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Method for treating sewage by DSD acid reduction acid bleeding

A treatment method and technology for reducing acid, which are applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Complete, the production unit is unbearable and other problems, to achieve the effect of improving the separation performance of mud and water, no secondary pollution, and easy operation

Inactive Publication Date: 2004-11-24
LUYUAN ENVIRONMENTAL PROTECTION ENG HEBEI
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Problems solved by technology

Its main disadvantages are: (1) The cost of wastewater treatment is high, and the cost of flocculant, neutralizing alkali and adsorption material is 8-14 yuan / ton, which is difficult for the production unit to bear; (2) The removal rate of aniline pollutants is low, and the color The group is not completely destroyed, and the treated water is easy to return to color. After being discharged into the water environment, it will still cause different degrees of environmental pollution.

Method used

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  • Method for treating sewage by DSD acid reduction acid bleeding
  • Method for treating sewage by DSD acid reduction acid bleeding

Examples

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Embodiment 1

[0024] Reductive acid analysis wastewater is discharged from the workshop, first enters the adjustment tank and mixes thoroughly, controls pH 3.5, temperature 40°C, then pumps it into reactor I, adds hydrogen peroxide 1.5Kg / ton wastewater into reactor I, ferrous sulfate 0.2 Kg / ton of wastewater, the reaction time is more than 0.5 hours, the longer the time, the better the effect. After the reaction, the wastewater flows to the reactor II equipped with iron-carbon filler. The iron-carbon filler is to mix iron filings and coke with a particle size of 2-10mm evenly After loading into the reactor, the filling ratio of coke and iron filings can be 1-5:1-99, the better ratio is 1-5:95-99, the micro-electrolysis reaction time is more than 0.5 hours, the longer the time, the better the effect , and then poured into the neutralization tank and neutralized to PH8 with milk of lime. After separation of mud and water by sedimentation method, the separated sludge can be used as raw material...

Embodiment 2

[0026] The steps such as its oxidation reaction, neutralization reaction, mud-water separation and decalcification are all the same as in Example 1, but the difference lies in the electrolysis reaction, which is to place an iron plate electrode in the reactor II, pass 12V direct current, and pass the oxidized waste water to into the reactor II to carry out the electrolysis reaction for more than 1 hour.

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Abstract

The method for treating DSD acid reduction acid-elutriated waste water: a). regulating pH value of reduction acid-elutriated waste water to 3-4, adding hydrogen peroxide and ferrous salt to make oxidation reaction; b). feeding oxidated waste water into electrolytic reaction to make electrolytic reaction; c). neutralizing wastewater after electrolytic reaction to make its pH value be 8-9: d). separating mud and water; and e). making the separated liquor undergo the process of decalcification. Said invention is simple in process and equipment, its cost is low, and decolouring effect is good, and does not produce secondary pollution.

Description

technical field [0001] The invention relates to a treatment method for DSD acid reduction acid analysis wastewater, which belongs to the field of industrial sewage purification treatment. Background technique [0002] The full name of DSD acid is 4,4'-diaminostilbene-2,2'-disulfonic acid, also known as stilbenic acid, molecular formula C 14 h 14 N 2 o 6 S 2 , yellow needle-like hygroscopic crystals, the industrial product is a light yellow paste, its production process is based on p-nitrotoluene as raw material, sulfonated with oleum to obtain p-nitro-o-sulfonic acid toluene, and then oxidized and condensed to obtain 4,4'-dinitrostilbene-2,2'-disulfonic acid is finally obtained by reducing and refining iron powder. Reductive acid analysis wastewater refers to the wastewater generated during the acid analysis process after iron powder reduction. Containing higher concentrations of aniline, nitrobenzene pollutants and higher chroma, it is a toxic and harmful wastewater wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F9/08
Inventor 于容朴孟凡勇孟凡利翟希夫宋凤霞
Owner LUYUAN ENVIRONMENTAL PROTECTION ENG HEBEI
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