Heavy metal sewage treatment process

A treatment process and sewage treatment technology, applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. The chemical properties are stable and the effect of reducing the dosage

Active Publication Date: 2020-04-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the fact that the residual heavy metals discharged from the factory into the municipal sewage plant exist in suspended, free and complex states at the same time, different methods or water treatment chemicals are required to remove heavy metals in different forms, which increases the difficulty of operation; on the other hand, the existing water treatment chemicals In order to achieve the discharge of heavy metals in industrial wastewater, it is often necessary to overdosing, but excessive dosing in municipal sewage will lead to the collapse of the biochemical system on the one hand, and on the other hand, the residual chemicals in the factory water will increase biological toxicity and endanger environmental health; at the same time, urban sewage plants in my country It has covered the whole country, and the sewage plant is limited by space and operating cost control. It does not have the ability to build additional structures to treat heavy metals and cannot use high-cost treatment methods such as electrochemistry and reverse osmosis membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The main process of the treatment facilities of a sewage treatment plant adopts the AAO activated sludge method. The suspended solids in the wastewater entering the plant have a pH value of 6.8. The wastewater contains heavy metals such as copper ions, nickel ions, and manganese ions. The treatment process does not design a heavy metal removal unit. The heavy metals in the effluent exceeded the discharge standard. The present embodiment handles above-mentioned sewage, specifically as follows:

Embodiment approach

[0039]Implementation method: the sewage enters the primary reaction tank, and the water treatment coagulant is added as an iron salt coagulant. The calculation basis for the dosage is: B1 is 600mg / L, Bs is set to 300mg / L, and a is 3; the calculation shows that the sewage enters After treating the primary reaction pool, add water treatment coagulant 9mg / L (iron salt coagulant 9mg / L); stir rapidly for 3min (G value 600s -1 ), stirring slowly for 5min (G value 50s -1 );

[0040] After standing still for 2 hours, after coagulation and sedimentation, the supernatant enters the secondary reaction tank for biochemical treatment, and the heavy metal sewage treatment agent is added to the water outlet drop well at the end of the biochemical treatment. In this example, the dosage of the heavy metal water treatment agent is calculated. Basis: The sum of C1 heavy metals is 0.53mg / L, Cs is set at 0.05mg / L, and k is 30. It is calculated that adding heavy metal water treatment chemicals is ...

Embodiment 2

[0044] The main process of the treatment facilities of a sewage treatment plant adopts the AAO activated sludge method. The suspended solids in the wastewater entering the plant have a pH value of 7.2. The wastewater contains heavy metals such as lead ions, nickel ions, and zinc ions. The treatment process does not design a heavy metal removal unit. The heavy metals in the effluent exceeded the discharge standard. The present embodiment handles above-mentioned sewage, specifically as follows:

[0045] Implementation method: the sewage enters the primary reaction tank, and the water treatment coagulant is added as an aluminum salt coagulant. The calculation basis of the dosage is: B1 is 600mg / L, Bs is set to 300mg / L, a is 3, and the calculated sewage enters the treatment Add water treatment coagulant 9mg / L (dosing amount of aluminum salt coagulant 9mg / L) to the primary reaction tank; stir rapidly for 5min (G value 700s -1 ), stirring slowly for 7min (G value 80s -1 );

[004...

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PUM

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Abstract

The invention belongs to the technical field of sewage treatment, particularly relates to a heavy metal sewage treatment process, and belongs to the technical field of treatment of soluble heavy metals and suspensible heavy metals. The removal rate on heavy metals is 95% or above, and reaches the national emission standard; no influence on a biochemical treatment system is caused, and COD degradation, ammonia nitrogen nitrification and denitrification nitrogen removal functions and effects are not influenced; meanwhile, by adding an effluent guaranteeing agent, the situation that excessive heavy metal sewage treatment agents are possibly added and discharged into the environment along with effluent, and unknown influences are generated on the environment are avoided.

Description

Technical field: [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a heavy metal sewage treatment process. Background technique: [0002] With the rapid development of industries such as electroplating, chemical industry, metal pickling, metallurgy and electronics, industrial wastewater with high concentrations of heavy metals will be produced during production. After the enterprise adopts necessary pollution control facilities, the content of different heavy metals in wastewater can be significantly reduced to the discharge standard of 0.05-5.0 mg / L, but the concentration of heavy metals is still higher than the acceptance limit of municipal sewage treatment plants. Heavy metals are already a part of municipal sewage. important and common pollutants. At the same time, the lack of advanced industrial wastewater treatment technology, illegal discharge and sudden heavy metal pollution accidents directly lead to the heavy met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/22
CPCC02F1/5236C02F1/54C02F1/56C02F1/66C02F9/00C02F2001/007C02F2101/20C02F2101/203C02F2101/206C02F2101/22C02F2209/06C02F2301/08
Inventor 兰华春崔雨琦安晓强刘锐平吉庆华刘会娟曲久辉
Owner TSINGHUA UNIV
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