Method adopting combined technology of pre-oxidation and coagulating sedimentation to process wastewater containing thallium and ammonia-nitrogen

A technology of ammonia nitrogen wastewater, coagulation and sedimentation, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve difficult to deal with waste gas, waste residue, unsatisfactory effect, treatment process Complexity and other issues, to achieve the effect of reducing the production of disinfectant products, low cost, and simple operation

Inactive Publication Date: 2016-02-03
HUNAN LIHONG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are many conventional methods for treating wastewater containing thallium and ammonia nitrogen. The traditional process of sludge digestion and degradation of ammonia nitrogen requires high investment, large area occupation, and complicated operation; the cost of catalytic oxidation of ammonia nitrogen remover to decompose ammonia nitrogen is too high; the treatment process of thallium is very complicated. The cost is very high, and the effect is not very ideal, and waste gas and waste residue that are difficult to handle will be generated during the treatment process

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1. A method for treating waste water containing thallium and ammonia nitrogen by using a combination of pre-oxidation and coagulation precipitation. The concentration of thallium ions in the waste water is 0.1 mg / L, and the concentration of ammonia nitrogen is 20 mg / L. The specific operation steps are as follows:

[0015] A. Pre-oxidation: first collect the wastewater containing thallium and ammonia nitrogen into the wastewater collection tank, add quicklime to adjust the pH value of the wastewater containing thallium and ammonia nitrogen to 5-6, and then add 12% sodium hypochlorite as an oxidant to the wastewater for collection In the pool, 1m 3 Add 3L of sodium hypochlorite to the wastewater containing thallium and ammonia nitrogen, and then stir for 20 minutes to fully mix and react the sodium hypochlorite and wastewater, and fully oxidize the metal ions in the wastewater, especially monovalent thallium, to trivalent thallium. A complex is formed under the...

Embodiment 2

[0019] Embodiment two, a kind of method that adopts pre-oxidation and coagulation sedimentation combination to process the method that contains thallium, ammonia nitrogen wastewater, the thallium ion concentration in the wastewater is 2.5mg / L, and the ammonia nitrogen concentration is 75mg / L, and its specific operation steps are as follows:

[0020] A. Pre-oxidation: first collect the wastewater containing thallium and ammonia nitrogen into the wastewater collection tank, add quicklime to adjust the pH value of the wastewater containing thallium and ammonia nitrogen to 5-6, and then add 12% sodium hypochlorite as an oxidant to the wastewater for collection In the pool, 1m 3 Add 19L of sodium hypochlorite to the wastewater containing thallium and ammonia nitrogen, and then stir for 28 minutes to fully mix and react the sodium hypochlorite and wastewater, and fully oxidize the metal ions in the wastewater, especially monovalent thallium, to trivalent thallium. A complex is forme...

Embodiment 3

[0024] Embodiment three, a kind of method that adopts pre-oxidation and coagulation sedimentation combination to process the method that contains thallium, ammonia nitrogen wastewater, the thallium ion concentration in the wastewater is 5mg / L, and the ammonia nitrogen concentration is 150mg / L, and its specific operation steps are as follows:

[0025] A. Pre-oxidation: first collect the wastewater containing thallium and ammonia nitrogen into the wastewater collection tank, add quicklime to adjust the pH value of the wastewater containing thallium and ammonia nitrogen to 5-6, and then add 12% sodium hypochlorite as an oxidant to the wastewater for collection In the pool, 1m 3 Add 38L of sodium hypochlorite to the waste water containing thallium and ammonia nitrogen, and then stir for 30 minutes to fully mix and react the sodium hypochlorite and waste water, fully oxidize the metal ions in the waste water, especially the monovalent thallium to trivalent thallium, and the monovale...

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Abstract

The invention discloses a method adopting a combined technology of pre-oxidation and coagulating sedimentation to process wastewater containing thallium and ammonia-nitrogen. According to the method, a sodium hypochlorite oxidizing agent is added into a wastewater collecting tank so as to oxidize metal ions in wastewater, the monovalent thallium is fully oxidized into trivalent thallium, monovalent thallium is converted into complex under the effect of strong oxidant, and at the same time, the nitrogen in ammonia-nitrogen is degraded and removed in the form of nitrogen gas. After pre-oxidation, the wastewater is lifted to an integral processing facility through a self-sucking pump; ferrous sulfate and poly aluminum chloride (PAC) are added to form alumen ustum flocculus in a precipitation unit, the precipitate is wrapped, the thallium complex is adsorbed, then quicklime is added to adjust the solution to an alkaline environment; in the alkaline environment, Fe<3+>, Al<3+>, and prepolymer products thereof carry out hydrolysis quickly to form Fe(OH)3 flocculus and Al(OH)3 flocculus; before the flocculus becomes big, the adsorption sites on the surface of flocculus form covalent bonds with Ti<3+>, the flocculus becomes bigger and bigger very quickly and goes on absorbing Ti<3+> in water; at the same time, Ti<3+>, Fe<3+>, Al<3+>, Zn<2+>, lead, and cadmium carry out co-precipitation reactions, and thus the heavy metal ions in water are removed.

Description

technical field [0001] The invention relates to the technical field of chemical wastewater treatment, in particular to a method for treating wastewater containing thallium and ammonia nitrogen by using a combination of pre-oxidation and coagulation sedimentation. Background technique [0002] At present, there are many conventional methods for treating wastewater containing thallium and ammonia nitrogen. The traditional sludge digestion and degradation ammonia nitrogen process requires high investment, large area occupation, and complicated operation; the cost of ammonia nitrogen removal by catalytic oxidation and decomposition of ammonia nitrogen is too high; the treatment process of thallium is very complicated. The cost is very high, and the effect is not very satisfactory, and waste gas and waste residue that are difficult to handle will be generated during the treatment process. Contents of the invention [0003] The purpose of the present invention is to overcome the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
Inventor 李才发
Owner HUNAN LIHONG NEW MATERIAL TECH CO LTD
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