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A method for advanced oxidation advanced treatment of papermaking wastewater by ferrous salt activated persulfate or monoperoxyhydrogensulfate

A technology of monoperoxyhydrogensulfate and activated persulfate, which is applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, and wastewater treatment in processing, etc. It can solve the problem of narrow pH range, complicated operation process, and concentration of suspended solids in effluent. Advanced problems, to achieve the effect of reducing the chromaticity of the effluent, simple operation process and high activation efficiency

Inactive Publication Date: 2016-04-13
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of advanced treatment of biochemical effluent of papermaking industrial wastewater
In order to solve the problems of narrow applicable pH range, high concentration of suspended solids in effluent, complicated operation process and other problems when the conventional advanced oxidation treatment method is used to treat papermaking biochemical effluent, the present invention discloses a ferrous salt activated persulfate or monoperoxyhydrogensulfate Advanced Salt Oxidation Advanced Treatment of Papermaking Wastewater

Method used

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  • A method for advanced oxidation advanced treatment of papermaking wastewater by ferrous salt activated persulfate or monoperoxyhydrogensulfate
  • A method for advanced oxidation advanced treatment of papermaking wastewater by ferrous salt activated persulfate or monoperoxyhydrogensulfate
  • A method for advanced oxidation advanced treatment of papermaking wastewater by ferrous salt activated persulfate or monoperoxyhydrogensulfate

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Experimental program
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Effect test

Embodiment 1

[0029] Under normal temperature conditions, take papermaking wastewater with a CODcr of 100 mg / L and a pH of 7.5 in a wastewater storage tank. like figure 1 As shown, use a metering pump to pump into the 60L advanced oxidation device at a flow rate of 30L / h, and at the same time pump a certain concentration of oxidant and ferrous sulfate heptahydrate into the water inlet pipe through a peristaltic pump to control the advanced oxidation device. The hydraulic retention time is about 2 hours. Control the influent concentration of sodium persulfate or monoperoxysodium bisulfate in the influent to 1mmol / L and 1.3mmol / L respectively. The addition amount of ferrous salt satisfies the concentration under each reaction condition shown in Table 1 respectively. CODcr detection was carried out on the overflow effluent of the advanced oxidation unit. The above-mentioned advanced oxidation device is a reaction device made of 304 stainless steel that can quickly and effectively mix incomi...

Embodiment 2

[0034] Under normal temperature conditions, take papermaking wastewater with a CODcr of 100 mg / L and a pH of 7.5 in a wastewater storage tank. like figure 1 As shown, use a metering pump to pump into the 60L advanced oxidation device at a flow rate of 30L / h, and at the same time pump a certain concentration of oxidant and ferrous sulfate heptahydrate into the water inlet pipe through a peristaltic pump to control the advanced oxidation device. The hydraulic retention time is about 2 hours. Control the influent concentration of sodium persulfate in the influent to 1mmol / L. The influent concentration of ferrous salt is 1.5mmol / L. The overflow water from the advanced oxidation device flows into the 90L sedimentation device by itself. Before the water inlet of the sedimentation device, according to the different experimental conditions in Table 2, the sodium hydroxide and calcium hydroxide solutions with appropriate concentrations are pumped in at a certain flow rate through the...

Embodiment 3

[0039] Under normal temperature conditions, take papermaking wastewater with a CODcr of 200mg / L and a pH of 7.5 in a wastewater storage tank. like figure 1 As shown, use a metering pump to pump into the 60L advanced oxidation device at a flow rate of 30L / h, and at the same time pump a certain concentration of oxidant and ferrous sulfate heptahydrate into the water inlet pipe through a peristaltic pump to control the advanced oxidation device. The hydraulic retention time is about 2 hours. Control the influent concentration of sodium persulfate in the influent to 2mmol / L. The influent concentration of ferrous salt is 3mmol / L. The overflow water from the advanced oxidation device flows into the 90L sedimentation device by itself. Before the water inlet of the sedimentation device, according to the different experimental conditions in Table 3, the peristaltic pump is pumped into the appropriate concentration of sodium hydroxide, calcium hydroxide and polychlorinated chloride at...

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Abstract

The invention discloses a method for advanced oxidation advanced treatment of papermaking wastewater by ferrous salt activated persulfate or monoperoxyhydrogensulfate. The method is divided into an oxidation stage and a precipitation stage, and the oxidation stage is carried out in advanced oxidation equipment which is easy to mix with waste water, and the hydraulic retention time is greater than 0.5 hours. Using persulfate or monoperoxyhydrogensulfate to react with ferrous salt to generate strong oxidizing sulfate radicals to oxidize and degrade organic matter in papermaking wastewater. The sedimentation stage is carried out in the sedimentation equipment, the hydraulic retention time is more than 1.5 hours, and the flocculation and sedimentation of iron sludge are strengthened by adding lye and polyaluminum chloride. The effluent of the papermaking wastewater based on the advanced oxidation advanced treatment of sulfate radicals established by the invention is clear and the CODcr is low. The method has high efficiency, is easy to operate, and is applicable to a wide pH range, and has great application value especially for the treatment of paper industry wastewater with complex components and high requirements for advanced treatment.

Description

technical field [0001] The invention relates to an advanced treatment technology of industrial organic wastewater, in particular to a method for oxidatively treating papermaking wastewater by catalytically activating persulfate or monoperoxyhydrogensulfate with ferrous salt. Background technique [0002] The wastewater pollutants produced in the process of papermaking industry have complex components, deep color, difficult treatment, and large discharge volume, which is one of the main sources of environmental pollution. At present, the wastewater in the papermaking industry is generally treated with primary physical and secondary biochemical treatment, but the effluent water quality still has problems such as high COD content and deep color, and it is difficult to meet the "Water Pollutant Discharge Standard for Pulp and Paper Industry" (GB3544-2008 ), so it is of great significance for environmental protection and the sustainable development of the paper industry to carry ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F9/04C02F103/28
CPCC02F1/72C02F1/5245C02F1/66C02F2209/001C02F2209/08C02F2303/04
Inventor 万金泉马邕文韩东晖王艳黄明智
Owner SOUTH CHINA UNIV OF TECH
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