Method for treating container washing wastewater

Abstract

The invention relates to a method for treating container washing wastewater, comprising the pretreatment, physical and chemical treatment, biochemical treatment and advanced treatment, wherein the pretreatment comprises the step of filtering suspended matter and oil slick out by an oil separation tank and a collected water regulating reservoir so as to homogenize water quality and water quantity; the physical and chemical treatment comprises the step of removing oil substances and COD by an air flotation device; the biochemical treatment comprises the step of removing hazardous and noxious substances by an AF anaerobic filter chamber and an SBR reaction tank; and the advanced treatment comprises the steps of degrading organic matters and sterilizing by a moving bed biomembrane reactor and an ozone catalyzing oxidation pond, wherein the treated wastewater serves as washing water after reaching normal water reuse standards. The invention not only treats the container washing wastewater containing oil, poisonous substances and organic hazardous chemicals into clear water meeting the national discharging standards and discharging standards in Tianjin, but also reduces the content of the suspended matters and oils, and saves water resources because the clear water after being treated can serve as the reuse clear water.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, in particular to a treatment method for container washing waste water. Background technique [0002] With the development of the world economy, trade globalization has become an irreversible trend, and the container transportation business has continued to expand, which has promoted the development of import and export trade, but at the same time it has also brought about the problem of mutual pollution of container transportation goods. Especially for containers that carry toxic and dangerous goods and chemicals, the waste water produced during the cleaning process has complex components and contains toxic and harmful substances. If it is not handled properly, it will pose a threat to the environment and human health. [0003] The main characteristics of the waste water produced by cleaning and shipping toxic and dangerous goods and chemical containers are: [0004] ① The composit...

AI Technical Summary

Problems solved by technology

[0004] ① The composition of tank washing wastewater is complex, and the water quality changes greatly;

This method removes toxic and harmful substances, and the main pollutant indicators of the treated effluent meet the national "Wastewater Comprehensive Discharge Standard" GB8978-1996 secondary discharge standard, but its suspended solids and oil content indicators are higher than Tianjin Municipal Discharge Standards