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Treatment method of mercury-containing wastewater

A treatment method and wastewater technology, which is applied in water/sewage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems such as difficult discharge of wastewater in a stable manner and difficulty in solid-liquid separation, achieving obvious Economic and environmental benefits, improved precipitation conditions, and good filtration performance

Inactive Publication Date: 2017-05-24
SICHUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the level of cleaner production in mercury-related industries has generally improved, the concentration of mercury in wastewater has also become lower and lower (several milligrams per liter to tens of milligrams per liter), resulting in very fine sediments produced by chemical precipitation, and some Colloidal substances are produced, and solid-liquid separation is difficult, making it difficult for the treated wastewater to be discharged stably and up to standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Treating 50L of simulated wastewater (composition: Hg12.3mg / L, pH1.8). Treatment conditions: adding 1000 mg of mercury removal residue per liter of wastewater, adding thioacetamide and sodium sulfide to 3% and 105% of the theoretical amount respectively, precipitation reaction time 8 minutes, pH 6, stirring speed 30r / min, input per liter of wastewater The ultrasonic power is 4W, and the precipitation time is 1.0h. The components of the treated wastewater are: Hg0.0004mg / L, pH6.8.

Embodiment 2

[0017] Example 2: Daily treatment of laboratory wastewater 20m 3 (Ingredient: Hg3.2mg / L, pH2.2,). Treatment conditions: add 1200g of mercury removal residue per cubic meter of wastewater, add thioacetamide and sodium sulfide to 5% and 100% of the theoretical amount respectively, settling reaction time 10min, pH6.5, stirring speed 20r / min, input The ultrasonic power per cubic meter of wastewater is 2kW, and the settling time is 2.0h. The components of the treated wastewater are: Hg0.0003mg / L, pH7.1.

Embodiment 3

[0018] Example 3: Treatment of 50 L of mercury smelting water sealing and washing wastewater (composition: Hg 315 mg / L, pH 3.1). Treatment conditions: adding 500 mg of mercury removal residue per liter of wastewater, adding thioacetamide and sodium sulfide to 4% and 108% of the theoretical amount respectively, precipitation reaction time 15min, pH 6.5, stirring speed 20r / min, input per The ultrasonic power of 1 liter of wastewater is 3W, and the settling time is 1.0h. The components of the treated wastewater are: Hg0.0006mg / L, pH7.6.

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Abstract

A treatment method of mercury-containing wastewater, disclosed in the invention, is characterized in that mercury in wastewater is precipitated under a mercury residue removal provided nucleation condition under the action of ultrasonic waves by using thioacetamide and sodium sulfide as a precipitating agent. Treated wastewater is discharged after stably reaching standards.

Description

technical field [0001] The invention relates to a method for treating mercury-containing wastewater. Background technique [0002] Mercury is an important industrial raw material, and its extraction, chemical production and use generate mercury-containing wastewater. Mercury is very toxic. If mercury-containing wastewater is discharged into the environment without treatment, it will cause serious environmental pollution. At present, the treatment methods of mercury-containing wastewater mainly include chemical precipitation, adsorption and membrane separation. Among them, the chemical precipitation method is the most widely used due to its low cost. As the level of cleaner production in mercury-related industries has generally improved, the concentration of mercury in wastewater has also become lower and lower (several milligrams per liter to tens of milligrams per liter), resulting in very fine sediments produced by chemical precipitation, and some Colloidal substances ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F1/66C02F1/36
CPCC02F1/62C02F1/36C02F1/66C02F2001/007C02F2301/046
Inventor 龙炳清刁剑曾凡芸
Owner SICHUAN NORMAL UNIV