Biochemical treatment method for gallic acid industrial wastewater
A technology for producing gallic acid and waste water, applied in natural water treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve problems such as COD and other indicators exceeding standards, secondary pollution of metal ions, failure to meet discharge standards, etc. To achieve the effect of stable operation, less treatment equipment and good water quality
Active Publication Date: 2015-04-29
GUIYANG JILONG TANNIN CHEM
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Problems solved by technology
Although this method is feasible, it is not only costly, but also limited to waste water with small wastewater such as COD, BOD, and chroma.
As for the waste water from gallic acid produced in the gallic acid raw material production industry, its COD and other indicators seriously exceed the standard. Chemical treatment not only fails to meet the discharge standard, but also brings in metal ions to cause secondary pollution.
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[0023] Such as figure 1 As shown, a biochemical treatment method for gallic acid production wastewater includes the following steps: (1) acid-base adjustment: neutralize the acid wastewater with calcium hydroxide, measure its BOD / COD ≥ 0.3, and its pH is at a level where a large number of microorganisms can grow Within the range, take the supernatant and store it in the temporary storage pool, and then enter the anaerobic treatment area. COD Cr The removal rate is about 20%.
[0024] (2) Anaerobic reaction: Use 10% hydrochloric acid to adjust the pH value of the sewage in step (1) to the optimum pH value of the domesticated anaerobic microorganisms, and then add it at a ratio of 10%--20%, at a certain temperature Anaerobic 72--86h, take its supernatant and then anaerobic 72h at the same adding ratio and temperature. COD at this time Cr The removal rate is about 70%. The domesticated anaerobic microorganisms are methanogenic bacteria, including methanogenic bacteria, cocci...
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The invention discloses a biochemical treatment method for gallic acid industrial wastewater. The method comprises the following steps of: (1) acid-base regulation: neutralizing the wastewater with calcium hydroxide; (2) anaerobic reaction: regulating the pH value of the wastewater otained in the step (1) with 10% hydrochloric acid to the most suitable pH value for domesticated anaerobic microorganism, then adding the domesticated anaerobic microorganism, carrying out anaerobic treatment for 72-86 hours at 30-38 DEG C, taking the supernate, adding the same proportion of domesticated anaerobic microorganism, and carrying out anaerobic treatment for 72 hours at the same temperature; (3) anoxic treatment: standing for 1-2 hours in the open air; (4) aerobic treatment comprising four levels: adding aerobic bacteria, wherein the temporal summation of aeration of each level is not more than 8 hours; (5) advanced post-processing: adding 3%-7% of polymeric aluminum chloride into the wastewater treated in the step (4).
Description
technical field [0001] The invention relates to a method for treating waste water, which belongs to the field of sewage treatment. Background technique [0002] Gallic acid is a characteristic product produced from gallnut, and is a component of photoresist stripping solution, intermediate of medicine, rubber anti-aging agent, food and feed antioxidant, color developer for the production of carbonless copy paper, heat-sensitive recording paper, etc. Intermediate materials, so the demand for it is quite large, but the waste water produced due to the production of gallic acid cannot be effectively treated, thus affecting and limiting the production of gallic acid. The wastewater generated from the production of gallic acid is mainly composed of hydrolysis wastewater, refined wastewater and waste residue treatment wastewater, etc. It mainly contains residual gallic acid, inorganic salts (mainly sodium chloride), phenolic pigments, acids, colloidal organic matter and other compo...
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IPC IPC(8): C02F9/14C02F103/36
Inventor 胡鹏刚赵晓燕罗志军何志洪陈立杨志波王晟楠
Owner GUIYANG JILONG TANNIN CHEM