Method for treating heavy metal complex wastewater based on UV/chlorine advanced oxidation technology

An advanced oxidation technology and heavy metal technology, which is applied in the field of treatment of heavy metal complex wastewater based on UV/chlorine advanced oxidation technology, can solve problems such as poor effect of heavy metal complex wastewater, achieve large-scale engineering applications, and have a wide range of pH applications. , the effect of high photon yield

Active Publication Date: 2017-09-22
WENZHOU UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] In order to overcome the current problems of poor treatment of heavy metal complex wastewater in the prior art, and the existing advanced oxidation technology is limited by factors such as agent cost, catalysis or electrode materials, the present invention provides a method that can realize electroplating, manufacturing, etc. A new type of UV / chlorine advanced oxidation technology for treating heavy metal complex wastewater with economical and efficient treatment of wastewater from leather, printed circuit boards and other industries

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  • Method for treating heavy metal complex wastewater based on UV/chlorine advanced oxidation technology

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Embodiment 1

[0019] Prepare Cu-EDTA wastewater with tap water at a concentration of 0.3 mmol / L, a molar ratio of sodium hypochlorite to Cu-EDTA of 60, pH 4.0, and a temperature of 25 0 c. Carry out the reaction for 60 min according to the steps in a method for treating heavy metal complex wastewater based on UV / chlorine advanced oxidation technology of the present invention. In this implementation, CuEDTA was completely degraded within 30 min. After 60 min of reaction, the removal rate of TOC was about 82%, and the removal rate of Cu(II) was about 95%.

Embodiment 2

[0021] Prepare Ni-EDTA wastewater with tap water at a concentration of 0.3 mmol / L, a molar ratio of sodium hypochlorite to Ni-EDTA of 90, pH 3.0, and a temperature of 25 0 c. Carry out the reaction for 60 min according to the steps in a method for treating heavy metal complex wastewater based on UV / chlorine advanced oxidation technology of the present invention. In this embodiment, Ni-EDTA is completely degraded within 20 minutes. After 60 minutes of reaction, the removal rate of TOC is about 86%, and the removal rate of Ni(II) is about 98%.

Embodiment 3

[0023] The concentration of Ni-NTA wastewater was prepared with tap water to be 0.3 mmol / L, the molar ratio of bleaching powder to Ni-NTA was 90, pH 4.0, temperature 25 0 c. Carry out the reaction for 60 min according to the steps in a method for treating heavy metal complex wastewater based on UV / chlorine advanced oxidation technology of the present invention. In this embodiment, Ni-NTA was completely degraded within 30 min, and after 60 min of reaction, the removal rate of TOC was about 80%, and the removal rate of Ni(II) was about 97%.

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Abstract

The invention belongs to the field of industrial wastewater treatment, and particularly relates to a method for treating heavy metal complex wastewater based on a UV/chlorine advanced oxidation technology. The following technical schemes adopted by the invention are that the method for treating the heavy metal complex wastewater based on the UV/chlorine advanced oxidation technology is characterized by comprising the following steps: (1) dropping a chlorine oxidizing agent in to the heavy metal complex wastewater, then regulating pH of water quality by using hydrochloric acid or sodium hydroxide solutions and stirring, and lighting and treating a damaged complex structure, wherein the dropping is carried out according to a molar equivalence ratio that active chlorine produced by the chlorine oxidizing agent to complex-state heavy metal in water is (5-150) to 1; (2) regulating a pH value to enable the heavy metal to form precipitants, and then carrying out solid-liquid separation to complete wastewater treatment. By adopting the scheme, a novel method for treating the heavy metal complex wastewater based on the UV/chlorine advanced oxidation technology which can realize economic and high-efficient treatment on wastewater in a variety of industries such as electroplating, tanning, printing circuit board and the like.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a method for treating heavy metal complex wastewater based on UV / chlorine advanced oxidation technology. Background technique [0002] Complex heavy metal wastewater is the focus and difficulty of the current industrial wastewater treatment. It mainly comes from electroplating, circuit boards, surface treatment, tanning and papermaking industries, and poses a serious threat to human health and the ecological environment. Because organic complexing agents such as citric acid, tartaric acid, sodium alginate, EDTA and NTA are widely used in the production processes of these industries, heavy metals in wastewater exist in complex forms. Compared with free heavy metals, complex heavy metals are difficult to be effectively removed by traditional chemical precipitation, coagulation, adsorption and other methods due to their stable structure. Therefore, it is i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/76C02F1/66C02F9/08C02F101/20
CPCC02F1/32C02F1/66C02F1/766C02F2101/20
Inventor 黄先锋王义王茜然郑向勇张业健金展赵敏
Owner WENZHOU UNIVERSITY
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