Chemical industry wastewater comprehensive treatment method

Abstract

The invention relates to a chemical industry wastewater comprehensive treatment method which comprises a pretreatment system, a primary biochemical system, an ozone treatment system, a secondary biochemical system and an after-treatment system. By adopting the two biochemical treatment systems, the iron carbon treatment system is arranged before the primary biochemical treatment system, and the ozone treatment system is arranged between the two biochemical treatment systems so as to greatly enhance the biodegradability of the wastewater, so that the treated wastewater can satisfy the direct discharge requirement. The method is suitable for comprehensive treatment of various types of chemical industry wastewater, has the advantages of low treatment cost, high technical stability, high pollutant removal rate, stable and standard effluent water quality and the like, and is suitable to be widely used in chemical industry wastewater treatment.

Description

technical field

[0001] The invention belongs to the technical field of environmental protection and relates to a wastewater treatment technology, in particular to a comprehensive treatment method for chemical wastewater. Background technique

[0002] With the development of the chemical industry, chemical products are diverse and complex in composition. Chemical wastewater is the process wastewater, cooling water, waste washing water, equipment and site washing water and other wastewater discharged in chemical production. Its harm to the environment and its treatment measures mainly depend on the characteristics of chemical wastewater. The characteristics of chemical wastewater are mainly characterized by complex water quality components, many types of pollutants, high BOD and COD, many toxic and harmful characteristic pollutants, high temperature and chromaticity. Chemical wastewater, especially petrochemical wastewater, contains various organic acids, alcohols, aldehydes...

Examples

Embodiment 1

[0049] refer to figure 1 , a method for comprehensive treatment of chemical wastewater, comprising the steps of:

[0050] (1) Pre-treatment system: Wastewater enters the regulating tank, is pumped into the iron-carbon reaction tank by the lift pump, and the pH is controlled to be 3 to 4, and the iron-carbon micro-electrolysis reaction is carried out, and the iron-carbon reaction tank is stirred with compressed air; the reaction takes 2.5 hours Finally, the wastewater flows to the first coagulation tank by itself, and the pH is adjusted to 8-9 by liquid alkali with a mass concentration of 25%, and polyaluminum coagulant (PAC) and polyacrylamide (PAM) precipitant are added, and the precipitated sludge enters The sludge concentration tank is concentrated and then filtered to remove water; among them, the dosage of polyaluminum coagulant is 3‰ of the wastewater volume, the concentration of polyacrylamide is 3.5g / L, and the dosage is 1.5% of the wastewater volume ‰;

[0051] (2) ...

Embodiment 2

[0057] A method for comprehensive treatment of chemical wastewater, comprising the steps of:

[0058] (1) Pre-treatment system: Waste water enters the regulating tank, and is pumped into the iron-carbon reaction tank by the lift pump, and the pH is controlled to be 2 to 3, and the iron-carbon micro-electrolysis reaction is carried out, and the iron-carbon reaction tank is stirred with compressed air; after 1 hour of reaction , the wastewater flows to the first coagulation tank by itself, and the pH is adjusted to 7-8 by the liquid alkali with a mass concentration of 10%, and polyiron coagulant and polyacrylamide precipitant are added, and the precipitated sludge enters the sludge thickening tank to concentrate and then Perform pressure filtration to remove water; wherein, the dosage of polyferric coagulant is 1.5‰ of the wastewater volume, the concentration of polyacrylamide is 1.5g / L, and the dosage is 1.5‰ of the wastewater volume;

[0059] (2) First-level biochemical system...

