Method for eliminating copper and zinc pollution in municipal sludge utilizing barnyard grass

Abstract

The invention belongs to the field of environmental protection, and provides a method for eliminating copper and zinc pollution in municipal sludge utilizing barnyard grass. The method comprises: a barnyard grass selecting process, wherein barnyard grass is selected from seedlings well growing; a sludge treatment process, wherein sludge is dewatered, aged, aired and screened by a screen of 1-5mm for later use; a process of planting barnyard grass in the sludge, wherein watering is carried out at a fixed period to maintain the water content in the sludge at 8-20%; and a process of harvesting and removing the whole barnyard grass after barnyard grass is mature. According to the invention, the barnyard grass, which has the characteristic of enriching heavy metals copper and zinc, is utilized to absorb and accumulate heavy metals copper and zinc, the whole barnyard grass is harvested and removed after the barnyard grass is mature, and the processes are repeated; and by the manner, a great amount of copper and zinc can be removed from the sludge, so that the purpose of repairing the copper and zinc pollution in the sludge is achieved.

Description

technical field [0001] The invention relates to biotechnology, in particular to a technology for treating environmental pollutants by using biological methods, in particular to a method for repairing heavy metal copper and zinc in urban sludge by using barnyard millet. Background technique [0002] With the acceleration of urbanization and the improvement of living standards, the rate of urban sewage treatment has increased rapidly, and the output of sludge has also increased sharply. According to the statistics of the Ministry of Environmental Protection of my country in 2010, about 30 million tons of sludge with a moisture content of 80% are produced in my country every year. A large amount of sludge that has not been stabilized has no safe way out, and the phenomenon of random discarding and dumping is common. The resulting secondary pollution can no longer be ignored, and some areas have also caused environmental pollution incidents due to improper disposal of sludge. T...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for eliminating copper and zinc pollution in urban sludge by using barnyard millet. Technical problems with low volume and slow growth

Images