Method and device 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, low cost performance, etc., to achieve reduced chemical cost, low chemical cost, The effect of easy operation

Active Publication Date: 2019-07-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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  • Method and device for efficiently and economically removing antimony in printing and dyeing wastewater
  • Method and device for efficiently and economically removing antimony in printing and dyeing wastewater

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: In this example, an efficient and economical method for removing antimony in printing and dyeing wastewater is to use printing and dyeing wastewater from a printing and dyeing company figure 1 The process of treatment, the concentration of antimony in the antimony-containing printing and dyeing wastewater is 3330.6μg / L, including the following steps:

[0036] (1) The antimony-containing printing and dyeing wastewater enters the reaction tank from the regulating tank, and the hydrochloric acid with ferrous sulfate dissolved in the reaction tank is first added. The dosage of ferrous sulfate is 180.1 times the mass concentration of antimony in the antimony-containing printing and dyeing wastewater (that is, 600ppm) , 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...

Embodiment 2

[0040] Example 2: In this example, an efficient and economical method for removing antimony in printing and dyeing wastewater is to use antimony-containing printing and dyeing wastewater from a printing and dyeing company figure 1 The process of processing, the concentration of antimony in the antimony-containing printing and dyeing wastewater is 2822.5μg / L, including the following steps:

[0041] (1) The antimony-containing printing and dyeing wastewater enters the reaction tank from the regulating tank, and the hydrochloric acid with ferrous sulfate dissolved in the reaction tank is first added. The dosage of ferrous sulfate is 194.9 times the mass concentration of antimony in the wastewater, that is, 550ppm, and then dosing Hydrated lime and anionic polyacrylamide (PAM, Henan Haiyun Environmental Protection Technology Co., Ltd.), the dosages are 80ppm and 3ppm, 200r / min rapid mixing reaction for 2min;

[0042] (2) The wastewater after the reaction enters the primary sedimentatio...

Embodiment 3

[0045] Example 3: In this example, an efficient and economical method for removing antimony in printing and dyeing wastewater is to use antimony-containing printing and dyeing wastewater from a printing and dyeing company figure 1 The process of treatment, the concentration of antimony in the antimony-containing printing and dyeing wastewater is 2525.4μg / L, including the following steps:

[0046] (1) The antimony-containing printing and dyeing wastewater enters the reaction tank from the regulating tank, and the hydrochloric acid dissolved in ferrous sulfate and potassium permanganate is mixed and added in the reaction tank. The dosage of ferrous sulfate is the quality of antimony in the antimony-containing printing and dyeing wastewater. The concentration is 71.3 times, that is 180ppm, the dosage of potassium permanganate is 0.56 times of the dosage of ferrous sulfate, that is 100ppm, and then slaked lime and anionic polyacrylamide (PAM, Henan Haiyun Environmental Protection Tech...

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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 control by the US Environmental Protection Agency (USEPA) and the European Union (EU). With the rapid development of the textile, printing and dyeing industries and the widespread application of antimony and its compounds in the industry, the emission and pollution of heavy metal antimony has become increasingly serious. In 2015, the revised "Discharge Standard of Water Pollutants for Textile Dyeing and Finishing Industry" (GB 4287-2012) requires that: at the total wastewater discharge outlet of the enterprise, the standard direct discharge an...

Claims

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Application Information

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Patent Type & Authority Applications(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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