Innocent treatment method of waste solution generated after agricultural product laboratory test

A harmless treatment and waste liquid treatment technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, heating water/sewage treatment, etc., can solve problems such as polluting the environment, endangering human health, polluting water sources, etc., to achieve Protect the water environment and reduce the effect of harm

Active Publication Date: 2012-12-26
王冬群
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Problems solved by technology

If it is discharged at will without harmless treatment, it will pollu

Method used

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Examples

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Embodiment

[0017] Harmless treatment of waste liquid after laboratory testing of agricultural products:

[0018] a. Acetonitrile waste liquid treatment: adjust the pH value of the acetonitrile waste liquid to 8~10 with calcium hydroxide, and then gradually add ferrous sulfate solution with a mass percent concentration of 10% under stirring until no more precipitation, filter , precipitate and store, the filtrate is adjusted to a pH value of 6.5-7.5 with a weak acid, and then discharged; in this way, acetonitrile is converted into a blue precipitate of ferricyanide complex, thereby achieving the purpose of harmless treatment of acetonitrile waste liquid;

[0019] b. Dichloromethane waste liquid treatment: Put the dichloromethane waste liquid into a rotary evaporator, distill at 500mbar, water bath at 38°C, until there is no liquid dripping from the distillation bottle, collect the distillate; the dichloromethane is distilled and can be Reuse;

[0020] c. Treatment of strong acid waste li...

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Abstract

The invention discloses an innocent treatment method of a waste solution generated after an agricultural product laboratory test. The method comprises the steps of treatments of an acetonitrile waste solution, a methylene dichloride waste solution, a strong acid waste solution, a strong base waste solution, a mercury waste solution, a cadmium and lead waste solution and a chrome waste solution; after the treatments, acetonitrile is converted into a ferricyanide complex and stored, mercury is converted into a mercuric sulfide deposit and stored, the cadmium and lead waste solution is converted into an aluminum hydroxide, lead hydroxide and cadmium hydroxide co-precipitate and stored, the chrome waste solution is converted into an iron hydroxide and chrome hydroxide co-precipitate and stored, the methylene dichloride can be recycled after being distilled, strong acid and strong base are neutralized and diluted and then discharged; in this way, the waste solution generated after the laboratory test is almost not directly discharged into water, so that the water environment is protected and the harmfulness of life caused by the waste solution is reduced.

Description

technical field [0001] The invention relates to waste liquid treatment technology in laboratory work, in particular to laboratory testing of agricultural products [0002] The harmless treatment method of waste liquid. Background technique [0003] Agricultural product quality laboratory testing includes testing for pesticide residues (organophosphorus, organochlorine, pyrethroids and carbamates) and heavy metals (mercury, chromium, cadmium and lead). In the process of pesticide residue detection, highly toxic acetonitrile and dichloromethane are used as extractants. Acetonitrile easily reacts with acids to produce highly toxic volatile gas hydrocyanic acid (HCN). The oral mucosa absorbs about 50 mg of hydrocyanic acid. It can kill instantly; the negative effects of dichloromethane on the environment and people have long been known to people. In the process of heavy metal detection, not only strong acids (hydrochloric acid, sulfuric acid and nitric acid) and strong bases ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/04
Inventor 王冬群吴华新
Owner 王冬群
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