Method for processing papermaking wastewater by advanced oxidation treatment of activating persulfate or monoperoxy-hydrosulfate with ferrous salt

A technology of monoperoxybisulfate and activated persulfate, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, processing wastewater treatment, etc. Complicated and other problems, to achieve the effect of reducing the color of the effluent, easy to dissolve, and simple operation process

Inactive Publication Date: 2014-05-28
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Method for processing papermaking wastewater by advanced oxidation treatment of activating persulfate or monoperoxy-hydrosulfate with ferrous salt
  • Method for processing papermaking wastewater by advanced oxidation treatment of activating persulfate or monoperoxy-hydrosulfate with ferrous salt
  • Method for processing papermaking wastewater by advanced oxidation treatment of activating persulfate or monoperoxy-hydrosulfate with ferrous salt

Examples

Experimental program
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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 1As 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 to 1 mmol / L and 1.3 mmol / 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 incoming water.

[...

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 1 mmol / L. The influent concentration of ferrous salt is 1.5 mmol / 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 t...

Embodiment 3

[0040] Under normal temperature conditions, take papermaking wastewater with a CODcr of 200 mg / L and a pH of 7.5 in a wastewater storage tank. like figure 1 As shown, the metering pump is pumped into the 60L advanced oxidation device at a flow rate of 30 L / h, and at the same time, a certain concentration of oxidant and ferrous sulfate heptahydrate are pumped into the water inlet pipe through the peristaltic pump to control the advanced oxidation. The hydraulic retention time of the unit is about 2 hours. Control the influent concentration of sodium persulfate in the influent to 2 mmol / L. The influent concentration of ferrous salt was 3 mmol / 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 polychlo...

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Abstract

The invention discloses a method for processing papermaking wastewater by an advanced oxidation treatment of activating persulfate or monoperoxy-hydrosulfate with ferrous salt. The method is divided into two phases, namely an oxidation phase and a precipitation phase; wherein the oxidation phase is carried out in advanced oxidation equipment where wastewater is prone to mix, the hydraulic retention time is more than 0.5 hour, then persulfate or monoperoxy-hydrosulfate is subjected to carry out reactions with ferrous salt to generate sulfate free radicals with a strong oxidizing property, the sulfate free radicals can degrade organisms in the wastewater; the precipitation phase is carried out in precipitation equipment, the hydraulic retention time is more than 1.5 hours, and an alkaline solution or polymerized aluminum chloride is added so as to promote the flocculation and sedimentation of iron mud. The papermaking wastewater processing method is based on sulfate free radical advanced oxidation treatment, and the processed wastewater is clear and has a low COD value and a low Cr content. The method has the advantages of high efficiency, easy operation, and wide applicable pH range, and is especially suitable for processing papermaking wastewater having complicated components and high requirements on 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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IPC IPC(8): C02F1/72C02F9/04C02F103/28
CPCC02F1/5245C02F1/66C02F1/72C02F2209/001C02F2209/08C02F2303/04
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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