Salinization sludge treatment method

Abstract

The invention belongs to the technical field of salinization sludge treatment, and discloses a salinization sludge treatment method. The method comprises the following steps: feeding salinized sludgeinto a crusher for treatment to obtain crushed sludge, so a contact area of subsequent sludge particles and water is increased; then stirring and mixing the crushed sludge and water, and recovering and removing salt in the sludge through an electrochemical leaching effect so as to obtain desalinized sludge, a leaching filtrate and solid calcium hydroxide; and dehydrating the sludge under the action of the dead weight of a filter bag, purifying and recovering salt in the leaching filtrate and a filtrate through an electrolytic cell, and changing the desalting filtrate into circulating water toleach the salinized sludge again. The obtained solid calcium hydroxide is collected, transported outwards and reused; the salinized sludge is used for landscaping, so the landscaping value of the sludge is effectively excavated; and zero emission of tail water is achieved.

Description

technical field [0001] The invention belongs to the technical field of salinization sludge treatment, and in particular relates to a treatment method for salinization sludge. Background technique [0002] At present, in the existing large-scale sewage treatment plants, the excess sludge obtained contains refractory organic matter. If no chemicals are added, the dehydration of the excess sludge with a filter press is not effective. Therefore, many large-scale sewage treatment plants A large amount of quicklime will be added in the process of pressure filtration to achieve disinfection and sterilization and enhance the effect of pressure filtration. [0003] The traditional treatment method for this kind of salinized sludge is the brick-making method of dried sludge. Dried sludge brick making is to dry the sludge (dry or dry it outdoors naturally), after grinding, mix it with other raw materials (such as clay), pressurize it, and bake it to make sludge bricks. However, in th...

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Problems solved by technology

[0004] Through the above analysis, the problems and defects of the prior art are: (1) in the prior art, roasting will produce harmful gas, pollute the environment twice, and are not friendly to the environment

[0005] (2) In the prior art, the pressure molding and roasting processes need to consume more energy, wasting energy resources

[0006] (3) In the existing technology, the compressive strength of bricks will decrease with the increase of sludge doping, and whether the compressive strength is sufficient as a building material always needs to be considered

[0007] (4) In the existing technology, the heavy metals in the sludge have not been effectively extracted, recycled, and utilized. As building materials, they may cause potential harm to the human body, and the recycling value of heavy metals has not been tapped

[0008] (5) In the prior art, the garden utilization value of sludge as organic matter has not been excavated

[0014] The significance of solving the above problems and defects is: (1) Harmful gases will pollute the air again, causing environmental pollution, which will eventually cause harm to the human body

[0015] (2) Using more energy to treat sludge will cause waste of energy

[0016] (3) Excessive sludge doping will always affect the compressive strength of sludge bricks, so that sludge bricks cannot be used as building materials

[0017] (4) Heavy metals remaining in sludge may be potentially harmful to the environment

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