Treatment method of heavy metals in sludge

Abstract

The invention discloses a treatment method of heavy metals in sludge, relates to the technical field of environmental protection and chemical engineering, and in particular relates to the technical field of treatment of sludge heavy metal through filter pressing of urban domestic sewage. The treatment method of the heavy metals in sludge is characterized by comprising the following steps: hydrolyzing proteins in the sludge through a function of a modifying agent; deaminizing amino acid and fixing amino; performing reaction on ammonium chloride generated by fixation and the added calcium hydroxide and glucose powder step by step to reduce sludge heavy metal ion valence or to be directly reduced into elementary substances; reducing heavy metal ions which are not completely reduced under a reduction function of surplus fixed carbon after the heating of the sludge in a subsequent distillation process. The invention discloses a sludge innocent treatment method; resources contained in the sludge are fully utilized, and a practical and feasible new method is provided for sludge treatment.

Description

technical field [0001] The invention relates to the technical field of environmental protection and chemical industry, in particular to the technical field of heavy metal treatment in press filter sludge after sewage treatment. Background technique [0002] In recent years, with the rapid growth of my country's sewage treatment capacity and treatment rate, a large amount of excess sludge has been produced. At present, only a small part of the sludge from urban sewage treatment plants in the country is used for sanitary landfill, land utilization, incineration and building material utilization, etc., and most of them have not undergone standardized treatment and disposal. The heavy metals contained in excess sludge are non-degradable. If they are transported out, simply landfilled or piled up without effective treatment and disposal, they will easily cause persistent pollution to groundwater and soil, directly threatening environmental safety and public health. [0003] Heav...

AI Technical Summary

Problems solved by technology

Physical methods are mainly based on fixed carbon adsorption, electrodynamic repair and supercritical fluid extraction technologies, but cannot be popularized due to immature technologies or unsatisfactory effects; chemical removal methods require high cost due to the addition of a large amount of acid and alkali; biological The removal efficiency of heavy metals in sludge depends on the activity of microorganisms and the type and form of heavy metals. In actual production and application, the removal process is strictly required, and the types of microorganisms need to be screened and cultivated in large quantities; the treatment range of phytoremediation is relatively limited. Narrow and plant growth requires a certain cycle, which cannot meet the growing demand for municipal sludge treatment

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