like. The invention also provides a pesticide wastewater treatment process. The treatment system and the treatment process disclosed by the invention for pesticide wastewater treatment can realize the condition that the pesticide wastewater reaches a national first-level discharge standard and recovery of part of the pesticide wastewater. Meanwhile, by adopting the tubular ultrafiltration membrane and the high pressure nanofiltration assembly, the system has the advantages that effluent of the secondary sedimentation tank needs not to be pre-treated (for example, coagulating sedimentation, multi-media filtration and the like), the system is stable to operate and the water yield is great, the cleaning period is long and the like.

Description

technical field [0001] The invention relates to the field of pesticide wastewater treatment, in particular to a pesticide wastewater treatment system and a treatment process. Background technique [0002] Pesticides have played a vital role in agricultural production and strongly promoted the development of modern agriculture. However, a large amount of pesticide wastewater will be produced during the production of pesticides. According to incomplete statistics, the national pesticide industry discharges about one billion tons of pesticide wastewater every year, of which the treatment rate of pesticide wastewater is less than 10%, and only 10% of the pesticide wastewater reaches the standard. The percent processed. [0003] Pesticide wastewater has the following characteristics: 1) The concentration of organic matter is high, the COD index of the effluent fluctuates greatly and the content of suspended solids is high; 2) The pollutant composition is complex and contains a l...

AI Technical Summary

Problems solved by technology

However, a large amount of pesticide wastewater will be produced during the production of pesticides. According to incomplete statistics, the national pesticide industry discharges about one billion tons of pesticide wastewater every year, of which the treatment rate of pesticide wastewater is less than 10%, and only 10% of the pesticide wastewater reaches the standard. percent processed

However, since the produced water from the secondary sedimentation tank directly enters the air flotation tank and the catalytic oxidation device for advanced oxidation, the load on the catalytic oxidation device is greatly increased. At the same time, due to the complex composition and high salt content of the pesticide wastewater, it is still difficult for the treated pesticide wastewater to reach the national level. Level 1 Emission Standard

At present, there are also pesticide wastewater treatment processes combined with related membrane devices, but at the same time, it is generally difficult to obtain reasonable and stable long-term use due to problems such as difficult pretreatment and high energy consumption.

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