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Dehydration method for sludge from sewage treatment

A technology for sewage treatment and sludge, which is applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/thickened sludge treatment, etc. It can solve the problems of complex equipment, high cost, and low dehydration rate. Achieve the effects of reducing heat energy consumption, simple dehydration method, and reducing treatment costs

Inactive Publication Date: 2017-02-15
MOBAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings in the prior art that the dehydration of sewage sludge is difficult, the dehydration rate is not high, the use of equipment is complicated, the cost is high, and the sludge after extrusion dehydration is not easy to handle, and a sewage treatment method is proposed. Sludge dehydration method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of dewatering method of sewage treatment sludge that the present invention proposes comprises the following steps:

[0021] S1. Put undehydrated sludge into high-speed mixing equipment, add sodium hydroxide with a concentration of 25% to adjust the pH value of the sludge to 11, and heat to 80°C at a speed of 700r / min while heating. Stir at high speed for 22 minutes, then keep warm for 2.8 hours;

[0022] S2. Utilize the 400-mesh filter to filter the sewage sludge after standing in step S1, add the filtered sludge to the centrifuge equipment, centrifuge for 25min, and perform dehydration treatment to obtain dewatered sewage with a moisture content of 55%. Mud, the sewage obtained by suction filtration and separation is put into the sewage treatment process;

[0023] S3. Put the sludge obtained in step S2 into a roller dryer, and carry out hot air circulation drying at an environment of 110° C., and control the drying time to obtain sludge with a desired moisture ...

Embodiment 2

[0025] A kind of dewatering method of sewage treatment sludge that the present invention proposes comprises the following steps:

[0026] S1. Put the undehydrated sludge into the high-speed stirring equipment, add sulfuric acid with a concentration of 60% to adjust the pH value of the sludge to 3.8, and heat it to 60°C, and perform high-speed stirring at a speed of 900r / min while heating 18min, then keep warm for 2.2h;

[0027] S2. Utilize the 250-mesh filter to filter the sewage sludge after standing in step S1, add the filtered sludge to the centrifuge equipment, centrifuge for 22min, and perform dehydration treatment to obtain dewatered sewage with a moisture content of 60%. Mud, the sewage obtained by suction filtration and separation is put into the sewage treatment process;

[0028] S3. Add the sludge obtained in step S2 into the evaporator, heat to 80°C, stir at a speed of 300r / min while heating, and control the heating and stirring time to obtain sludge with the desir...

Embodiment 3

[0030] A kind of dewatering method of sewage treatment sludge that the present invention proposes comprises the following steps:

[0031] S1. Put the undehydrated sludge into the high-speed mixing equipment, add 22% sodium hydroxide to adjust the pH value of the sludge to 9.8, and heat it to 90°C at a speed of 600r / min while heating Stir at high speed for 25 minutes, then keep warm for 3 hours;

[0032] S2. Utilize the 800-mesh filter to filter the sewage sludge after standing in step S1, add the filtered sludge to the centrifuge equipment, centrifuge for 30min, and perform dehydration treatment to obtain dewatered sewage with a moisture content of 48%. Mud, the sewage obtained by suction filtration and separation is put into the sewage treatment process;

[0033] S3. Put the sludge obtained in step S2 into a roller dryer, and perform hot air circulation drying at 120° C., and control the drying time to obtain sludge with a desired moisture content.

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Abstract

The invention discloses a dehydration method for sludge from sewage treatment. The dehydration method comprises the following steps: S1, the sludge without dehydration treatment is put into high-speed stirring equipment, a PH regulator is added to regulate the PH value of the sludge, high-speed stirring is performed while heating, thermal insulation is performed, and the sludge is left to stand; S2, the sewage sludge after standing is filtered by a filter, preliminary dehydration treatment is performed, and dehydrated sludge is obtained; S3, the dehydrated sludge is added to a roller dryer for hot air circulating drying, the drying time is controlled, and the sludge with the required moisture content is obtained. The dehydration method for sludge from sewage treatment is simple in process, utilization of large equipment and devices and consumption of heat energy is reduced, the treatment cost is reduced, the moisture rate of the finally obtained sludge is low and controllable, the method can be widely applied to dehydration treatment of industrial and domestic sewage sludge, and the treated sludge can be used for preparing fertilizer and building materials.

Description

technical field [0001] The invention relates to the technical field of sewage treatment and environmental protection, in particular to a method for dehydrating sewage treatment sludge. Background technique [0002] Sludge dehydration refers to a sludge treatment method that removes water from fluidized primary, concentrated or digested sludge and converts it into semi-solid or solid sludge. The sludge produced by sewage treatment has a high water content. Due to the combination of water and sludge particles, mechanical removal has certain limitations. It has an important influence on the final solid content. Generally speaking, the solid content of 20% to 30% can be obtained by mechanical dehydration, and the formed sludge is also called mud cake. The water content of the mud cake is still high and has a fluid nature, and its disposal is still difficult and costly, so further reduction is necessary. At this time, in addition to natural air drying, only through the input o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/14
CPCC02F11/12C02F11/121C02F11/127C02F11/14
Inventor 马从勇
Owner MOBAO CO LTD
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