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Advanced treatment and reuse method for bio-chemical effluent of chemical wastewater

A technology for biochemical effluent and chemical wastewater, applied in the direction of oxidation water/sewage treatment, water/sewage treatment, special compound water treatment, etc., can solve the problems of organic carbonization, intermediate products or by-products with different structures, etc., and achieve easy operation , high water quality standards, and the effect of reducing costs

Active Publication Date: 2017-06-23
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Fenton oxidation technology cannot completely carbonize organic matter, and it is easy to produce intermediate products or by-products with different structures, and even some intermediate products are far more toxic than the original substances.

Method used

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  • Advanced treatment and reuse method for bio-chemical effluent of chemical wastewater
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  • Advanced treatment and reuse method for bio-chemical effluent of chemical wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The biochemical effluent of a large chemical wastewater treatment plant, after adjusting the pH value to 6, added magnetic resin and H to the water sample in sequence 2 o 2 , the volume of magnetic resin accounts for 2% of the volume of chemical wastewater biochemical effluent, H 2 o 2 The concentration was 4 mmol / L, and after 300 minutes of reaction, solid-liquid separation was carried out. Add NaClO disinfectant to the separated chemical wastewater biochemical effluent, press ClO 2 Calculated as 5mg / L, and turn on the 30W ultraviolet lamp to irradiate for 600 seconds at the same time, the water quality of the effluent is shown in Table 1. Finally, the separated magnetic resin is regenerated by mixing with 5wt.% sodium hydroxide and 70wt.% methanol. The regeneration time is 130 minutes, and then left to stand for 55 minutes; the regenerated magnetic resin is used as fresh magnetic resin. As shown in Table 1, taking the water quality standard for washing water in th...

Embodiment 2

[0032] The biochemical effluent of a large chemical wastewater treatment plant, after adjusting the pH value to 5, added magnetic resin and H 2 o 2 , the volume of magnetic resin accounts for 1.5% of the volume of chemical wastewater biochemical effluent, H 2 o 2 The concentration was 3 mmol / L, and after 100 minutes of reaction, solid-liquid separation was carried out. Add NaClO disinfectant to the separated chemical wastewater biochemical effluent, press ClO 2 Calculated as 5mg / L, and turn on the 30W ultraviolet lamp to irradiate for 120 seconds at the same time, the effluent water quality is as shown in Table 2. Finally, the separated magnetic resin is regenerated by mixing with 15wt.% sodium hydroxide and 20wt.% methanol. The regeneration time is 60 minutes, and then left to stand for 60 minutes; the regenerated magnetic resin is used as fresh magnetic resin. As shown in Table 2, taking the boiler feed water quality standard in Urban Sewage Recycling-Industrial Water Qu...

Embodiment 3

[0036] The biochemical effluent of a large chemical wastewater treatment plant, after adjusting the pH value to 7, added magnetic resin and H to the water sample in sequence 2 o 2 , the volume of magnetic resin accounts for 3% of the volume of chemical wastewater biochemical effluent, H 2 o 2 The concentration was 5 mmol / L, and after 550 minutes of reaction, solid-liquid separation was carried out. Add NaClO disinfectant to the separated chemical wastewater biochemical effluent, press ClO 2Calculated as 5mg / L, and turn on the 30W ultraviolet lamp to irradiate for 1800 seconds at the same time, the water quality of the effluent is shown in Table 3. Finally, the separated magnetic resin is regenerated by mixing with 10wt.% sodium hydroxide and 50wt.% ethanol. The regeneration time is 100 minutes, and then left to stand for 65 minutes; the regenerated magnetic resin is used as fresh magnetic resin. As shown in Table 3, with reference to the water quality standards for process...

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Abstract

The invention relates to an advanced treatment and reuse method for bio-chemical effluent of chemical wastewater. The advanced treatment and reuse method comprises the following steps: (1) using a spraying-suspending polymerization method to prepare magnetic resin with high capacity of Fe3O4; (2) performing advanced treatment on the bio-chemical effluent of the chemical wastewater with the magnetic resin prepared in step (1), adding 3-5mmol / L of H2O2 into the bio-chemical effluent of the chemical wastewater, and performing a mixing reaction for 60-600min; (3) performing solid-liquid separation on mixed wastewater treated in step (2) and disinfecting the separated bio-chemical effluent of the chemical wastewater. According to the advanced treatment and reuse method for the bio-chemical effluent of the chemical wastewater, persistent organic pollutants in the wastewater can be effectively removed, and the toxicity of the persistent organic pollutant is reduced, so that the standard requirement of reusing water quality is met, and the ecological security in a reusing process of the wastewater can be ensured.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a method for advanced treatment and reuse of chemical wastewater biochemical effluent. Background technique [0002] The chemical industry is one of the pillar industries of our country, but at the same time, the environmental pollution caused by this industry is also very serious. According to the environmental statistical annual reports in recent years, the discharge of chemical wastewater ranks among the top three in the discharge of industrial wastewater, and more importantly What's more, chemical wastewater not only has a large amount of water, but also the organic substances contained in it are highly toxic and difficult to degrade, so it has become the focus of people's attention. After biochemical treatment of chemical wastewater, COD and other indicators are difficult to meet the discharge standards, and it is often necessary to add advanced treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12
CPCC02F9/00C02F1/722C02F1/32C02F1/28C02F1/48C02F1/66C02F2303/04C02F2305/026C02F1/288C02F1/481C02F1/76C02F2101/30C02F1/325C02F1/488
Inventor 周庆金晶李爱民徐林镇程加德周伟伟冯天宇黄艳王未
Owner NANJING UNIV
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