Membrane treatment technique of low-concentration heavy metal wastewater

A low-concentration heavy metal and membrane treatment technology, applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of low system energy consumption, low interception efficiency, and slow processing speed

Inactive Publication Date: 2018-11-27
湖南湘牛环保实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ultrafiltration membrane purification technology has a high system recovery rate, which can realize high-efficiency separation, purification and high-fold concentration of materials. There is no phase change in the treatment process, and the process of separation, purification and concentration is always at normal temperature. The system has low energy consumption and short production cycle. , but the heavy metal wastewater is directly treated by the ultrafiltration membrane, the treatment speed is slow, the interception efficiency is low, the service life of the ultrafiltration membrane is reduced, and the heavy metal ions are not conducive to the recovery

Method used

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  • Membrane treatment technique of low-concentration heavy metal wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Up to the standard "GB8978-1996 Comprehensive Wastewater Discharge Standard" Industrial sewage (Ni 0.98mg / L, Cd 0.11mg / L, Pb1.01mg / L, Sb 0.51mg / L) 1000ml, add 20mg / L flocculant, after solid-liquid separation , add agglomerating agent in filtrate, agglomerating agent comprises sodium dodecylbenzene sulfonate (C1 2 h 25 -C 6 h 4 -SO 3 Na) 5g, polyaluminum chloride [Al 2 (OH) n Cl 6-n ·xH 2 O] m , (m≦10, 3~5, Al 2 o 3 ≧28.0%) 30g, dimethyldiallyl sodium chloride 5g, diatomaceous earth 10g, stir with a stirrer at normal temperature and pressure, the speed of the stirrer is 60r / min, the stirring time is 60min, and the standing time is 8h. Pumped into the ultrafiltration membrane separator for filtration, permeate sampling analysis, Ni 0.29mg / L, Cd 0.03mg / L, Pb 0.26mg / L, Sb 0.02mg / L, up to standard discharge, sampling analysis in the concentrated solution, Ni 0.29g / L, Cd 0.03g / L, Pb 0.26g / L, Sb 0.02g / L, add a dispersant to the concentrated solution, adjust the pH v...

Embodiment 2

[0026] Up to the standard "GB8978-1996 Comprehensive Wastewater Discharge Standard" Industrial sewage (Ni 0.98mg / L, Cd 0.11mg / L, Pb1.01mg / L, Sb 0.51mg / L) 1000ml, add 15mg / L flocculant, after solid-liquid separation , add agglomerating agent in filtrate, agglomerating agent comprises sodium dodecylbenzene sulfonate (C1 2 h 25 -C 6 h 4 -SO 3 Na) 5g, polyaluminum chloride [Al 2 (OH) n Cl 6-n ·xH 2 O] m , (m≦10, 3~5, Al 2 o 3 ≧28.0%) 55g, dimethyldiallyl sodium chloride 5g, diatomaceous earth 25g, stir with a stirrer at normal temperature and pressure, the speed of the stirrer is 60r / min, the stirring time is 60min, and the standing time is 8h. Pumped into the ultrafiltration membrane separator for filtration, permeate sampling analysis, Ni 0.11mg / L, Cd 0.01mg / L, Pb 0.12mg / L, Sb 0.01mg / L, up to standard discharge, sampling analysis in the concentrated solution, Ni 0.39g / L, Cd 0.13g / L, Pb 0.46g / L, Sb 0.05g / L, add a dispersant to the concentrated solution, adjust the pH v...

Embodiment 3

[0028] Up to standard "GB8978-1996 Comprehensive Sewage Discharge Standard" Industrial sewage (Ni 0.98mg / L, Cd 0.11mg / L, Pb1.01mg / L, Sb 0.51mg / L) 1000ml, add 10mg / L flocculant, after solid-liquid separation , add agglomerating agent in filtrate, agglomerating agent comprises sodium dodecylbenzene sulfonate (C1 2 h 25 -C 6 h 4 -SO 3 Na) 5g, polyaluminum chloride [Al 2 (OH) n Cl 6-n ·xH 2 O] m , (m≦10, 3~5, Al 2 o 3≧28.0%) 25g, dimethyldiallyl sodium chloride 5g, diatomaceous earth 10g, stir with a mixer at normal temperature and pressure, the speed of the mixer is 60r / min, the stirring time is 60min, and the standing time is 8h. Pumped into the ultrafiltration membrane separator for filtration, permeate sampling analysis, Ni 0.22mg / L, Cd 0.03mg / L, Pb 0.23mg / L, Sb 0.02mg / L, up to standard discharge, sampling analysis in the concentrate, Ni 0.31g / L, Cd 0.03g / L, Pb 0.29g / L, Sb 0.02g / L, add a dispersant to the concentrated solution, adjust the pH value to 9-11, and use a...

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Abstract

A membrane treatment technique of low-concentration heavy metal wastewater comprises pretreatment and ultrafiltration membrane purification; the pretreatment includes: adding a flocculating agent to allow flocculating reaction; adding an agglomerating agent to carry out agglomerating reaction, wherein the agglomerating agent is a mixture of sodium dodecyl benzene sulfonate, polyaluminum chloride,dimethyl diallyl ammonium chloride and diatomite; recycling the heavy metal concentrate ultra-filtered. The pretreatment and ultrafiltration membrane purification are combined; the pretreatment enables large-particle matters in wastewater to be removed by flocculating reaction and enables disperse heavy metal ions in the industrial wastewater to be agglomerated by agglomerating reaction; particlesize of the heavy metal ions is increased; interception rate of heavy metal ions is increased; deep removal of heavy metals is achieved, and wastewater is deeply purified. Industrial purified wastewater that meets the integrated wastewater emission standard GB8978-1996 is used as a treating water source; the content of heavy metals in the purified wastewater is 30% less than that in the corresponding emission level of the integrated wastewater emission standard GB8978-1996.

Description

technical field [0001] The invention relates to a heavy metal wastewater treatment process, in particular to a low-concentration heavy metal wastewater membrane treatment process. Background technique [0002] Heavy metal wastewater pollution includes various heavy metal pollution in electronics / printed circuit boards (PCB), metal plating heavy metal wastewater pollution, metal surface treatment wastewater metal pollution, steel manufacturing wastewater pollution, battery manufacturing nickel-cadmium heavy metal pollution, etc. Others include river surge pollution (such as high sediment concentration in Yellow River water), yin and yang resin softening water concentrate pollution (containing high concentrations of alkali metals and alkaline earth metal substances), high concentrations of COD and BOD substances in soybean products, reverse osmosis RO concentrate Medium and high concentration of anions and cations, etc. [0003] At present, heavy metal wastewater treatment me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/20
CPCC02F1/36C02F1/444C02F1/52C02F1/5236C02F1/54C02F1/547C02F1/66C02F9/00C02F2001/007C02F2101/20
Inventor 贺志勇李先柏方志斌张东方王竞杰汤恕戴慧敏
Owner 湖南湘牛环保实业有限公司
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