Processing method of low-cost heavy metal-containing sludge

Abstract

The invention discloses a processing method of low-cost heavy metal-containing sludge. The method comprises the following steps: adding acid to the sludge with high water content to adjust the pH value to 3-5, adding into an MBR membrane tank, putting the MBR membrane tank processed effluent in a heavy metal adsorbing device, and putting into an MBR terminal tank and draining to a sludge concentrating tank; automatically flowing the residual sludge with high water content filtered by the MBR membrane tank to the sludge concentrating tank, dehydrating by a sludge dehydrator, putting the dehydrated wet sludge with the water content of 80% into a solar composite membrane low-temperature evaporating device to dry and evaporate, reusing the evaporated distilling water or draining after reaching the standard and using the dried highly dried sludge for the agricultural bio-organic fertilizer. The method is low in running cost and high in processing efficiency; the device in the treatment process is convenient to operate; the processed sludge containing heavy metal can reach the national related technical standard.

Description

technical field [0001] The invention relates to the technical field of harmless and resourceful treatment of wet sludge in biochemical sedimentation tanks of sewage plants or polluted soil dry sludge to be repaired, in particular to a new method for treating sludge containing heavy metals. Background technique [0002] With the acceleration of urbanization, the discharge of domestic wastewater and industrial sewage is increasing, and the output of sludge as a by-product of sewage treatment is also increasing accordingly. Sludge has complex components, extremely high water content and is not easy to dehydrate. It contains many refractory organic pollutants, harmful heavy metals and pathogenic microorganisms, which seriously threaten the survival, health and development of human beings. Practice has proved that the resource utilization of sludge is an inevitable way out for sludge treatment. However, more than half of the heavy metals in the sewage treatment process will be tr...

AI Technical Summary

Problems solved by technology

The main problems of this method for treating heavy metals in sludge are as follows: one is that the mixing of sludge and gel is not easy to be uniform; The heavy metals in the sludge with a certain distance from the gel cannot be removed, and the sludge will gradually block the adsorption pores on the surface of the gel during long-term operation, thereby reducing the adsorption effect; Some small gel particles are mixed in the sludge