Technique for efficiently treating heavy metal wastewater by utilizing coal ash

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...

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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.