Method and device for continuously treating heavy metal polluted sludge

Abstract

The invention discloses a method and device for continuously treating heavy metal polluted sludge, belongs to the field of solid waste treatment. The method comprises the following steps: S1, closinga cathode chamber and the like, and opening an underwater electromagnetic valve and the like; S2, turning on an ultrasonic generator; S3, switching on a power supply, and starting electrolysis; S4, reacting for precipitation; S5, performing in a filtering chamber; S6, starting a first sewage pump to start feeding and discharging; S7, opening a gas valve to release hydrogen; S8, closing the underwater electromagnetic valve, a third sewage pump, a leaching valve and a drainage valve, and opening a second sewage pump and a backwashing valve; and S9, closing the backwashing valve, and opening thedrainage valve. Heavy metals adsorbed and wrapped by sludge can be effectively treated, sludge odor can be removed, and sludge harmless treatment is achieved; metals such as copper and zinc in the sludge are recycled; and harmless treatment of the heavy metal polluted sludge can be realized without additional chemicals.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method and device for continuously treating heavy metal polluted sludge. Background technique [0002] With the rapid advancement of my country's urbanization process, my country has put forward higher requirements for the quantity and quality of urban sewage treatment plants. However, most sewage treatment plants adhere to the attitude of "heavy water and light mud" and do not pay enough attention to the treatment and disposal of sludge. , as a derivative of sewage treatment, sludge production has risen sharply in recent years. In 2015, domestic sludge production was 35 million tons, a year-on-year increase of 16%. In terms of municipal sludge, about 10,000 tons of sewage produce 5-8 tons of sludge, It is estimated that by 2020, my country's municipal sludge output will reach 60-90 million tons. [0003] After the release of the "Water Ten Measures" in 2015, the n...

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Problems solved by technology

[0004] Most sewage plants mix domestic sewage and industrial wastewater, resulting in excessive heavy metal content in sludge, especially copper, zinc, lead, and chromium metals. How to remove heavy metals in sludge is a major difficulty in sludge treatment and disposal. At present, the sludge treatment methods in my country mainly include landfill, composting, incineration, and natural drying. The proportions of these four treatment methods are 65%, 15%, 6%, and 3%, respectively. The treatment of heavy metals in leachate is a major difficulty. Composting takes a long time and costs high, and the heavy metal content in sludge directly affects the quality of compost products. Incineration technology has strict requirements on sludge moisture content and calorific value. Residue treatment is also a technical difficulty. The existing technology only focuses on sludge reduction and resource utilization, and cannot effectively deal with heavy metals in sludge.

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