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Treatment method for heavy-metal-containing wastewater

A treatment method and technology for heavy metals, applied in multi-stage water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of easy oxidation failure, frequent regeneration and high operating costs of ion exchangers

Active Publication Date: 2016-06-15
JINING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ion exchange method is an important treatment method for electroplating wastewater. It has large treatment capacity, good effluent quality, can recycle heavy metal resources, and has no secondary pollution to the environment. However, ion exchangers are prone to oxidation and failure, frequent regeneration, and high operating costs.

Method used

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  • Treatment method for heavy-metal-containing wastewater
  • Treatment method for heavy-metal-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: a kind of processing method that contains heavy metal wastewater, comprises the steps:

[0023] 1) Add the heavy metal adsorbent to the heavy metal-containing wastewater, fully stir or shake for 3 hours; centrifuge the heavy metal adsorbent or leave it to stand until the heavy metal adsorbent precipitates to obtain a supernatant; the amount of the heavy metal adsorbent is 1 / 2 of the weight of the heavy metal-containing wastewater 1%;

[0024] 2) Add a complexing agent to the supernatant of step 1), stir or shake for 2 hours; then add a reducing agent and stir or shake for 2 hours; then adjust the pH value to 12 with sodium hydroxide solution, heat to 65°C, and fully React for 2.5 hours, and carry out solid-liquid separation; the complexing agent is a combination of sodium citrate, sodium edetate and potassium sodium tartrate, and the weight ratio of the three is 1:1:1; The mass ratio of the heavy metal to the complexing agent is 1:5; the reducing agent is...

Embodiment 2

[0028] Embodiment 2 A kind of processing method that contains heavy metal wastewater, comprises the steps:

[0029] 1) Add the heavy metal adsorbent to the heavy metal-containing wastewater, fully stir or shake for 4 hours; centrifuge the heavy metal adsorbent or leave it to stand until the heavy metal adsorbent is precipitated to obtain a supernatant; the amount of the heavy metal adsorbent is 1 / 2 of the weight of the heavy metal-containing wastewater 1.5%;

[0030]2) Add complexing agent to the supernatant of step 1), fully stir or shake for 3 hours; then add reducing agent and stir or shake for 3 hours; then adjust the pH value to 10 with sodium hydroxide solution, heat to 70°C, fully React for 3 hours and carry out solid-liquid separation; the complexing agent is a combination of sodium citrate, sodium edetate and potassium sodium tartrate, and the weight ratio of the three is 1:1:1; the heavy metal in the heavy metal-containing wastewater The mass ratio to the complexing...

Embodiment 3

[0034] Embodiment 3 A kind of processing method that contains heavy metal wastewater, comprises the steps:

[0035] 1) Add the heavy metal adsorbent to the heavy metal-containing wastewater, fully stir or shake for 5 hours; centrifuge the heavy metal adsorbent or leave it to stand until the heavy metal adsorbent is precipitated to obtain a supernatant; the amount of the heavy metal adsorbent is the weight of the heavy metal-containing wastewater 2%;

[0036] 2) Add complexing agent to the supernatant of step 1), fully stir or shake for 2.5h; then add reducing agent and stir or shake for 2.5h; then adjust the pH value to 8 with sodium hydroxide solution, and heat to 75°C , fully reacted for 3 hours, and carried out solid-liquid separation; the complexing agent is a combination of sodium citrate, sodium edetate and potassium sodium tartrate, and the weight ratio of the three is 1:1:1; The mass ratio of the heavy metal to the complexing agent is 1:5; the reducing agent is a comb...

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Abstract

The invention relates to a treatment method for heavy-metal-containing wastewater. The treatment method comprises the following steps: 1) adding a heavy metal adsorbent into the heavy-metal-containing wastewater, and fully stirring or shaking for 2-5 hours; carrying out centrifugal separation on the heavy metal adsorbent, or standing, so that supernatant is obtained after the heavy metal adsorbent is precipitated; 2) adding a complexing agent into the supernatant obtained in the step 1), and fully stirring or shaking for 1-3 hours; adding a reducing agent, and fully stirring or shaking for 1-3 hours; regulating the pH value to be 8-12 with an alkaline solution, heating to 60-80 DEG C, fully reacting for 2-3 hours, and carrying out solid-liquid separation; 3) enabling the liquid obtained in the step 2) to pass through activated CD-180 macroporous adsorption resin, enabling effluent liquid to pass through D61 macroporous cation exchange resin, and collecting effluent liquid; and 4) enabling the effluent liquid obtained in the step 3) to pass through a reverse osmosis cellulose acetate membrane at the pressure of 0.5-2MPa, so that the heavy-metal-containing wastewater is treated. The treatment method has the advantages that the content of target heavy metals in wastewater can be obviously reduced, and removal rates reach more than 90% respectively; and meanwhile, the technology is simple, and the operation is convenient, so that the method has good application prospects.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating wastewater containing heavy metals. Background technique [0002] Heavy metal ions in heavy metal wastewater circulate through groundwater and migrate through soil, causing pollution of drinking water and food, seriously endangering human living environment and life safety. At the same time, as non-renewable resources, it also causes the loss and waste of heavy metal resources. Therefore, the rational recovery and resource utilization of heavy metal ions in industrial wastewater has become one of the energy, environmental protection and economic issues that need to be solved urgently. [0003] At present, the treatment of industrial wastewater containing heavy metals is mainly separation-recovery-reuse (Remove-Recovery-Reuse, referred to as 3R). The separation and recovery of heavy metal ions mainly use chemical precipitation, solvent extraction, and ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/281C02F1/441C02F1/52C02F9/00C02F2001/425C02F2101/20C02F2301/08
Inventor 孙玉红司崇殿韩红刘广军周晶
Owner JINING UNIV
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