A treatment process for lead-containing wastewater

Abstract

The invention discloses a treatment process of lead-containing wastewater. The treatment process comprises steps of wastewater filtration, adjustment of a pH value, adsorption by a modified montmorillonite heavy metal adsorbent, secondary filtration, inspection and emission of wastewater and the like. The treatment process of the wastewater containing heavy metal lead is simple and has a good effect, the treated wastewater can meet the emission standard, a preparation process of the adopted modified montmorillonite heavy metal adsorbent is simple and easy to implement, and the adopted modified montmorillonite heavy metal adsorbent can be reused through simple treatment after being used for treating the wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment process for lead-containing wastewater. Background technique [0002] Lead is often used as a raw material in manufacturing industries such as batteries, electroplating, pigments, rubber, pesticides, and fuels. The acid wastewater (pH = 3) discharged from the lead plate manufacturing process has the highest lead concentration, and the wastewater produced by electroplating waste liquid also has a high lead concentration. Lead is an element widely distributed in nature and one of the elements commonly used in industry. Both lead and soluble lead salts are toxic, and lead-containing wastewater is harmful to human health and animal and plant growth. If the daily intake of lead exceeds 0.3-1.0 mg, it can accumulate in the human body, causing anemia, neuritis, etc. With the rapid development of industrial technology, the heavy metal lead in industrial wastew...

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Problems solved by technology

However, there are also many deficiencies, such as electrolysis, although the effect of removing heavy metal lead ions is not bad, but in the process of treatment, especially in the treatment of a large amount of wastewater, a large amount of electric energy will be consumed, and its energy consumption is relatively large, which is difficult to meet the current requirements. The requirements for energy saving and emission reduction advocated; precipitation method, precipitation method can usually be divided into chemical precipitation and physical precipitation. Chemical precipitation is to add a large amount of alkali to the wastewater to make the wastewater alkaline, and then generate insoluble sediment. After filtration, the physical method is to add flocculant to the wastewater containing heavy metals. Most of the flocculants are colloids, which use a large number of similar charges on their surface to absorb heavy metal ions, and then settle by gravity and then remove them by filtration; ion exchange method and adsorption method, Although the operation is simple and the energy consumption is small, there is also the problem that the effect of a single method is not good.