Embodiment 3

[0065] A method for comprehensive treatment of chemical wastewater, comprising the steps of:

[0066] (1) Pre-treatment system: Wastewater enters the regulating tank, and is pumped into the iron-carbon reaction tank through the lifting pump, and the pH is controlled to be 4-5, and the iron-carbon micro-electrolysis reaction is carried out, and the iron-carbon reaction tank is stirred with compressed air; after 3 hours of reaction , the wastewater flows to the first coagulation tank by itself, the pH is adjusted to 8-9 by the liquid alkali with a mass concentration of 30%, and polyferric coagulant and polyacrylamide precipitant are added, and the precipitated sludge enters the sludge thickening tank to concentrate and then Press filtration to remove water; wherein, the dosage of polyferric coagulant is 5‰ of the wastewater volume, the concentration of polyacrylamide is 5g / L, and the dosage is 2‰ of the wastewater volume;

[0067] (2) First-level biochemical system: after the fi...

technical field

[0001] The invention belongs to the technical field of environmental protection and relates to a wastewater treatment technology, in particular to a comprehensive treatment method for chemical wastewater. Background technique

[0002] With the development of the chemical industry, chemical products are diverse and complex in composition. Chemical wastewater is the process wastewater, cooling water, waste washing water, equipment and site washing water and other wastewater discharged in chemical production. Its harm to the environment and its treatment measures mainly depend on the characteristics of chemical wastewater. The characteristics of chemical wastewater are mainly characterized by complex water quality components, many types of pollutants, high BOD and COD, many toxic and harmful characteristic pollutants, high temperature and chromaticity. Chemical wastewater, especially petrochemical wastewater, contains various organic acids, alcohols, aldehydes...

Examples

Embodiment 1

[0049] refer to figure 1 , a method for comprehensive treatment of chemical wastewater, comprising the steps of:

[0050] (1) Pre-treatment system: Wastewater enters the regulating tank, is pumped into the iron-carbon reaction tank by the lift pump, and the pH is controlled to be 3 to 4, and the iron-carbon micro-electrolysis reaction is carried out, and the iron-carbon reaction tank is stirred with compressed air; the reaction takes 2.5 hours Finally, the wastewater flows to the first coagulation tank by itself, and the pH is adjusted to 8-9 by liquid alkali with a mass concentration of 25%, and polyaluminum coagulant (PAC) and polyacrylamide (PAM) precipitant are added, and the precipitated sludge enters The sludge concentration tank is concentrated and then filtered to remove water; among them, the dosage of polyaluminum coagulant is 3‰ of the wastewater volume, the concentration of polyacrylamide is 3.5g / L, and the dosage is 1.5% of the wastewater volume ‰;

[0051] (2) ...

Embodiment 2

[0057] A method for comprehensive treatment of chemical wastewater, comprising the steps of:

[0058] (1) Pre-treatment system: Waste water enters the regulating tank, and is pumped into the iron-carbon reaction tank by the lift pump, and the pH is controlled to be 2 to 3, and the iron-carbon micro-electrolysis reaction is carried out, and the iron-carbon reaction tank is stirred with compressed air; after 1 hour of reaction , the wastewater flows to the first coagulation tank by itself, and the pH is adjusted to 7-8 by the liquid alkali with a mass concentration of 10%, and polyiron coagulant and polyacrylamide precipitant are added, and the precipitated sludge enters the sludge thickening tank to concentrate and then Perform pressure filtration to remove water; wherein, the dosage of polyferric coagulant is 1.5‰ of the wastewater volume, the concentration of polyacrylamide is 1.5g / L, and the dosage is 1.5‰ of the wastewater volume;

[0059] (2) First-level biochemical system...

Embodiment 3

[0065] A method for comprehensive treatment of chemical wastewater, comprising the steps of:

[0066] (1) Pre-treatment system: Wastewater enters the regulating tank, and is pumped into the iron-carbon reaction tank through the lifting pump, and the pH is controlled to be 4-5, and the iron-carbon micro-electrolysis reaction is carried out, and the iron-carbon reaction tank is stirred with compressed air; after 3 hours of reaction , the wastewater flows to the first coagulation tank by itself, the pH is adjusted to 8-9 by the liquid alkali with a mass concentration of 30%, and polyferric coagulant and polyacrylamide precipitant are added, and the precipitated sludge enters the sludge thickening tank to concentrate and then Press filtration to remove water; wherein, the dosage of polyferric coagulant is 5‰ of the wastewater volume, the concentration of polyacrylamide is 5g / L, and the dosage is 2‰ of the wastewater volume;

[0067] (2) First-level biochemical system: after the fi...

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