A quenching and tempering treatment method for controlling heavy metal pollution in printing and dyeing sludge co-firing project

Abstract

The invention discloses a quenching and tempering treatment method for controlling heavy metal pollution in a printing and dyeing sludge mixed burning project. In terms of mass fraction, 1-3% of alkali plant waste residue, 1-3% of water purification sludge, 5-15% of printing and dyeing sludge and 81-92% of coal, the alkali plant waste residue, water purification sludge, printing and dyeing sludge and The coal is mixed evenly according to the above content, and then put into the boiler as fuel for incineration. The present invention utilizes the characteristics of high calcium content in alkali plant waste residue and high aluminum content in water purification sludge, as well as its adsorption and capture characteristics for heavy metals in the incineration process, and uses the two types of waste as the incineration process of printing and dyeing sludge mixed with coal. The conditioning agent can significantly increase the residual rate of heavy metals on the slag during the incineration process, thereby reducing the secondary pollution of heavy metals in the tail gas and fly ash during the incineration process. The method of the invention simultaneously realizes the reuse of two kinds of wastes.

Description

Technical field: [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a quenching and tempering treatment method for controlling heavy metal pollution in a printing and dyeing sludge co-firing project. Background technique: [0002] Printing and dyeing wastewater treatment produces a large amount of sludge with complex components, usually containing heavy metal elements such as copper, zinc, nickel, chromium, arsenic, etc., which has great environmental hazards. The disposal of printing and dyeing sludge is a difficult problem faced by the printing and dyeing industry at present. Sludge disposal methods are mainly landfill and incineration. With people's awareness of its environmental hazards, landfill treatment is gradually restricted or even banned due to land restrictions and the difficulty of secondary pollution risks, and incineration treatment is encouraged in various places. Incineration treatment can achieve ...

AI Technical Summary

Problems solved by technology

Adding additives to sludge can change the migration and distribution of heavy metals during incineration through adsorption, coagulation, and chemical reaction mechanisms, thereby increasing the fixation rate of heavy metal residues. This method has been studied in recent years, such as adding lime and kaolin to urban sewage plant sewage. Mud can improve the heavy metal residual rate in the incineration process, but there are still disadvantages such as high cost and limited increase in the heavy metal residual rate, so this method is still under continuous research and improvement

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