Heavy metal sludge harmless treatment system and method

A technology for harmless treatment of heavy metal sludge, applied in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc., to achieve easy microbial degradation, promote anaerobic fermentation, and promote anaerobic fermentation of sludge Effect

Inactive Publication Date: 2018-11-02
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] There are no reports on the use of ultrasonic pretreatment, calcium hydroxide and biosurfactants to promote the harmless treatment of heavy metals in sludge

Method used

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  • Heavy metal sludge harmless treatment system and method

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Effect test

Embodiment 1

[0035] Ultrasonic pretreatment of heavy metal sludge samples (pretreatment conditions: power 1.0W / ml, time 25min) was added to the conical flask of the anaerobic reactor with a volume of 3000ml, and the pH of the reactor was adjusted to 9.0. Nitrogen is used to realize anaerobic environment, the reactor is sealed, and the anaerobic fermentation is carried out for 8 days. The stirring speed of the anaerobic fermentation is 120r / min, and the temperature of the anaerobic reactor is controlled to be 40±0.5°C. Stabilizes heavy metals in sludge through alkaline treatment and the action of abundant microorganisms in the anaerobic reactor. The heavy metal removal efficiency was 36.3%.

Embodiment 2

[0037] Ultrasonic pretreatment of heavy metal sludge samples (pretreatment conditions: power of 1.2W / ml, time of 30min) was added to the conical flask of the anaerobic reactor with a volume of 3000ml, and the pH of the reactor was adjusted to 9.5. Nitrogen is used to realize anaerobic environment, the reactor is sealed, and the anaerobic fermentation is carried out for 8 days. The stirring speed of the anaerobic fermentation is 125r / min, and the temperature of the anaerobic reactor is controlled to be 38±0.5°C. Stabilizes heavy metals in sludge through alkaline treatment and the action of abundant microorganisms in the anaerobic reactor. The heavy metal removal efficiency was 49.3%.

Embodiment 3

[0039]Ultrasonic pretreatment (pretreatment conditions: power 1.2W / ml, time 35min) was added to the conical flask of the anaerobic reactor with a volume of 3000ml, and the pH of the reactor was adjusted to 10.0. Nitrogen is used to realize anaerobic environment, the reactor is sealed, and anaerobic fermentation is carried out for 8 days. The stirring speed of anaerobic fermentation is 120r / min, and the temperature of anaerobic reactor is controlled to be 35±0.5°C. Stabilizes heavy metals in sludge through alkaline treatment and the action of abundant microorganisms in the anaerobic reactor. The heavy metal removal efficiency was 64.3%.

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Abstract

The invention belongs to the technical field of environment protection difficult treatment heavy metal treatment, and relates to a method for promoting heavy metal treatment in rest sludge. The concrete method comprises the following steps of performing ultrasonic pretreatment on the rest sludge containing heavy metal; then, charging the materials into an anaerobic reaction; adding biosurfactantsand calcium hydroxide into the reactor; performing stirring so that the substances in the reactor are uniformly mixed; meanwhile, controlling the fermentation temperature. The method provided by the invention has the advantages that the treatment and immobilization of the heavy metal in the sludge can be effectively promoted; the pollution of the heavy metal on the environment can be relieved; thefoundation is laid or the land utilization after the anaerobic treatment of the rest sludge; meanwhile, the positive guidance and reference significance can be realized on how to efficiently remove other heavy metal contaminants in the rest sludge.

Description

technical field [0001] The invention mainly relates to the technical field of solid waste treatment, in particular to a method for promoting the harmless treatment of heavy metals in excess sludge. technical background [0002] With population growth and economic development, the amount of urban sewage generated in my country is increasing year by year. In order to meet people's needs for the environment, my country has increased its sewage treatment efforts. By the end of 2015, the daily urban sewage treatment capacity had increased from 125 million tons in 2010 to 182 million tons. As far as the status quo of sewage treatment in my country is concerned, most of the sewage treatment plants in operation adopt aerobic biological treatment process, which has an obvious disadvantage that it will produce a large amount of excess sludge. The remaining sludge must be disposed of reasonably, because it can pollute the soil and water, destroy the food chain, and threaten the ecolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04C02F101/20
CPCC02F11/002C02F11/004C02F11/04C02F2101/20C02F2209/02C02F2209/06C02F2305/04
Inventor 徐秋翔李小明王冬波杨麒曾光明
Owner HUNAN UNIV
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