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Composite sludge dehydrating conditioner prepared from papermaking sludge and preparation method of composite sludge hydrating conditioner

A papermaking sludge and sludge dewatering technology, which is applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/concentrated sludge treatment, etc., can solve the problems of dehydration conditioner hazards, etc., and achieve low cost, The effect of reducing specific resistance and reducing water content

Inactive Publication Date: 2015-03-25
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a compound sludge dehydration conditioner prepared with papermaking sludge as the main raw material and its preparation method in view of the hazards existing in the existing dehydration conditioner, which realizes the resource utilization of papermaking sludge , at the same time reduce the dosage of polyacrylamide, reduce secondary pollution, and have obvious environmental benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The method of using papermaking sludge to prepare composite sludge dehydration conditioner in this embodiment, the steps are as follows:

[0019] (1) Alkali dissolution: Add 100Kg of papermaking sludge into 1000Kg of water, add dropwise NaOH solution with a mass concentration of 8% under stirring, control the pH value at 11, stir for 30 minutes, filter, and use the filtrate for later use;

[0020] (2) Acid analysis: under stirring, add sulfuric acid to the filtrate obtained in step (1) to adjust the pH to 3, so that the lignin is completely precipitated, keep it in an 80°C water bath for 60 minutes, and suction filter while it is hot to obtain a filter cake;

[0021] (3) Drying: Dry the filter cake at 45°C and crush it to obtain lignin.

[0022] (4) Based on 100Kg of sludge dry basis, mix lignin, polyaluminum chloride and polyacrylamide by percentage as lignin: polyaluminum chloride: polyacrylamide = 8: 0.8: 0.02 to obtain composite sludge Dehydrating conditioner.

[...

Embodiment 2

[0025] The method of using papermaking sludge to prepare composite sludge dehydration conditioner in this embodiment, the steps are as follows:

[0026] (1) Alkali dissolution: Add 100Kg of papermaking sludge into 1200Kg of water, add dropwise NaOH solution with a mass concentration of 12% under stirring, control the pH value at 12, stir for 40min, filter, and use the filtrate for later use;

[0027] (2) Acid analysis: under stirring, add sulfuric acid to the filtrate obtained in step (1) to adjust the pH to 4, so that the lignin is completely precipitated, keep it in a water bath at 90°C for 50 minutes, and suction filter while it is hot to obtain a filter cake;

[0028] (3) Drying: Dry the filter cake at 55°C and crush it to obtain lignin;

[0029] (4) Based on 100Kg of sludge dry basis, mix lignin, polyaluminum chloride and polyacrylamide by percentage as lignin: polyaluminum chloride: polyacrylamide = 12%: 0.8%: 0.03% and mix evenly. Preparation of composite sludge condit...

Embodiment 3

[0032] The method of using papermaking sludge to prepare composite sludge dehydration conditioner in this embodiment, the steps are as follows:

[0033] (1) Alkali dissolution: Add 100Kg of papermaking sludge into 1100Kg of water, add dropwise NaOH solution with a mass concentration of 10% under stirring, control the pH value at 11, stir for 35 minutes, filter, and use the filtrate for later use;

[0034] (2) Acid analysis: under stirring, add sulfuric acid to the filtrate obtained in step (1) to adjust the pH to 4, so that the lignin is completely precipitated, keep it in a water bath at 85°C for 55 minutes, and suction filter while it is hot to obtain a filter cake;

[0035] (3) Drying: Dry the filter cake at 50°C and crush it to obtain lignin;

[0036] (4) Based on 100Kg of sludge dry basis, mix lignin, polyaluminum chloride and polyacrylamide by percentage as lignin: polyaluminum chloride: polyacrylamide = 16%: 0.8%: 0.04%, mix evenly, Preparation of composite sludge cond...

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Abstract

The invention belongs to the fields of environmental protection and resource utilization of solid waste papermaking sludge, and particularly relates to a method of preparing a sludge dehydrating conditioner by taking papermaking sludge as a main raw material and compounding the papermaking sludge with poly(aluminum chloride) and polyacrylamide. The method comprises the following steps: dissolving lignin in the papermaking sludge by using water and a sodium hydroxide liquid; acidifying the filtrate by a sulfuric acid solution, filtering and drying precipitates to obtain the lignin; and uniformly mixing the lignin with the poly(aluminum chloride) and polyacrylamide in a weight part ratio of (8-16) to (0.8-2.4) to (0.02-0.04) to obtain the composite sludge dehydrating conditioner. The composite sludge dehydrating conditioner takes the papermaking sludge as the main raw material, the whole preparation process is simple, and the raw material is solid waste, so that not only is a pollution problem of the papermaking sludge on the environment solved, but also the specific resistance of the sludge can be obviously reduced and the moisture content of the sludge can be lowered by virtue of the conditioner, and therefore, a purpose of recycling the papermaking sludge to treat waste with waste is realized.

Description

technical field [0001] The patent of the invention belongs to the field of resource utilization of solid waste papermaking sludge, and specifically relates to the preparation of a composite sludge dehydration conditioner by using the papermaking sludge produced after alkaline papermaking as the main raw material. Background technique [0002] Papermaking sludge is a major waste produced by the papermaking industry. It has complex components, large output, high moisture content, and difficult treatment. Therefore, its disposal has restricted the development of the papermaking industry for a long time, and at the same time it has brought great harm to the environment. a lot of pressure. At present, simple stacking, landfill and incineration are usually used, which will not only cause new environmental problems, but also cause waste of resources. Based on this status quo, more and more research is being done on the resource utilization of papermaking sludge in China. Most of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/00C08H7/00
CPCC02F11/00C02F11/14C02F2103/28C07G1/00C08H6/00
Inventor 蒋玲李占才黄改玲赵继红徐粉李淑勉
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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