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Method for treating sludge

A treatment method and technology for sludge, applied in sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as unfavorable large-scale production, waste of resources, and lack of comprehensive utilization of beneficial components. Achieve the effect of protecting the natural ecological environment, convenient operation, and improving the rate of chemical reaction

Active Publication Date: 2016-12-07
四川高绿平环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process only treats the metal ions that pollute the environment in the wastewater, improves the dehydration of the sludge, and improves the treatment efficiency in order to meet the environmental protection discharge standards. However, the beneficial components in the wastewater and sludge are not comprehensively utilized. The production process A large amount of waste liquid is produced in the process, a waste of resources, which is not conducive to large-scale industrial production

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0045] Embodiment 1: a kind of processing method of sludge, it comprises the following steps:

[0046] S1. Slurry preparation: Add the sludge to the slurry mixing tank, add water to stir and disperse to form a slurry, the slurry is separated by sedimentation to obtain sludge and sedimentation liquid, and the sedimentation liquid is returned to the slurry mixing tank for recycling. The separation is carried out by a decanter, and the rotation speed of the decanter is 2800rad / min.

[0047] S2. Neutralization: Slowly add dilute phosphoric acid and sludge residue with a moisture content of 80% into a neutralization tank for neutralization reaction to obtain a solid-liquid mixture, and the mass ratio of the dilute phosphoric acid and sludge residue is 1:1; wherein , the time of the neutralization reaction is to continue to react for 0.5h after feeding at room temperature for 1h;

[0048] S3. Crystal growth: send the solid-liquid mixture obtained in step S2 into the crystal growth ...

Embodiment 2

[0054] Embodiment 2: a kind of processing method of sludge, it comprises the following steps:

[0055] S1. Slurry preparation: Add the sludge to the slurry mixing tank, add water to stir and disperse to form a slurry, the slurry is separated by sedimentation to obtain sludge and sedimentation liquid, and the sedimentation liquid is returned to the slurry mixing tank for recycling. The separation is carried out by a decanter, and the rotation speed of the decanter is 3200rad / min.

[0056] S2. Neutralization: Slowly add dilute phosphoric acid and sludge residue with a water content of 95% into a neutralization tank for neutralization reaction to obtain a solid-liquid mixture, the mass ratio of the dilute phosphoric acid and sludge residue being 1:3; wherein , the time of the neutralization reaction is to continue to react for 1.5h after feeding at room temperature for 3h;

[0057] S3. Crystal growth: send the solid-liquid mixture obtained in step S2 into the crystal growth tank...

Embodiment 3

[0063] Embodiment 3: a kind of processing method of sludge, it may further comprise the steps:

[0064] S1. Slurry preparation: Add the sludge to the slurry mixing tank, add water to stir and disperse to form a slurry, the slurry is separated by sedimentation to obtain sludge and sedimentation liquid, and the sedimentation liquid is returned to the slurry mixing tank for recycling. The separation is carried out by a decanter, and the rotation speed of the decanter is 3200rad / min.

[0065] S2. Neutralization: Slowly add dilute phosphoric acid and sludge residue with a moisture content of 90% into a neutralization tank for neutralization reaction to obtain a solid-liquid mixture, and the mass ratio of the dilute phosphoric acid and sludge residue is 1:2; wherein , the time of the neutralization reaction is to continue to react for 1h after feeding at room temperature for 2h;

[0066] S3. Crystal growth: send the solid-liquid mixture obtained in step S2 into the crystal growth t...

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Abstract

The invention discloses a method for treating sludge. The method comprises the following steps: preparing pulp; neutralizing; growing the grain; performing first-level flocculation settling; performing filter pressing; deeply dephosphorizing; performing second-level flocculation settling; mixing products. According to the method for treating sludge provided by the invention, the sludge generated in the production process of metal surface waste treating and heat-processing enterprise can be treated for generating fertilizer-level phosphate; the resources are saved while the wastes are turned into wealth; the natural ecological environment is protected; the benefit is increased; the pulp pretreatment is added according to the method, so that the chemical reaction rate between sludge and dilute acid ingredients is increased; an alkali grain-growing process is newly added, the standing time is longer, the products including phosphate can be increased and the settling effect can be increased; few flocculants are respectively added for the first-level flocculation settling and the second-level flocculation settling, so that the settling effect is increased, the alkali is added in stages and the settlement of metal hydroxide is boosted; the method has the advantages of simple technique, convenient operation, low cost and suitability for industrial production.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a sludge treatment method. Background technique [0002] Sludge is the product of sewage treatment, which is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloidal sludge, etc. The main characteristics of sludge are high water content (up to 99%), high content of organic matter, easy to rot and smell, and the particles are finer, the specific gravity is smaller, and it is in a colloidal liquid state. It is a thick substance between liquid and solid, which can be transported by pump, but it is difficult to separate solid and liquid by sedimentation. As the name implies, surface treatment waste (sludge) is mainly derived from the sludge generated in the production process of metal surface treatment and thermal processing enterprises. The main substances of sludge are calcium phosphate and cal...

Claims

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Application Information

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IPC IPC(8): C02F11/00C05B7/00C05B3/00
CPCC02F11/00C05B3/00C05B7/00
Inventor 蒲江
Owner 四川高绿平环境科技有限公司
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