Method for realizing anti-shrinkage recarburization sludge drying

A sludge drying and anti-shrinkage technology, which is applied in dewatering/drying/concentrating sludge treatment, energy and wastewater treatment, etc., can solve problems such as unfavorable activated carbon firing, unfavorable heat treatment, low organic carbon content in sludge, etc. Conducive to the effect of subsequent carbon quality, reducing tar production and increasing carbon content

Active Publication Date: 2016-04-13
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of dense dry sludge formed due to water escape in the existing sludge drying method, which is not conducive to subsequent heat treatment, and the organic carbon content in the sludge is low, which is not conducive to the subsequent burning of activated carbon, etc. In order to solve the problem of sludge drying, we use organic pore-forming agent, carbon materi

Method used

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  • Method for realizing anti-shrinkage recarburization sludge drying

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Embodiment 1

[0046] According to the organic pore-forming agent formula, mix natural fibers such as starch, sawdust, wood chips and straw (1:1:1:1), use the cellulose and other components as pore-forming agents, and then add polyvinyl chloride, polyvinyl chloride, etc. One or several components of styrene, polyvinyl alcohol and resin are used as aggregates, the mass ratio of the pore-forming agent to aggregates is controlled at 50%:50%, and 0.4mol / L KOH is added as a catalyst , the mass ratio of the catalyst to the organic pore-forming agent is 1:1. Mix the prepared organic pore-forming agent and catalyst with the dehydrated sludge dry basis, the dosage of the organic pore-forming agent is 5% of the dehydrated sludge dry basis, and the moisture content of the sludge is 80% %,well mixed. After 15 minutes, the capillary water absorption time of the sludge increased from 3700s of the original sludge to 4357s, pumped in with a high-pressure pump, and evenly distributed in the solar interlayer...

Embodiment 2

[0048] According to the organic pore-forming agent formula, mix natural fibers such as starch, sawdust, wood chips and straw, use the cellulose and other components as pore-forming agents, combine polyvinyl chloride, polystyrene, polyvinyl alcohol and resin in One or several components are used as aggregates, and the mass ratio of the two is controlled at 40%:60%. At the same time, 0.6mol / L KOH with the same mass as the organic pore-forming agent is added as a catalyst and mixed with sludge. The dosage of the pore-forming agent is 15% of the dry basis of the dehydrated sludge, wherein the moisture content of the sludge is 80%, and the mixture is uniform. After 15 minutes, the capillary water absorption time of the sludge increased from 3700s of the original sludge to 4654s, pumped in with a high-pressure pump, evenly distributed in the solar interlayer drying system, and dried under normal sunlight conditions. The temperature in the interlayer during the day is 38 Fluctuating ...

Embodiment 3

[0050] According to the formula of organic pore-forming agent, mix natural fibers such as starch, sawdust, wood chips, and straw arbitrarily, use the cellulose and other components in it, combine polyvinyl chloride, polystyrene, polyvinyl alcohol, and resin, etc. Components, the ratio of which is controlled at 30%:70%, while adding an equal mass of 0.7mol / L KOH, and mixing with the sludge at a mass ratio of 20% of the sludge dry basis, wherein the moisture content of the sludge is 80% , mixed evenly, after 15 minutes, the capillary water absorption time of the sludge increased from 3700s of the original sludge to 4807s, pumped in with a high-pressure pump, uniformly distributed in the solar interlayer drying system, and dried under normal sunlight conditions. The temperature fluctuates between 38-80°C during the day, and the time required for the moisture content to drop from 80% to 20% is 1.5d (the actual effective time is 12h), while the simple solar drying without adding an ...

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Abstract

A method for realizing anti-shrinkage recarburization sludge drying is characterized in that an organic pore-forming agent and a catalyst are added into a sludge dry basis subjected to centrifugal dewatering to be uniformly mixed, distributing is carried out in a solar power interlayer drying system, and through the organic combination of the synergistic effect of framework construction and the pore-forming agent and solar power drying, a low-shrinkage recarburization function on the basis of realizing quick sludge drying is realized, wherein the organic pore-forming agent comprises 50-80% of a pore-forming agent and 20-50% of an aggregate according to the mass ratio; the pore-forming agent is prepared by mixing one or more of natural fibers such as starch, saw dust, sawdust and crop stalks according to an arbitrary ratio; the aggregate is prepared by mixing one or more of high-molecular polymers such as polyvinyl chloride, polystyrene, polyvinyl alcohol and resin according to an arbitrary ratio; the catalyst is the KOH solution with the concentration of greater than or equal to 0.4 mol/L, and the mass ratio of the catalyst to the organic pore-forming agent is 1:1, and the adding amount of the organic pore-forming agent is 5-30% of that of the sludge dry basis. According to the method, the dried sludge size is reduced, and when the sludge moisture content is less than 20%, the dried sludge size is reduced to 16.4-52.2% of the original size of sludge; after pyrolysis, the carbon recovery rate is increased by 20-30%, and BET is increased by 40-120%.

Description

technical field [0001] The invention relates to a solid waste treatment method, in particular to a method for reducing drying shrinkage and increasing sludge carbon content under the assistance of solar energy for sludge drying, which belongs to the technical field of environmental protection. Background technique [0002] With the continuous improvement of my country's urban sewage treatment rate, the sludge output of urban sewage treatment plants has also increased sharply. As of the end of June 2013, 3,479 urban sewage treatment plants have been built nationwide, with a sewage treatment capacity of about 120 million cubic meters per day. The most direct result of the large-scale construction and operation of sewage treatment plants is a substantial increase in the amount of sludge. It is predicted that by 2015, the annual output of wet sludge (with a water content of 80%) in urban sewage treatment plants will reach 33.59 million tons, that is, 92,000 tons of sludge per d...

Claims

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Application Information

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IPC IPC(8): C02F11/12C02F11/14
CPCY02W10/37C02F11/12C02F11/14
Inventor 楼紫阳朱南文周品尹常凯胡静朱世杰袁海平
Owner SHANGHAI JIAO TONG UNIV
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