Deep dehydrating agent for urban sewage plant sludge and industrial sewage plant sludge

Abstract

The invention discloses a deep dehydrating agent for urban sewage plant sludge and industrial sewage plant sludge, wherein the deep dehydrating agent is prepared from the following raw materials: 15 to 40 parts of aluminium salt, 10 to 30 parts of calcium sulfate, 1 to 5 parts of sodium carbonate, 1 to 5 parts of silicate, 30 to 60 parts of magnesium salt, 1 to 5 parts of calcium chloride, 1 to 5parts of clay mineral, 5 to 10 parts of carbonate, 1 to 5 parts of basic oxide and 5 to 15 parts of ferrous sulfate; adding a chemical to enable electrostatic attraction, Van der Waals' force attraction, ion exchange and chemical precipitation to be simultaneously carried out, heavy metal pollutants such as cadmium, chromium, arsenic and mercury in the sludge can be cured and passivated in the sludge, the bio-availability and mobility in the sludge can be reduced, no secondary pollution exists, molecular chain (surface bound water) water discharging can be cut off, so as to improve the physicochemical property of dewatered sludge, thereby enabling the dewatered sludge to have good water permeability and dehydration property, so that the stable of a landfill can be facilitated, and the indexes of the sludge are improved through sterilizing and inhibiting corrosion.

Description

technical field [0001] The invention relates to the technical field of dehydrating agents, in particular to a deep dehydrating agent for urban sewage plant sludge and industrial sewage plant sludge. Background technique [0002] At present, urban sewage treatment plants generally use polymer flocculants (such as PAM) for conditioning, mainly through various forms of action such as electrostatic adsorption, electrical neutralization and destabilization, bridging, and net capture to aggregate fine and loose sludge particles into dense aggregates. Large particles, then settle down under the action of gravity, and then dehydrate through a high-speed centrifuge or a belt filter press, only a mud cake with a moisture content of about 80% can be obtained, which is difficult to meet the mixed landfill requirements for sludge disposal in urban sewage treatment plants. The index requirements for mixed landfill (sludge moisture content ≤ 60%) in the "Use of Mud" (GB / T23485-2009) standa...

AI Technical Summary

Problems solved by technology

[0002] At present, urban sewage treatment plants generally use polymer flocculants (such as PAM) for conditioning, mainly through various forms of action such as electrostatic adsorption, electrical neutralization and destabilization, bridging, and net capture to aggregate fine and loose sludge particles into dense aggregates. Large particles, then settle down under the action of gravity, and then dehydrate through a high-speed centrifuge or a belt filter press, only a mud cake with a moisture content of about 80% can be obtained, which is difficult to meet the mixed landfill requirements for sludge disposal in urban sewage treatment plants. The index requirements for mixed landfill (sludge moisture content ≤ 60%) in the "Use of Mud" (GB / T23485-2009) standard, therefore, we propose a kind of urban sewage plant sludge and industrial sewage plant sludge depth Dehydrating agent is used to solve the above problems