Compound oxidant for advanced treatment of electroplate phosphorate wastewater and wastewater treatment method

An advanced treatment and oxidant technology, which is applied in the direction of oxidized water/sewage treatment, metallurgical wastewater treatment, water/sludge/sewage treatment, etc., can solve the problems of poor phosphorus removal effect, achieve good oxidation effect, avoid adverse effects, and realize Effects of Environmental Benefits and Social Benefits

Active Publication Date: 2014-10-01
NANJING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims at the problems such as poor phosphorus removal effect existing in the treatment process of electroplating phosphorus-containing wastewater, and provides a compound oxidant and wastewater treatment method for advanced treatment of electroplating phosphorus-containing wastewater. The total phosphorus content in the treated effluent is stably reduced to below 0.2mg / L, which provides an important guarantee for the advanced treatment of high-concentration electroplating phosphorus-containing wastewater, thus realizing the unity of environmental and social benefits

Method used

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  • Compound oxidant for advanced treatment of electroplate phosphorate wastewater and wastewater treatment method
  • Compound oxidant for advanced treatment of electroplate phosphorate wastewater and wastewater treatment method
  • Compound oxidant for advanced treatment of electroplate phosphorate wastewater and wastewater treatment method

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Embodiment 1

[0041] combined with figure 1 , a compound oxidant and wastewater treatment method for advanced treatment of electroplating phosphorus-containing wastewater in this embodiment is especially suitable for treating electroplating phosphorus-containing wastewater with high non-orthophosphate content. The steps are:

[0042] (A) Control electroplating phosphorus-containing wastewater to enter the pH adjustment tank. In this experiment, the electroplating phosphorus-containing wastewater in this example has a total phosphorus content of 54.3 mg / L, an orthophosphate content of 8.54 mg / L, and a pH of 4. Using 30% sodium hydroxide stock solution to adjust the pH of wastewater to 9;

[0043] (B) The effluent obtained in step (A) is entered into the oxidation reaction contact tank, and a metering pump is used to add three kinds of solution oxidants of chlorine dioxide, hydrogen peroxide and sodium hypochlorite simultaneously, and an aeration method is adopted to add ozone gas oxidant, a...

Embodiment 2

[0053] A method for advanced treatment of electroplating phosphorus-containing wastewater in this embodiment is basically the same as in Embodiment 1, except that some parameters are adjusted, and the same effect can still be achieved. details as follows:

[0054] In step (A), 30% sodium hydroxide stock solution is added to adjust the pH of the wastewater to 8.

[0055] The ratio of the compound oxidant added in the step (B) is chlorine dioxide: hydrogen peroxide: sodium hypochlorite: ozone=1:1:3:5, the ORP of the control wastewater is 3500mV, the mechanical stirring rate is 180rpm, and the reaction time is 60min.

[0056] In step (C), add 30% sodium hydroxide stock solution to adjust the pH to 8.5.

[0057] In step (D), the stirring speed of adding polyaluminum chloride is 60 rpm, and the reaction time is 15 minutes; the stirring speed of adding polyacrylamide is 60 rpm, and the reaction time is 60 minutes. The mass percent concentration of coagulant polyaluminum chloride s...

Embodiment 3

[0063] A method for advanced treatment of electroplating phosphorus-containing wastewater in this embodiment is basically the same as in Embodiment 1, except that some parameters are adjusted, and the same effect can still be achieved. details as follows:

[0064] In step (A), 30% sodium hydroxide stock solution is added to adjust the pH of the wastewater to 8.3.

[0065] The ratio of the compound oxidant added in the step (B) is chlorine dioxide: hydrogen peroxide: sodium hypochlorite: ozone=1:2:3:5, the ORP of the control wastewater is 3800mV, the mechanical stirring rate is 120rpm, and the reaction time is 60min.

[0066] In step (C), add 30% sodium hydroxide stock solution to adjust the pH to 8.5.

[0067] In step (D), the stirring speed of adding polyaluminum chloride is 120rpm, and the reaction time is 30min; 10%, the dosage of polyaluminum chloride solution is 1L / m 3 ; The dosage of polyacrylamide solution is 3L / m 3 , the mass percent concentration of the polyacryla...

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Abstract

The invention discloses a compound oxidant for advanced treatment of electroplate phosphorate wastewater and a wastewater treatment method, and belongs to the technical field of wastewater treatment. The wastewater treatment method adopts the compound oxidant, which is compounded by a chlorine dioxide solution oxidant, a hydrogen peroxide solution oxidant, a sodium hypochlorite solution oxidant and an ozone gas oxidant according to a certain proportion, and adopts a compound technology of oxidation-coagulating sedimentation-resin adsorption to treat the wastewater. The compound oxidant can be used for conducting advanced treatment on the electroplate phosphorate wastewater, the specific compound oxidant and a special dephosphorizing resin are adopted to conduct advanced treatment on the oxidized and precipitated phosphate, and compared with the conventional adsorption materials such as activated charcoal, the compound oxidant is more suitable for the engineering sewage treatment system, the oxidation ability of the method is strong, the oxidation effect is good, the oxidation efficiency is high, the wastewater treatment quantity is large, and the total phosphorus content in the treated water is steadily reduced below 0.2 mg / L.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to a compound oxidant for advanced treatment of electroplating phosphorus-containing wastewater and a wastewater treatment method. Background technique [0002] Phosphorus index is one of the most important indicators for water eutrophication control. When the total phosphorus content in the water body exceeds 0.02mg / L, it may cause eutrophication of the water body. Eutrophication of water body will seriously damage the ecological balance and affect human health, so it is necessary to strictly control the concentration of phosphorus discharged into the water body. my country's comprehensive sewage discharge standard (GB8978-2002) stipulates that the total phosphorus discharge standard is 0.5mg / L. At the same time, my country's electroplating industry electroplating pollutant discharge standard (GB21900-2008) stipulates that the total phosphorus discharge s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F9/04C02F103/16
Inventor 张炜铭陈良吕路潘丙才花铭汪林徐敬生孙平
Owner NANJING UNIV
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