Treatment method of organic arsine-containing wastewater
A treatment method, organic arsine technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem that wastewater is difficult to meet the standard in one-time treatment, and achieve the value of large-scale industrialization promotion Effect
Inactive Publication Date: 2014-01-15
SHAANXI SHENGMAI PETROLEUM
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Problems solved by technology
However, this method is difficult to treat wastewater with COD>3 000 mg / L up to the standard at one time.
At present, there are no relevant reports on the treatment of high-concentration organic arsine and high-COD wastewater in China.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0013] Take a certain amount of wastewater, its arsenic concentration is 4800 mg / L, COD 4550 mg / L, pH 2.1. Add 2.1% FeCl to it 3 6H 2 0, stir to dissolve, then adjust the pH to 8-8.5 with Ca0, then continue to stir for 2 h, add PAM 0.02 mg / L, stir for 5 min, let stand to separate layers, and take the supernatant;
[0014] Add 0.92% FeSO to the supernatant 4 ·7H 2 0, adjust the pH to 3 after stirring and dissolving, then add 1.2% of 30% H 2 0 2 , 30min added; continue to stir for 2.5 h, then add Ca0 to adjust the pH to 8-8.5, stir for another 2 h, let stand for stratification, and take the supernatant. After testing, the arsenic concentration in the supernatant was 0.25 mg / L, and the COD was 92 mg / L.
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The invention discloses a treatment method of organic arsine-containing wastewater, and relates to a treatment method of wastewater. The treatment method of the organic arsine-containing wastewater comprises the following steps: adding FeCl3.6H2O into the wastewater, stirring for dissolving, adjusting the pH to 8-8.5 by CaO, further stirring for 2 h, adding 0.02 mg / L PAM (polyacrylamide), stirring for 5min, standing for layering, and taking out a supernatant; adding FeSO4.7H2O into the supernatant, stirring for dissolving, adjusting the pH to 3, and dripping 30% of H2O2 within 30 min; further stirring 2.5 h, adding the CaO to adjust the pH to 8-8.5, stirring again for 2 h, standing for layering, and taking out supernatant. By the treatment method, wastewater with high organic arsenic content and high COD content can be treated, and the organic arsenic and the COD can be simultaneously removed; the total arsenic in the treated wastewater can be reduced to below 0.5 mg / L and the COD can be reduced to below 150 mg / L, so that the outlet water quality meets a national second-level discharge standard.
Description
technical field [0001] The invention relates to a method for treating waste water. Background technique [0002] Arsenic-containing substance is a kind of heavy metal substance. Its emissions have strict requirements. A large amount of arsenic-containing wastewater will be generated during the production of Rocza arsine. The wastewater not only contains inorganic arsenic, but also contains organic arsine with a high concentration that is more difficult to treat. The mass concentration of total arsenic is generally 3 000-6 000 mg / L, of which organic arsine accounts for more than 70%. The main components of organic arsine are 3-nitro-4-hydroxyphenylarsine acid (roxarsine), 4-aminophenylarsine acid (alsanic acid), etc., and the inorganic arsenic is mainly arsenic acid. The pH of the wastewater is generally 2 to 2.5, and the COD is generally 3 000-6 000 mg / L. In addition to organic arsine and inorganic arsenic, the wastewater also contains o-nitroaniline, o-nitrophenol and or...
Claims
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IPC IPC(8): C02F9/04
Inventor 王耀斌
Owner SHAANXI SHENGMAI PETROLEUM
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