A method and equipment for efficiently and economically removing antimony in printing and dyeing wastewater

An economical technology for printing and dyeing wastewater, applied in the direction of combustion methods, lighting and heating equipment, chemical instruments and methods, etc., can solve the problems of high chemical cost, low treatment efficiency, large dosage, etc., and achieve reduced chemical cost and low chemical cost , the effect of easy operation

Active Publication Date: 2020-11-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, polyferric sulfate has high antimony removal efficiency by coagulation, but this method needs to repeatedly adjust the pH, and the cost of chemicals is high, and the cost performance is low; while ferrous sulfate is cheap, but the treatment efficiency is low, and a large dosage is required to achieve the standard emission

Method used

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  • A method and equipment for efficiently and economically removing antimony in printing and dyeing wastewater

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Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: In this embodiment, a method for efficiently and economically removing antimony in printing and dyeing wastewater is to use the printing and dyeing wastewater of a printing and dyeing enterprise according to figure 1 The process is carried out, and the antimony concentration in the printing and dyeing wastewater containing antimony is 3330.6 μ g / L, including the following steps:

[0036] (1) Antimony-containing printing and dyeing wastewater enters the reaction pool from the regulating tank, and hydrochloric acid dissolved in ferrous sulfate is first added to the reaction tank. , the mass ratio of ferrous sulfate in hydrochloric acid containing ferrous sulfate to antimony-containing printing and dyeing wastewater is 600ppm, and then add slaked lime and anionic polyacrylamide (PAM, Henan Haiyun Environmental Protection Technology Co., Ltd.), and the dosages are respectively 60ppm and 2ppm, that is, the mass of slaked lime accounted for 60ppm in the antimony...

Embodiment 2

[0040] Embodiment 2: In this embodiment, a method for efficiently and economically removing antimony in printing and dyeing wastewater is to use antimony-containing printing and dyeing wastewater from a printing and dyeing enterprise according to figure 1 The process is carried out, and the antimony concentration in the printing and dyeing wastewater containing antimony is 2822.5μg / L, including the following steps:

[0041] (1) Antimony-containing printing and dyeing wastewater enters the reaction tank from the adjustment tank, and first adds hydrochloric acid dissolved in ferrous sulfate in the reaction tank. Slaked lime and anionic polyacrylamide (PAM, Henan Haiyun Environmental Protection Technology Co., Ltd.), the dosage is 80ppm and 3ppm respectively, 200r / min rapid mixing reaction 2min;

[0042] (2) The wastewater after the reaction enters the primary sedimentation tank, the effluent pH of the primary sedimentation tank is 7.5, and the antimony concentration is 258.3 μg / L....

Embodiment 3

[0045] Embodiment 3: In this embodiment, a method for efficiently and economically removing antimony in printing and dyeing wastewater is to use antimony-containing printing and dyeing wastewater from a printing and dyeing enterprise according to figure 1 The process is carried out, and the antimony concentration in the printing and dyeing wastewater containing antimony is 2525.4 μ g / L, including the following steps:

[0046] (1) The antimony-containing printing and dyeing wastewater enters the reaction pool from the regulating tank, and in the reaction tank, first mixed with hydrochloric acid dissolved in ferrous sulfate and potassium permanganate, wherein, the dosage of ferrous sulfate is the mass of antimony in the antimony-containing printing and dyeing wastewater The concentration is 71.3 times that of 180ppm, and the dosage of potassium permanganate is 0.56 times of that of ferrous sulfate, that is, 100ppm. Add slaked lime and anionic polyacrylamide (PAM, Henan Haiyun Env...

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Abstract

The invention discloses a method and device for efficiently and economically removing antimony in printing and dyeing wastewater. The wastewater enters a reaction tank through an adjusting tank, aciddissolving ferrous sulfate, slaked lime and anionic polyacrylamide are sequentially put into the reaction tank and subjected to a coagu-flocculation reaction; the mixture enters a primary settling tank after reacting, settled sludge is subjected to plate-frame pressure filtration, and separated wastewater enters an aerobic biochemical tank; the obtained product after biochemical treatment enters asecondary settling tank, separated sludge back flows to the biochemical tank, and the wastewater is introduced into a secondary biochemical tank; the wastewater after treatment enters a final settling tank, the separated wastewater is contained in tubes if reaching a standard or is further treated and reused to a workshop, and surplus sludge is subjected to plate-frame pressure filtration to be incinerated. The method is easy and convenient to operate, low in medicament cost and obvious in antimony removing effect, and the final antimony concentration of the wastewater can be stably reduced to 100 micrograms / L or below; aeration of the aerobic sludge tank is fully used, it is promoted that ferrous in the wastewater is oxidized to ferric iron, and a complexing effect and the settling performance between the iron oxide and antimonite are enhanced.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method and equipment for efficiently and economically removing antimony in printing and dyeing wastewater. Background technique [0002] Antimony is a typical toxic and harmful heavy metal element. Studies have shown that antimony is chronically toxic and carcinogenic to organisms and humans. It has been listed as a priority pollutant by the US Environmental Protection Agency (USEPA) and the European Union (EU). With the rapid development of textile and printing and dyeing industries, antimony and its compounds are widely used in industry, the emission and pollution of heavy metal antimony are becoming more and more serious. In 2015, the "Water Pollutant Discharge Standard for Textile Dyeing and Finishing Industry" (GB 4287-2012) was revised and required: at the total discharge outlet of enterprise wastewater, the standard direct and indirect discharge limits of total ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F11/122F23G7/00C02F101/20C02F103/30
CPCC02F1/5236C02F1/5281C02F1/56C02F3/02C02F9/00C02F11/122C02F2001/007C02F2101/20C02F2103/30C02F2301/043C02F2301/08F23G7/001F23G2209/12
Inventor 史惠祥李威陈磊蒋婷方荣业
Owner ZHEJIANG UNIV
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