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Dehydration and concentration method for industrial sludge

A technology of industrial sludge and sludge, applied in the direction of water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problem of short service life of filter cloth, long drying time of sludge cake, and treatment cycle time Long-term problems, to achieve the effect of prolonged filtration time

Active Publication Date: 2019-07-09
HEBEI NINGFANG GRP
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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 problems of long treatment cycle time, short service life of filter cloth and long natural drying time of sludge cake in the existing sludge treatment method

Method used

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  • Dehydration and concentration method for industrial sludge
  • Dehydration and concentration method for industrial sludge
  • Dehydration and concentration method for industrial sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A method for dewatering and concentrating industrial sludge, comprising the following steps:

[0025] A. Inject sludge and dehydrating agent to 50m respectively 3 In the volume of the first mixing tank, control the addition of dehydrating agent to 100L / 40m 3 Sludge, pH value 6, mixing temperature 25°C (in winter, steam aeration tube can be used to heat to ensure temperature), mixing time 25min;

[0026] B. After mixing in the first mixing tank of step A, mix the mixed product with 0.45m 3 / min flow rate from inflow 30m 3 The volume of the second mixing tank, add lime, the amount of lime added is 8kg / m 3 Sludge, pH8 is controlled, the mixing time is 12min, the mixing temperature is room temperature, and the bottom of the second mixing tank is connected with an aeration pipeline;

[0027] C. After being treated in the second mixing tank of step B, the mixed product is mixed at 0.45m 3 / min flow rate from inflow 10m 3 volume of the third mixing tank, add anionic poly...

Embodiment 2

[0030] A method for dewatering and concentrating industrial sludge, comprising the following steps:

[0031] A. Inject sludge and dehydrating agent to 50m respectively 3 In the volume of the first mixing tank, control the addition of dehydrating agent to 100L / 40m 3 Sludge, pH value 6, mixing temperature 25°C, mixing time 20min;

[0032] B. After mixing in the first mixing tank of step A, mix the mixed product with 0.35m 3 / min flow rate from inflow 30m 3 volume of the second mixing tank, add waste residue for power plant desulfurization instead, the moisture content of the waste residue is 50%, and the addition amount is 20kg / m 3 Sludge, (the addition of waste residue ensures that the addition of lime reaches 9kg / m 3 The amount of sludge and waste residue added is adjusted by the total amount of calcium oxide and calcium carbonate. If the content is high, the amount added will be less; Control the pH to 8.5, the mixing time is 15min, the mixing temperature is room tempera...

Embodiment 3

[0036] A method for dewatering and concentrating industrial sludge, comprising the following steps:

[0037] A. Inject sludge and dehydrating agent to 50m respectively 3 In the volume of the first mixing tank, control the addition of dehydrating agent to 100L / 40m 3 Sludge, pH value 5.5, mixing temperature 23°C, mixing time 23min;

[0038] B. After mixing in the first mixing tank of step A, mix the mixed product with 0.4m 3 / min flow rate from inflow 30m 3 The volume of the second mixing tank, add lime, the amount of lime added is 10kg / m 3 Sludge, control pH8.6, mixing time is 15min, mixing temperature is room temperature, and the tank body bottom of described second mixing tank is connected with aeration pipeline;

[0039] C. After being treated in the second mixing tank of step B, the mixed product is mixed in a 0.4m 3 / min flow rate from inflow 13m 3 volume of the third mixing tank, add polyacrylamide with a mass concentration of 1‰, the addition amount is 1‰, the mixi...

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Abstract

The invention provides a dehydration and concentration method for industrial sludge and belongs to the technical field of sludge treatment. According to the dehydration and concentration method, sludge is added into a dehydrating agent and then is treated; treatment of a first mixing tank, treatment of a second mixing tank, treatment of a third mixing tank and filter pressing treatment are carriedout in sequence, wherein the volume ratio of the first mixing tank to the second mixing tank to the third mixing tank is 1 to 0.6 to (0.2 to 0.3); the dehydration and concentration method comprises the following steps: A, pouring the sludge and the dehydrating agent into the first mixing tank respectively and treating; B, after mixing through the first mixing tank in step A, enabling a mixed product to automatically flow into the second mixing tank and adding lime and treating; C, after treating through the second mixing tank in step B, enabling a mixed product to automatically flow into thethird mixing tank; adding polyacrylamide and treating; D, after treating through the third mixing tank in step C, pumping a mixed product into a diaphragm type filter press and treating to obtain a sludge cake. By adopting the method provided by the invention, the service life of filtering cloth of the filter press can be prolonged and the working period can be shortened to 1.5 to 2 hours; and thesludge cake can be completely dried after being naturally dried for 2 to 3 days.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and relates to sludge dehydration and concentration treatment, in particular to a method for dehydration and concentration of industrial sludge. With this treatment method, the filter cloth of the filter press can be replaced once a month, and the working cycle of the whole system is shortened to 1.5-2 hours (that is, the working cycle of the process from the first mixing tank to the filter cake is shortened to 1.5-2 hours. ), the efficiency is significantly improved, and the sludge cake can be completely dried after 2-3 days of natural drying. Background technique [0002] Sludge treatment is the process of sludge stabilization, reduction and harmlessness. In the existing industrial sludge treatment, it is to add "cationic amide" to absorb the liquid moisture in it so as to dry the sludge. The strong water absorption of cationic amides, but the subsequent separation of sludge from cati...

Claims

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Application Information

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IPC IPC(8): C02F11/122C02F11/148
CPCC02F11/122C02F11/14
Inventor 曹军平刘瑞宁孙红娟郭秀娟张立云
Owner HEBEI NINGFANG GRP
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