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A process for treating heavy metal wastewater by using fly ash

A heavy metal, fly ash technology, applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of increased production cost, large amount of adsorbent, and utilization of adsorbent adsorption capacity. Low rate and other problems, to achieve the effect of convenient operation, simple process, easy promotion and implementation

Inactive Publication Date: 2019-07-23
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in this process, the utilization rate of the adsorption capacity of the adsorbent is low, resulting in a large amount of adsorbent used and an increase in production cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The fly ash used in embodiment 1, embodiment 2 and comparative example is made up of the component of following percentage by weight: SiO 2 : 52.87%; Al 2 o 3 : 24.19%; Fe 2 o 3 : 8.33%; CaO: 3.67%; K 2 O: 1.45%; MgO: 1.03%; SO 3 : 0.77%; TiO 2 : 0.74%; Impurities: 6.95%.

[0023] Example 1

[0024] A process for efficiently treating heavy metal wastewater using fly ash, comprising the following steps:

[0025] (1) start: first add in the reactor that the pH value is 6.2, the volume is 1L, the concentration of nickel is 10.07mg / L heavy metal waste water and the quality is 4g of fly ash, stirring makes its adsorption reach balance;

[0026] (2) Dosing: After adding 1.6g of fly ash to the reactor, stir to make it reach adsorption equilibrium, and obtain effluent with a nickel concentration of 0.47mg / L, and then remove it from the reactor by precipitation separation. Discharge water with a volume of 0.4L;

[0027] (3) Influent: in the reactor, supplement volume i...

Embodiment 2

[0031] A process for efficiently treating heavy metal wastewater using fly ash, comprising the following steps:

[0032] (1) Start-up: first add to the reactor a pH value of 6.2, a volume of 1L, a nickel concentration of 10.07mg / L of heavy metal waste water and a quality of 3.6g of fly ash, stirring to make its adsorption reach equilibrium;

[0033] (2) Dosing: After adding 2.52g of fly ash to the reactor, stir to make it reach adsorption equilibrium, and obtain effluent with a nickel concentration of 0.48mg / L, and then remove it from the reactor by precipitation separation. Discharge water with a volume of 0.7L;

[0034] (3) Influent: in the reactor, replenishing volume is 0.7L, the concentration of nickel is the heavy metal waste water of 10.07mg / L, and the concentration of nickel in the reactor is 7.19mg / L this moment, continue to throw in the step (2) The added fly ash undergoes an adsorption reaction, and after reaching the adsorption equilibrium, the pretreated water wi...

Embodiment 3

[0038] A process for efficiently treating heavy metal wastewater using fly ash, comprising the following steps:

[0039] (1) Start-up: first add to the reactor a pH value of 6.0, a volume of 1L, a copper concentration of 10.01mg / L of heavy metal waste water and a quality of 3.9g of fly ash, stirring to make its adsorption reach equilibrium;

[0040] (2) Dosing: After adding 1.95g of fly ash to the reactor, stir to make it reach adsorption equilibrium, and obtain effluent with a copper concentration of 0.45 mg / L, and then remove it from the reactor by precipitation separation. Discharge water with a volume of 0.5L;

[0041] (3) Influent water: add to the reactor volume 0.5L, the concentration of copper is 10.01mg / L waste water, at this moment the concentration of copper in the reactor is 5.23mg / L, continue to add in step (2) The fly ash carried out the adsorption reaction, and the concentration of copper obtained after reaching the adsorption equilibrium is 1.5mg / L pretreated ...

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PUM

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Abstract

The invention provides a technique for efficiently treating heavy metal wastewater by utilizing coal ash. The technique comprises the following steps: (1) starting; (2) dosing; (3) feeding water; (4) repeating the steps (2) and (3), thereby continuously obtaining water. Compared with a present adsorption technique, the technique for efficiently treating heavy metal wastewater by utilizing coal ash has the advantages that the dosage of the coal ash can be reduced by above 20% when a same heavy metal treatment effect is achieved, above 20% of drug treating cost can be further saved, the technique is simple, the operation is convenient and the technique is convenient to popularize and implement.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a process for efficiently treating heavy metal wastewater by using fly ash. Background technique [0002] With the rapid development of industry and the concentration of urban population, the discharge of heavy metal wastewater is increasing. However, heavy metal pollution cannot be eliminated through biodegradation, thus posing a serious threat to the water environment on which human beings depend. Common heavy metal removal methods include air flotation, precipitation, electrochemical, electrodialysis, membrane, centrifugal exchange, vacuum distillation, etc. However, these methods have disadvantages, such as complicated pretreatment, cumbersome operation, especially the large dosage of chemicals, resulting in high treatment costs and difficulties in implementation. [0003] In the existing process of treating heavy metal wastewater by adsorption method, the adsorbent and heavy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28
CPCC02F1/281
Inventor 于俊利韩非
Owner HEBEI UNIV OF TECH