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Water treatment method for reducing nitrosodimethylamine in water by green rust and zero-valent iron

A technology of nitrosodimethylamine and zero-valent iron, which is applied in the direction of reduced water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc., and can solve the problem of high energy consumption

Active Publication Date: 2019-10-22
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

UV photolysis can effectively degrade NDMA, but it requires 10 times the UV dose of normal disinfection treatment, which is about 1000mJ cm -2 , higher energy consumption

Method used

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  • Water treatment method for reducing nitrosodimethylamine in water by green rust and zero-valent iron

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] refer to figure 1 , a water treatment method of nitrosodimethylamine in green rust synergistically reducing water with zero-valent iron, comprising the following steps:

[0016] 1) Add 8mL (set volume to 8mL) deionized anaerobic water into an 8mL extraction bottle, the initial pH value is 7.0, then add 10g·L -1 Iron powder, then add 2.5g·L -1 , 5g·L -1 , 10g L -1 , 15g·L -1 of patina, finally add 100μg·L -1 NDMA, tightly cap the bottle, put it into the rotary incubator QB-328 (Qilin Beier Instrument Manufacturing Co., Ltd., Haimen City) at 45r min -1 The rotation speed is protected from light.

[0017] 2) Sampling is carried out at regular intervals. The collected samples are press-filtered through a 0.22-0.45 μm filter membrane to separate unreacted iron powder and patina, thereby terminating the reaction. The obtained water samples are used for analysis...

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Abstract

A water treatment method for reducing nitrosodimethylamine in water by green rust and zero-valent iron comprises the following steps: 1) preparing a preset volume of deionized oxygen-free water with an initial pH of 7.0, adding 10 g.L<-1> of iron powder, adding 2.5-15 g.L<-1> of green rust, finally adding 100 [mu]g.L<-1> of NDMA, tightly covering with a bottle cap, placing the covered bottle in arotary incubator, and rotating the bottle in a dark place; and 2) carrying out timing sampling, carrying out pressure filtration on the obtained sample by a syringe through a 0.22-0.45 [mu]m filter toseparate unreacted iron powder and green rust in order to terminate a reaction, and analyzing the NDMA concentration of the obtained water sample. The method increases the degradation rate of NDMA.

Description

technical field [0001] The invention belongs to the field of water treatment and relates to a chemical method for metal synergistic reduction. Background technique [0002] Nitrosodimethylamine (NDMA) is a substance with a high risk of carcinogenicity. NDMA is classified as a 2A carcinogen in the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization. NDMA is present in many industrial processes such as tanning, rubber and tire manufacturing, pesticide and dye production, detergent and surfactant manufacturing, fish processing, casting, etc. People have detected NDMA in water sources, and subsequent studies have found that it appears as a disinfection by-product in the disinfection process of drinking water treatment plants and sewage treatment plants. The widespread presence of NDMA in water has aroused great concern in the field of water treatment, so it is necessary to develop technologies that can effectively co...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F101/38
CPCC02F1/70C02F1/705C02F2101/38
Inventor 韩莹黄俊恺刘宏远吴越张克敏吴召
Owner ZHEJIANG UNIV OF TECH
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