Method for processing and recycling wastewater containing fluorine, chromium ion

Abstract

The invention discloses a wastewater treatment and recycling technology for aluminum profile production enterprises. According to different pollutants, the wastewater produced by the aluminum profile production enterprises can be divided into three types to be treated: chromium-containing wastewater, high fluorine-containing wastewater and low fluorine-containing wastewater. The three types of wastewater carry out classification treatment and splitting treatment: (1) the chromium-containing wastewater is secondarily processed to remove hexavalent chromium and other harmful impurities; the processed water can be 100 percent recycled; (2) most of the fluorine and aluminum in the high fluorine-containing wastewater can be removed by coagulation precipitation method; part of the first treated wastewater can be recycled and used in the related process which has low requirement to the quality of water; other wastewater is secondarily processed by adopting composite of modified activated carbon and modified zeolite to further remove the fluorine and chemical oxygen demand COD; then part of the wastewater is recycled and the other part achieved standard is discharged; (3) most of the aluminum in the low fluorine-containing wastewater is removed by neutralization precipitation method; then the wastewater is secondarily processed by adopting the composite of the modified activated carbon and the modified zeolite to further remove the pollutants in the wastewater; the wastewater can be all recycled.

Description

Technical field: [0001] The invention relates to the technical field of waste water treatment of aluminum profile production enterprises, in particular to 100% treatment and reuse of chromium ion-containing waste water, using modified activated carbon and modified zeolite to compound secondary treatment of aluminum profile production waste water, and removing waste water A treatment and recovery method for waste water containing fluorine and chromium ions, in which fluorine and chemical oxygen demand (COD) are reused. Background technique: [0002] my country's per capita water resources are far below the world average, so saving and protecting water resources is particularly important. The "National Environmental Protection Eleventh Five-Year Plan" issued on November 22, 2007 clearly requires that by 2010, the total national chemical oxygen demand (COD) emissions will be reduced by 10% compared with 2005, from 14.14 million tons in 2005 to 12.7 million tons in 2010, the to...

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Problems solved by technology

It should be pointed out that the content of various pollutants in the treated wastewater was not found in this report, and the full text did not involve the content indicators of chromium and chemical oxygen demand (COD). In addition, this article was published in 2001, so far no relevant applications have been seen.

[0009] To sum up, at present, my country, especially Guangdong Province, has a large production scale of aluminum profiles, occupies a large amount of water resources and discharges waste water, but the reuse of related waste water has not been applied on a large scale. It is urgent to carry out this project, which has wide application value and Research on key technologies of recycling wastewater from aluminum profile production for social effects