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Modified slag/chitosan composite capable of reducing water content of domestic sludge and preparation method thereof

A technology of domestic sludge and chitosan, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of polluting the atmosphere, endangering human health, etc. Improved dehydration performance and enhanced adsorption

Inactive Publication Date: 2019-11-22
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to open-air stacking, not only fine particles of slag enter the air to pollute the atmosphere, but also endanger human health

Method used

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  • Modified slag/chitosan composite capable of reducing water content of domestic sludge and preparation method thereof
  • Modified slag/chitosan composite capable of reducing water content of domestic sludge and preparation method thereof
  • Modified slag/chitosan composite capable of reducing water content of domestic sludge and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation of modified slag / chitosan composite, the method is as follows:

[0022] (1) Modification of slag

[0023] 1) Crush the slag, sieve it through a 200-mesh sieve, and take the sieve to obtain slag powder.

[0024] 2) Soak a certain amount of slag powder in 4mol / %L sulfuric acid according to the ratio of material to liquid: 1g:1mL, stir and soak for 2h under the condition of stirring speed of 30r / min, filter, and put the obtained solid into the temperature of 200°C Dry in an oven for 20 minutes to obtain modified slag.

[0025] (2) Compound preparation

[0026] 1) Put the chitosan into an oven with a temperature of 200° C., and dry it for 15 minutes.

[0027] 2) According to the mass ratio of modified slag: chitosan=200:1, take the modified slag and chitosan, and stir for 90min under the condition of stirring speed of 100r / min to obtain the modified slag / chitosan composite.

Embodiment 2

[0028] Application of Example 2 Modified Slag / Chitosan Compound in Sludge Dewatering

[0029] (1) Effect of mass ratio of modified slag to chitosan on sludge specific resistance

[0030] The domestic sludge selected in this experiment comes from a sewage treatment plant, and its water content is as high as 92%.

[0031] The preparation of modified slag / chitosan compound: method is the same as embodiment 1, just changes modified slag: the mass ratio of chitosan is respectively 100:1, 200:1, 300:1, 400:1, 500:1 , prepared into five different mass ratios of modified slag / chitosan composites.

[0032] Sludge dehydration method: Take 100mL of domestic sludge and pour it into a 250mL beaker, then take 8g of the above-mentioned modified slag / chitosan compound in different proportions and add them to the beaker respectively, and stir at 30r / min After uniformity, pour it into the Buchner funnel, turn on the vacuum pump to carry out the suction filtration experiment, and calculate the...

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Abstract

The invention relates to a modified slag / chitosan composite for reducing the water content of domestic sludge and a preparation method thereof, and belongs to the technical field of sewage treatment.The method comprises the following steps: crushing furnace slag, screening the slag with a 200-mesh sieve, taking the undersize product, soaking the furnace slag powder in sulfuric acid for 2-3 hours,filtering the mixture, and drying to obtain modified furnace slag; mixing the modified furnace slag with chitosan, and stirring the mixture to obtain the modified furnace slag / chitosan composite. Themodified slag / chitosan composite contains a large amount of Ca<2+> and Mg<2+> (derived from slag). Ca <2+> plays a bridging role between ECP and ECP and between ECP and bacteria, stable existence offlocs can be ensured, so that the dehydration performance of the sludge is improved, in addition, the slag solid waste is fully utilized by the modified slag / chitosan composite, the harm of the slag solid waste to the environment is reduced, and meanwhile, the sludge dehydration cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of sludge dehydration treatment, and in particular relates to the preparation and application of a modified slag / chitosan compound for reducing the water content of domestic sludge. Background technique [0002] At present, with the continuous development of cities, the demand for domestic water is increasing, and the sludge generated in the process of urban domestic sewage treatment and its disposal have become an increasingly serious problem. In recent years, although my country has carried out a lot of work in the treatment and disposal of sludge, due to economic and technological reasons, the level of domestic sludge treatment in my country is not high, resulting in extremely low sludge treatment rate, heavy water and light mud. Due to the management and technical defects related to sewage treatment, a large amount of urban sludge can only be temporarily piled up, resulting in the phenomenon of sludge si...

Claims

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Application Information

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IPC IPC(8): C02F11/148
CPCC02F11/148
Inventor 包红旭宋泽斌吕志忠李良玉徐晓红吴洁婷张欣宇金楠珣
Owner LIAONING UNIVERSITY
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