Pretreatment method of copper-containing organic waste water

A kind of organic wastewater pretreatment technology, applied in the field of Fenton-like coagulation sedimentation coupled in one system, Fenton, iron reduction of heavy metal ions, can solve the problems of limited application range and cumbersome actual operation, and reduce the treatment effect Gradually reduce, broaden the pH range, and reduce the effect of sludge volume

Active Publication Date: 2016-02-24
NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is not widely used in the treatment of acidic or alkaline copper-containing organic wastewater alone, and the copper ions in the wastewater are not fully utilized under homogeneous conditions to catalyze hydrogen peroxide to degrade organic pollutants
When recovering copper element, the actual operation is also more cumbersome

Method used

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  • Pretreatment method of copper-containing organic waste water
  • Pretreatment method of copper-containing organic waste water
  • Pretreatment method of copper-containing organic waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Acidic copper-containing wastewater (COD=2540mg / L, total copper about 2100mg / L, pH value 2.5) is pumped into the oxidation tank, hydrogen peroxide is added and ultraviolet light is turned on to make H 2 o 2 The concentration is 3000mg / L, then add ferrous sulfate solution, ferric chloride solution, after mixing, Fe 2+ The concentration is 700mg / L, Fe 3+ The concentration is 1000mg / L, the reaction is started for 60 minutes, and the pollutants are degraded under the action of Fenton and Fenton-like;

[0035] (2) The effluent from step (1) was transferred to the zero-valent iron reduction tank, and reacted for 30 minutes. The copper ions in the solution were replaced by copper, covering the surface of zero-valent iron, and the zero-valent iron was converted into ferrous iron. The supernatant was used as Part of the effluent flows back to the oxidation tank;

[0036] (3) The effluent from step (2) enters the coagulation sedimentation tank, adjusts the pH value to 7-8 ...

Embodiment 2

[0038] (1) Alkaline complex copper wastewater (COD=4600mg / L, total copper is about 560mg / L, pH value is 9) is pumped into the oxidation tank, hydrogen peroxide is added and the ultraviolet light device is turned on to make the H 2 o 2 Concentration is 5000mg / L, then add ferrous sulfate solution, ferric chloride solution, make Fe after adding 2+ The concentration is 300mg / L, Fe 3+ When the concentration is 300mg / L, the reaction is started, and a large amount of copper ions are replaced, and pollutants are degraded under the action of Fenton and Fenton-like. Part of the complexed copper ions are destroyed and released by the Fenton reaction, and the reaction time is 120 minutes;

[0039] (2) Transfer the effluent from step (1) to the pre-acid-washed zero-valent iron reduction tank, react for 60 minutes, and use the supernatant as effluent, and partly return to the oxidation tank;

[0040] (3) The effluent from step (2) enters the coagulation sedimentation tank, adjusts the pH...

Embodiment 3

[0042] (1) Acidic copper-containing wastewater (COD=800mg / L, total copper is about 180mg / L, pH value is 4) is pumped into the oxidation tank, and hydrogen peroxide is added to make the H 2 o 2 The concentration is 1500mg / L, turn on the ultraviolet light and add ferrous sulfate solution and ferric chloride solution, after mixing, Fe 2+ The concentration is 100mg / L, Fe 3+ The concentration is 100mg / L, and the reaction is 90min;

[0043] (2) The effluent from step (1) is transferred to the zero-valent iron reduction tank, reacted for 30 minutes, and the supernatant is used as effluent, and part of it is returned to the oxidation tank;

[0044] (3) The effluent from step (2) enters the coagulation sedimentation tank, adjusts the pH value to 7-8 with sodium hydroxide, flocculates and settles for 45 minutes, and the Fe in the effluent 2+ Concentration below 15mg / L, Cu 2+ When the concentration is lower than 0.8mg / L, COD drops to 450mg / L.

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Abstract

The invention discloses a pretreatment method of copper-containing organic waste water. The copper-containing organic waste water contains copper ions, the copper-containing organic waste water is added with hydrogen peroxide and ferrous iron and ferric iron solutions, the mixed solution forms Fenton and Fenton-type reagents under the UV irradiation and the Fenton and Fenton-type reagents can realize catalytic degradation of organic pollutants and release of complex copper ions. The oxidized waste water goes through a zero-valent iron reduction system, the copper ions are displaced by the zero-valent iron and the ferric ions are reduced to form ferrous ions. A part of product water containing the ferrous ions is returned into an oxidation tank for Fenton / Fenton-type oxidation reaction and undergoes an oxidation degradation reaction. The product water is subjected to pH adjustment, pollutants are further removed by flocculation deposition and the deposited product water directly enters into a biochemical system. The zero-valent iron reduction system has a simple and easy replacement method. The pretreatment method fully utilizes copper ions in the system, effectively degrades organic pollutants and effectively recovers copper ions.

Description

technical field [0001] The invention relates to a pretreatment method of copper-containing organic wastewater, in particular to a method in which Fenton, Fenton-like, iron reduction of heavy metal ions and coagulation precipitation are coupled in one system. Background technique [0002] The discharge of copper-containing organic wastewater will have a significant impact on the ecological environment of water bodies. Therefore, certain related treatments must be carried out before copper-containing organic wastewater enters the water body environment to minimize its impact on the environment. The composition of organic chemical wastewater is complex, and it is difficult to meet the standard stably by direct biochemical treatment. When there are a lot of metal ions in the organic chemical wastewater, it will affect the metabolism of microorganisms in the sewage biochemical treatment system, and then affect the treatment effect. [0003] Copper-containing organic wastewater c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/14C02F101/30
CPCY02W10/37C02F9/00C02F1/52C02F1/705C02F1/722C02F2101/30C02F2305/026
Inventor 戴建军何尚卫张洋阳卞为林杜虎
Owner NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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