Biological excess sludge deep dehydration conditioner

A technology of excess sludge and deep dewatering, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problem of large dosage of chemical conditioning sludge conditioner, loss of calorific value of sludge organic matter, and unfavorable excess sludge incineration. and other problems, to achieve the effect of self-sustained incineration, enhanced sludge dewatering performance, and enhanced dewatering effect

Inactive Publication Date: 2016-07-13
JIANGNAN UNIV
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Problems solved by technology

[0003] In order to promote the development of sludge incineration technology that can stabilize all sludge organic matter, kill pathogens, and minimize sludge volume and heavy metal hazards, it is necessary to solve the problem of large dosage of chemically tempered sludge conditioners and corrosion of incineration equipment. , Severe loss of sludge organic matter and lower calorific value are not conducive to the incineration of excess sludge

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  • Biological excess sludge deep dehydration conditioner
  • Biological excess sludge deep dehydration conditioner
  • Biological excess sludge deep dehydration conditioner

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Sludge dewatering effect under different bamboo powder dosage conditions of embodiment 1

[0044] Get agricultural waste bamboo powder (particle diameter is lower than 100 orders) respectively, add by dry sludge mass ratio 0%, 10%, 20%, 30%, 40% and 50%, as sludge dehydration conditioning agent, and After the sludge is stirred and mixed, the sludge is deeply dehydrated.

[0045] 1. Sludge dehydration rate

[0046] When using bamboo powder as a sludge conditioner to condition sludge, different dosages of bamboo powder have different effects on sludge filtration rate and filtrate volume, as shown in figure 1 shown. from figure 1 It can be seen that compared with no bamboo powder, the sludge yield rate and filtrate volume after bamboo powder conditioning were slightly increased, and the effect was more obvious at 40% dosage. The pumping time is reduced by an average of 60-300s. This is because the skeleton support structure of bamboo powder increases the sludge floc an...

Embodiment 2

[0053] Sludge dewatering effect when embodiment 2 bamboo powder is coupled with PAM

[0054] PAM dosage ratio is 0.3%, get agricultural waste bamboo powder (particle size is lower than 100 orders) respectively, add by dry sludge mass ratio 0%, 10%, 20%, 30%, 40% and 50%, Coupled with PAM as a sludge dehydration conditioner, the sludge is deeply dehydrated.

[0055] 1. Sludge dehydration rate

[0056] When bamboo powder and 0.3% PAM are used as sludge conditioners to condition sludge, different dosages of bamboo powder have different effects on sludge filtration rate, such as Figure 5 shown. It can be seen from the figure that the difference in suction filtration rate and filtrate volume is small when adding different amounts of bamboo powder, but when the addition ratio of bamboo powder is 30% and 50%, the filtrate volume and suction filtration rate are larger ; When the addition ratio of bamboo powder is 30%, compared with single addition, the suction filtration time is r...

Embodiment 3

[0061] Example 3 Bamboo powder, sludge dry basis calorific value comparison after conditioning

[0062] Figure 8 The effects of different dosages of lime and bamboo powder on the calorific value of conditioned sludge on dry basis were described. from Figure 8 It can be seen from the figure that with the increase of CaO dosage, the sludge wall is broken under the action of high temperature (80°C) and high pH (11-12), and a large amount of organic matter is transferred to the liquid phase, and its calorific value increases accordingly. reduce. When the dosage is 50%, its calorific value drops by about 33%, only 6793kJ / kg. Although the use of CaO can reduce the moisture content of the sludge, it is not suitable to use CaO for dehydration.

[0063] When bamboo powder is added, the calorific value of the sludge increases gradually. On the one hand, because bamboo powder is organic matter, adding it will increase the calorific value. The microbial cell structure of sludge make...

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Abstract

The invention discloses a biological excess sludge deep dehydration conditioner and belongs to the field of sludge treatment and disposal.Agricultural waste bamboo powder serves as a dehydration conditioner, thick, large and compact sludge flocs are formed by means of the skeleton builder function of the dehydration container, sludge specific resistance is reduced, and the dehydration effect of sludge is enhanced.The bamboo powder takes the place of ferric chloride and calcium oxide, the bamboo powder and polyacrylamide serve as the sludge conditioner to treat sludge, water content of sludge cakes is reduced to 58.74%, the content of polysaccharides in a suction filtration solution is increased, that is, the EPS content in the sludge cakes is reduced and sludge dehydration performance is enhanced.Meanwhile, the heat value of sludge is increased to 9718 kJ / kg, and self-maintaining incineration of sludge is facilitated.Besides, the biological excess sludge deep dehydration conditioner further avoids the risk that when CaO is used, the heat value is reduced and not beneficial to incineration, and lays a foundation for resource utilization and popularization of agricultural waste and sludge.

Description

technical field [0001] The invention relates to a bio-based excess sludge deep dehydration conditioner, which belongs to the field of sludge treatment and disposal. Background technique [0002] As of the end of June 2015, a total of 3,802 urban sewage treatment plants have been built in cities and counties across the country, with a sewage treatment capacity of about 161 million cubic meters per day. The improvement of sewage treatment capacity will inevitably be accompanied by the generation of a large amount of excess sludge. In the case of continuous growth, the treatment and disposal technology is not yet perfect, and the treatment and disposal standards are becoming stricter, the sludge deep dewatering technology is particularly important. At the same time, due to the high sand content and heavy metal concentration of sludge, it will significantly affect the effect of anaerobic digestion and land use of sludge, so it is more appropriate to use sludge incineration. For...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
CPCC02F11/14
Inventor 王硕陈晓光杨艳坤李激杨倩倩
Owner JIANGNAN UNIV
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