Deep treatment method for polluted wastewater containing heavy metal such as thallium and the like

An advanced treatment, heavy metal technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the removal effect of membrane method and biological method, and the applicability of raw materials cannot be widely used. The industrialization promotion of the system, the inability to meet the problems of in-depth treatment, etc., achieve the effect of easy operation and management, less floor space, and simple process flow

Pending Publication Date: 2015-09-23
NANJING GW ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Similarly, membrane and biological methods cannot be widely industrialized due to their removal effects and raw material applicability.
[0009] Now, what we study more is the chemical precipitation method, which mainly involves three types, one is the alkali precipitation method, the other is the sulfide precipitation method, and the other is the chloride precipitation method, but these three treatment methods are all Not only can the concentration of thallium be reduced to 100μg / L, but it cannot meet the advanced treatment and then meet the discharge requirement of 5μg / L

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Preparation of Catalytic Reduction Agents

[0029] Mix 5 parts of iron-containing mixture, 0.1 part of reducing metal element, 0.1 part of reducing carbon-containing substance, 0.1 part of reducing sulfur-containing substance, 0.1 part of reducing zinc-containing substance, and 0.1 part of reducing nitrogen-containing substance to form a reduced Catalyst.

[0030] Mix 99.5 parts of iron-containing mixture, 30 parts of reducing metal element, 15 parts of reducing carbon-containing substance, 20 parts of reducing sulfur-containing substance, 15 parts of reducing zinc-containing substance, and 15 parts of reducing nitrogen-containing substance to form a reduced Catalyst.

[0031] Mix 50 parts of iron-containing mixture, 15 parts of reducing metal element, 7 parts of reducing carbon-containing substance, 10 parts of reducing sulfur-containing substance, 7 parts of reducing zinc-containing substance, and 7 parts of reducing nitrogen-containing substance to form a...

Embodiment 2

[0032] Example 2 Preparation of thallium-removing agent

[0033] Mix the above substances in the manner of 10 parts of sulfide, 0.1 part of calcium chloride, 0.1 part of magnesium oxide, 0.1 part of calcium oxide, 0.1 part of activated carbon, 0.2 part of diatomaceous earth, 0.2 part of attapulgite, 0.1 part of PAM, and 0.1 part of PAC , and further ground to form a particle size of less than 20 mesh mixed powder.

[0034] According to 99 parts of sulfide, 20 parts of calcium chloride, 10 parts of magnesium oxide, 10 parts of calcium oxide, 0.1-10 parts of activated carbon, 0.2-10 parts of diatomite, 0.2-10 parts of attapulgite, 0.1-10 parts of PAM, Mix the above materials by 0.1-10 parts of PAC, and further grind to form a mixed powder with a particle size of less than 20 mesh.

[0035] Mix the above substances in the manner of 50 parts of sulfide, 10 parts of calcium chloride, 5 parts of magnesium oxide, 5 parts of calcium oxide, 5 parts of activated carbon, 5 parts of di...

Embodiment 3

[0037] Detect the contents of various heavy metal ions in the industrial wastewater containing heavy metals such as thallium, among which the content of thallium element is 17450μg / L, the content of mercury element is 20.03μg / L, and the content of lead element is 8.77μg / L. Measure 1000ml of industrial wastewater, adjust the pH of the wastewater to 2 with hydrochloric acid, add any reducing catalyst agent configured in Example 1, the addition amount is 20g / L, stir for 60 minutes, suction filter, add Example 2 to the solution Prepare any thallium-removing agent in the mixture, stir for 60 minutes, and filter with suction to remove the precipitate. ICP-MS was used to test the water quality of the wastewater to be discharged. The content of thallium element in the water was 2.04 μg / L, the content of mercury element was 2.76 μg / L, and the content of lead element was 4.43 μg / L.

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Abstract

The invention belongs to the technical field of wastewater treatment, especially relates to the field of deep treatment of associated polluted wastewater containing heavy metal such as thallium, mercury, lead and the like in the industries of steel and iron, lead and zinc smelting, copper smelting and the like, and particularly relates to a deep treatment method for the polluted wastewater containing the heavy metal such as thallium and the like. In order to meet the newest emission standards, the invention discloses the deep treatment method for the polluted wastewater containing the heavy metal such as thallium and the like. The method comprises three steps of acidic reduction, thallium-removing agent precipitation and filtration. With the method, the thallium concentration can be reduced to less than 5 mcg / L and the thallium, mercury and lead emission standard limited values specified in <Inorganic chemical industrial pollutant emission standards> (GB31573-2015) can be satisfied.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to the field of advanced treatment of heavy metal-contaminated wastewater containing thallium in iron and steel, lead-zinc, copper and other associated industries, and specifically relates to an advanced treatment method of heavy metal-containing wastewater such as thallium. Background technique [0002] Thallium (Tl) is a typical rare dispersed element. Thallium and its compounds are highly toxic, much higher than arsenic oxide, and have obvious effects on the gastrointestinal tract and kidneys. Its toxicity to mammals is much greater than that of Elements such as Hg, Pb, As, and thallium compounds are one of the main hazardous wastes listed in the World Health Organization's key restriction list, and are also included in the list of priority pollutants in my country. In October 2010, excessive thallium was found in the middle and upper reaches of the Beijiang River in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F1/62
Inventor 韩正昌高亚娟王志磊马军军潘瑞松崔洪磊韩思宇
Owner NANJING GW ENVIRONMENT ENG
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