Method for disposing waterworks sludge

Abstract

The invention discloses a method for disposing waterworks sludge. The method comprises the following steps: dehydrating, drying and crushing the sludge produced when drinking water or industrial water supply waterworks perform purified water treatment by adopting aluminum salt, iron salt and aluminum-iron salt as coagulants, and adding the sludge into high-temperature molten converter steel slag in a weight ratio of 1 to 10 percent, namely using the high-temperature molten converter steel slag after tapping to dispose the waterworks sludge without hazard. Silicon or aluminum acid compounds rich in the waterworks sludge can adjust the alkalinity of the converter steel slag at the same time and partially eliminate free calcium oxide and magnesium oxide contents in the converter steel slag, so the stability of the steel slag volume becomes better, and the method is more favorable for the reutilization of the steel slag so as to realize the resource utilization of the waterworks sludge.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a disposal method for sludge generated when drinking water or industrial water plants use aluminum salts, iron salts or aluminum-iron salts as coagulants for water purification treatment. Background technique [0002] Drinking water and industrial water supply plants often use aluminum salts such as aluminum sulfate, polyaluminum chloride (PAC), iron salts such as ferric chloride, polyferric sulfate (PFS), aluminum-iron salts such as polyaluminum iron (PAFC), high-efficiency polymerization The raw water is coagulated with bis-acid aluminum iron (PAFCS) as a coagulant to remove most of the suspended matter and part of the dissolved matter in the raw water. The coagulated raw water completes solid-liquid separation in the sedimentation tank, and the drainage of the sedimentation tank After the muddy water is adjusted, concentrated, balanced, and dehydrated, it will pr...

AI Technical Summary

Problems solved by technology

Water plant sludge landfill mainly refers to the sanitary landfill of water plant sludge after dehydration. Sanitary landfill is a widely used method in the disposal of water plant sludge, but it needs to occupy land, and the cost of landfill is high. At the same time, the sewage Useful substances in the mud are not utilized

The discharge of water plant sludge into the sea mainly refers to the ocean disposal of dehydrated water plant sludge (mud cake) and the discharge of non-dehydrated water plant sludge into the sea. However, because of its impact on the marine ecological environment, the discharge of water plant sludge The sea will be increasingly restricted

[0004] The comprehensive utilization of water plant sludge mainly includes brick making and production of building materials, but it has the disadvantages of complicated manufacturing process and high cost, and it is required to be used as raw material for water plant sludge to have stable properties and meet certain requirements. In the process, a certain amount of additives needs to be added to meet the requirements; as the patent No. 200410093930.2, the Chinese patent titled "A method for preparing lightweight ceramsite from water supply plant and sewage plant sludge" discloses a method for using water plant A method for preparing lightweight ceramsite from sludge. Although this method can obtain lightweight ceramsite with better performance, its production process is more complicated. Sewage plant sludge is an additive, and the energy consumption and production cost of the method are relatively high

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