Treatment method of dyestuff wastewater containing heavy metals

A dye wastewater and treatment method technology, which is applied in textile industry wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of not considering the removal effect of heavy metal salts, achieve simple operation, reduce treatment cost, The effect of simple reaction conditions

Inactive Publication Date: 2017-11-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent does not take into account the effect of flocculation on the removal of heavy metal salts in dye wastewater, and requires secondary treatment of sludge generated by two-stage series flocculation

Method used

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  • Treatment method of dyestuff wastewater containing heavy metals
  • Treatment method of dyestuff wastewater containing heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 100mL and contain 100mg / L Cu 2+ ions and 50mg / L methylene blue mixed solution, adding a certain amount of ferrous sulfate to it to make Fe in the mixed solution 2+ The concentration of the mixture is 300mg / L, stirring at a certain speed (200r / min) at 70°C, adjusting the pH to 6 with NaOH, and reacting for 5min. After sampling through a 0.45 μm filter membrane, the concentration of methylene blue in the solution was measured by an ultraviolet spectrophotometer, and the concentration of Cu and Fe ions in the mixed solution was measured by ICP-OES.

[0026] The measurement results are shown in Table 1.

Embodiment 2

[0028] Take 100mL while containing 550mg / L Mn 2+ ions and 200mg / L of tartrazine mixed solution, adding a certain amount of ferrous sulfate to it to make Fe in the mixed solution 2+ The concentration of the mixture is 1200mg / L, stirred at a certain speed (250r / min) at 20°C, adjusted to pH 7 with KOH, and reacted for 15min. After magnetic separation, pass through a 0.45 μm filter membrane, and use an ultraviolet spectrophotometer to measure the concentration of methylene blue in the solution. The concentrations of Mn and Fe ions in the mixed solution were measured by ICP-OES.

[0029] The measurement results are shown in Table 1.

Embodiment 3

[0031] Take 100mL and contain 1200mg / L Cu 2+ ion and 200mg / L of crystal violet mixed solution, adding a certain amount of ferrous chloride to it to make Fe in the mixed solution 2+ The concentration of the mixture is 1200 mg / L, stirring at a certain speed (200 r / min) at 15°C, adjusting the pH to 9 with KOH, and reacting for 15 minutes. After centrifugation, pass through a 0.45 μm filter membrane, and measure the concentration of methylene blue in the solution with an ultraviolet spectrophotometer. The concentrations of Cu and Fe ions in the mixed solution were measured by ICP-OES.

[0032] The measurement results are shown in Table 1.

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Abstract

The invention discloses a treatment method of dyestuff wastewater containing heavy metals. The method comprises under a stirring condition, adding Fe<2+> into to-be-processed dyestuff wastewater which contains heavy metals and adjusting the pH value to a range of 4-10, performing a reaction for 1-15 min, and performing solid-liquid separation. The method provided by the invention requires an extremely short time for treating the dyestuff wastewater, and can rapidly reach a goal of removal. The method uses a ferrite method for metallic oxide generation, and can effectively remove dyestuffs and the heavy metals in the wastewater at the same time. The generated metallic oxides have a certain recovery value, so that costs can be recovered and resource recovery and reuse can be realized. The purity requirement of Fe<2+> used by the method is not high, and heavy metal wastewater which is rich in Fe<2+> can be used to replace added ferrous salts to realize using waste to treat waste, so that treatment cost is reduced greatly. The method has a very simple reaction condition, can be performed at normal temperature under a common pressure, and has a simple and convenient operation.

Description

technical field [0001] The invention belongs to the technical field of sewage and wastewater treatment, and in particular relates to a treatment method for wastewater containing heavy metal dyes. Background technique [0002] With the development of the dye industry, synthetic dyes have been widely used, such as in textile, paper, leather, food processing, plastics, cosmetics, rubber, printing and dye manufacturing industries. According to the latest statistical data, there are more than 100,000 types of commercial dyes, with a total annual output of 9×10 5 tons per year, 10% to 15% of which will be released into the environment, posing a huge threat to the ecological environment and human health. In addition to high chroma, these dye wastewaters also contain various heavy metal salts with complex components and strong toxicity. Once the heavy metals in the dye wastewater are released into the environment, they will exist in the water body and soil for a long time, and wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F103/30
CPCC02F1/001C02F1/66C02F1/705C02F9/00C02F2101/20C02F2101/308C02F2103/30
Inventor 石宝友韩昆郝昊天
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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