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Sludge dewatering conditioner and sludge dewatering method

A sludge dehydration and conditioning agent technology, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of simultaneous removal and single function

Active Publication Date: 2022-07-15
北京环球中科水务科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above patents can effectively improve the defects existing in the use of a single flocculant, reduce the water content in the sludge, and improve the filtration characteristics of the sludge, they only realize the dehydration of the sludge and cannot treat other harmful substances in the sludge. Realize synchronous removal to improve the efficiency of subsequent sludge treatment, the role is relatively simple

Method used

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  • Sludge dewatering conditioner and sludge dewatering method
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  • Sludge dewatering conditioner and sludge dewatering method

Examples

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Embodiment 1

[0023] This embodiment provides a sludge dewatering conditioner, comprising 4.5g LaCl 3 ·7H 2 O and 1.5 g of cationic polyacrylamide.

[0024] The present embodiment also provides a method for dewatering sludge, using the above conditioning agent, comprising the following steps:

[0025] (1) Dissolve lanthanum chloride heptahydrate into an aqueous solution with a concentration of 100 g / L;

[0026] (2) 45mL of step (1) solution was added to 5kg of sludge with a moisture content of 97% within 3min at a speed of 200rpm (that is, 30 mg / g TSS was added to the sludge), and then reacted for 10min;

[0027] (3) Continue to add 1.5g of cationic polyacrylamide (that is, add 10 mg / g TSS to the sludge) at a speed of 200 rpm, and stir for 2 min; then reduce the speed to 40 rpm and continue to stir for 12 min;

[0028] (4) Press filter the above sludge under the pressure of 0.6Mpa for 50min to obtain a dewatered sludge filter cake.

Embodiment 2

[0030] This embodiment provides a sludge dewatering conditioner, comprising 7.5 g La (NO 3 ) 3 ·6H 2 O and 0.75 g chitosan.

[0031] The present embodiment also provides a method for dewatering sludge, using the above conditioning agent, comprising the following steps:

[0032] (1) Dissolve lanthanum nitrate hexahydrate into an aqueous solution with a concentration of 120 g / L;

[0033] (2) 62.5mL of step (1) solution was added to 5kg of sludge with a moisture content of 97% within 5min at a speed of 100rpm (that is, 50 mg / g TSS was added to the sludge), and then reacted for 5min;

[0034] (3) Continue to add 0.75g of chitosan (that is, add 5 mg / g TSS to the sludge) at a speed of 100rpm, and stir for 3min; then reduce the speed to 20rpm, and continue to stir for 15min;

[0035] (4) Press filter the above sludge under the pressure of 0.5Mpa for 60min to obtain a dewatered sludge filter cake.

Embodiment 3

[0037] This embodiment provides a sludge dewatering conditioner, comprising 1.5g LaCl 3 ·7H 2 O and 2.25 g cationic starch.

[0038] The present embodiment also provides a method for dewatering sludge, using the above conditioning agent, comprising the following steps:

[0039] (1) Dissolve lanthanum chloride heptahydrate into an aqueous solution with a concentration of 80 g / L;

[0040] (2) 19mL of step (1) solution was added to 5kg of sludge with a moisture content of 97% within 5min at a speed of 300rpm (that is, 10 mg / g TSS was added to the sludge), and then reacted for 20min;

[0041] (3) Continue to add 2.25g of cationic starch (that is, add 15 mg / g TSS to the sludge) at a speed of 300 rpm, and stir for 1.5 min; then reduce the speed to 60 rpm and continue to stir for 10 min;

[0042] (4) Press filter the above sludge under the pressure of 0.8Mpa for 40min to obtain the dehydrated sludge filter cake.

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Abstract

The invention belongs to the technical field of sludge treatment, and particularly relates to a sludge dewatering conditioner and a sludge dewatering method. Wherein the conditioner comprises lanthanide inorganic salt and an organic flocculant in a mass ratio of (2-10): (1-3), and the conditioner can effectively destroy a sludge floc structure, release intercellular interstitial water and intracellular bound water, improve sludge dewatering performance and realize sludge reduction; the conditioner disclosed by the invention can also remove phosphate in the sludge, maintain the pH value of a sludge system and simplify the subsequent process flow, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a sludge dewatering conditioner and a sludge dewatering method. Background technique [0002] Sludge is a sedimentary substance produced in the process of sewage treatment by sewage treatment plants. It has fine particles, high water content, complex components, and is parasitic with various bacteria, viruses and parasites. It is also rich in heavy metals and polycyclic aromatic hydrocarbons and other toxic substances. If not handled properly, it will cause secondary pollution to the environment. The treatment of sludge in my country follows the principle of "reduction, stabilization, harmlessness and recycling". As an important prerequisite for sludge disposal, dewatering can greatly reduce the volume of sludge and reduce the cost of sludge transportation. It is an important means of the principle of "reduction". In the process of sludge reduction treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/148C02F11/00C02F101/10
CPCC02F11/148C02F11/00C02F2101/105
Inventor 李丹丹杨鹏徐绪筝虞红波楼鑫
Owner 北京环球中科水务科技股份有限公司
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