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Heavy metal thallium-containing sewage purification treatment method

A technology of sewage purification and treatment method, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of reducing the amount of ozone

Pending Publication Date: 2022-07-22
湖南碧汇泉环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of unsatisfactory treatment of thallium-containing sewage in the prior art and the need to use excessive sodium sulfide, the present invention provides a method for purifying sewage containing heavy metal thallium, comprising the following steps:

Method used

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Effect test

Embodiment 1

[0023] Using the fly ash of the iron and steel plant as the raw material for producing zinc sulfate, the main components of the fly ash are zinc oxide, potassium chloride and sodium chloride. The content of sodium chloride and potassium chloride in the sewage to be treated reaches 22%, the content of thallium ions reaches 100 mg / L, and the content of iron ions reaches 230 mg / L. at 30m 3 In the stainless steel reaction kettle, add the above-mentioned sewage 20m 3 , first adjust the pH value to 11 with 10% concentration of hydrogen peroxide, start the reaction kettle to stir, slowly add 120kg of sodium sulfide solution concentrated to 25% under stirring, react at normal temperature and pressure for 60min, then filter with plate and frame Filter by machine pressure, the obtained filtrate contains 0.9 mg / L of thallium ions and 186 mg / L of ferrous ions. The filtrate was sent into the oxidation tower with a pump and oxidized with ozone for 5 hours, and the total amount of ozone ad...

Embodiment 2

[0025] Zinc sulfate is produced from smelter waste residue as raw material. The main components of this waste residue are zinc oxide and sodium chloride. The sewage generated after the raw material is washed in countercurrent is used as the sewage to be treated in this embodiment, and the sodium chloride in the sewage to be treated in this embodiment is The content reaches 25%, the thallium ion content reaches 60mg / L, and the iron ion content reaches 260mg / L. 3 In the stainless steel reaction kettle, add the above-mentioned sewage 20m 3 , first adjust the pH value to 12 with the concentration of 10% hydrogen peroxide, start the reaction kettle to stir, slowly add 70kg of sodium sulfide solution concentrated to 25% under stirring, react at normal temperature and pressure for 30min, then filter with plate and frame Filter by machine pressure, the obtained filtrate contains 1.3 mg / L of thallium ions and 216 mg / L of iron ions. The filtrate was sent into the oxidation tower with a...

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Abstract

The invention discloses a heavy metal thallium-containing sewage purification treatment method, which comprises: adjusting the pH value of the sewage to 11-12 by using sodium hydroxide, and adding a proper amount of sodium sulfide according to the thallium ion content in the sewage to be treated to make the monovalent thallium ions in the sewage become thallium sulfide precipitate. After filtration, ozone is introduced into filtrate for oxidation, and ferric hydroxide and thallium hydroxide precipitates are generated; and filtering again, carrying out photocatalytic oxidation on the filtrate to generate a water-insoluble substance thallium hydroxide precipitate, and finally filtering to obtain qualified clear filtrate. The content of iron ions in the clear filtrate is smaller than 0.0005 mg / L, and the content of heavy metal thallium ions in the clear filtrate is smaller than 0.0001 mg / L. Finally, the clear filtrate is sent to a concentration crystallizer to be concentrated and crystallized, and a high-quality inorganic salt product meeting the national standard is obtained.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for purifying sewage containing heavy metal thallium. Background technique [0002] The heavy metal thallium is a highly toxic chemical, and thallium and cyanide are both Class A in the People's Republic of China's "Classification and Product Name Numbering of Extremely Toxic Substances" (implemented on October 1, 1993). Because thallium salt is easily soluble in water, the content of thallium in vegetables, meat, eggs and other foods in industrially polluted areas is 700-4000 times that in water and soil. Thallium is mainly absorbed into the human body through drinking water and food from the digestive tract, or it is inhaled by the respiratory tract in the form of dust, or it is absorbed by contact with the skin in the form of a vapor-like compound. Thallium can accumulate in the organism for several years, causing chronic thallium poisoning. Thallium and its compound...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F101/20
CPCC02F9/00C02F1/001C02F1/5236C02F1/66C02F1/78C02F1/725C02F1/444C02F1/32C02F2101/20C02F2305/023
Inventor 陈艺何瑶瑶何韵淋贺杰晏永祥
Owner 湖南碧汇泉环保科技有限公司
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