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Method for treatment of wastewater containing heavy metal molybdenum

A treatment method and heavy metal technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., to achieve the effect of reducing the content of heavy metal molybdenum, good economic benefits, and reducing treatment costs

Active Publication Date: 2010-12-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, it is still suitable to use the chemical precipitation method in the treatment of heavy metal molybdenum-containing wastewater. The chemical precipitation method has a stable treatment effect for heavy metal wastewater. However, there is no use of adding sulfide precipitation to treat heavy metal molybdenum in the published patents. The hydrogen sulfide gas generated during the reaction can be solved by sealing the device and absorbing it with lye. After a large number of experiments, it has also been proved that this method is very effective for the removal of heavy metal molybdenum.

Method used

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  • Method for treatment of wastewater containing heavy metal molybdenum
  • Method for treatment of wastewater containing heavy metal molybdenum

Examples

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Effect test

Embodiment 1

[0021] Prepare a solution containing molybdenum 100 mg / L, add sodium sulfide at a molar ratio of 1:3 between molybdenum and sodium sulfide, adjust the pH value of the solution to 2, react at room temperature for 2 hours, and add flocculant to the resulting solution And stir quickly, let stand for 5 minutes, drain the supernatant on the sediment and filter. Adjust the pH value of the filtered solution to a neutral condition, add a mixed coagulant of polyaluminum chloride and ferrous sulfate and stir rapidly, let stand for 2 minutes, drain the supernatant on the sediment and filter.

Embodiment 2

[0023] Prepare a solution containing 100 mg / L of molybdenum, add sodium sulfide at a molar ratio of 1:3 between molybdenum and sodium sulfide, adjust the pH value of the solution to 2, react at room temperature for 3 hours, and add flocculant to the obtained solution And stir quickly, let stand for 5 minutes, drain the supernatant on the sediment and filter. Adjust the pH value of the filtered solution to a neutral condition, add a mixed coagulant of polyaluminum chloride and ferrous sulfate and stir rapidly, let stand for 2 minutes, drain the supernatant on the sediment and filter.

Embodiment 3

[0025] Prepare a solution containing 100 mg / L of molybdenum, add sodium sulfide at a molar ratio of 1:6 between molybdenum and sodium sulfide, adjust the pH value of the solution to 2, react at room temperature for 2 hours, and add flocculant to the resulting solution And stir quickly, let stand for 5 minutes, drain the supernatant on the sediment and filter. Adjust the pH value of the filtered solution to a neutral condition, add a mixed coagulant of polyaluminum chloride and ferrous sulfate and stir rapidly, let stand for 2 minutes, drain the supernatant on the sediment and filter.

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Abstract

The invention belongs to the technical field of water treatment, in particular to a method for treatment of wastewater containing heavy metal molybdenum. The specific steps are as follows: placing the wastewater which needs to be treated and contains the heavy metal molybdenum into a sealing device; adding sodium sulfide into the device, controlling the pH value of the wastewater after adding the sodium sulfide at 2-3, carrying out reaction for 1-3h at room temperature, and continuously adding the generated sodium sulfide into the molybdenum-containing wastewater for recycling; adding a flocculant into the obtained solution, stirring, carrying out the reaction, standing till precipitate is settled, then discharging supernatant fluid, and passing through a filter device, wherein the precipitate of molybdenum sulfide can be recycled after collection treatment; and adding a mixed coagulant till the pH value of the obtained acid solution is neutral, stirring for removing redundant sulfide ions, standing for 2-5 min till the precipitate is settled, and then discharging the supernatant fluid for ensuring water quality of outlet water. The method for the treatment of the wastewater containing the heavy metal molybdenum has the prominent advantages of good treatment effect, simple treatment equipment, low treatment cost, recycling and utilization of the metal molybdenum and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to the treatment of waste water or sewage, in particular to a treatment method for waste water containing heavy metal molybdenum. Background technique [0002] With the rapid development of modern industry, the discharge of heavy metal industrial wastewater is increasing day by day. In addition to the traditional mining, natural gas, papermaking, electroplating, tanning, metal surface treatment and chlor-alkali industries, the industries that discharge heavy metal wastewater also include the microelectronics industry that is closely related to the current IT industry, and the environmental protection industry. Heavy metal (mercury, cadmium, lead, chromium, etc.) wastewater is still highly toxic even at low concentrations. Therefore, many countries have implemented strict discharge standards for heavy metal ions in water to protect water resources from heavy metal pollution....

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/52C02F1/62C02F101/20
Inventor 李风亭张冰如忻少华
Owner TONGJI UNIV
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