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Solar-power-based sludge low-shrinkage energy-saving drying method

A solar energy, low shrinkage technology, applied in chemical instruments and methods, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve problems such as unfavorable heat treatment, and achieve sludge reduction and acceleration. The effect of drying and dehydration and improving the drying rate

Active Publication Date: 2016-06-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that in the existing sludge drying method, the dense dried sludge formed due to the escape of water is not conducive to the subsequent heat treatment. , combined with solar interlayer drying, to achieve the effect of improving the properties of sludge after drying and benefiting the subsequent resource utilization, thereby greatly improving social and economic benefits

Method used

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Effect test

Embodiment 1

[0044] Ammonium carbonate, magnesium oxide, kelp powder, and UEA calcium sulfoaluminate expansion agent are used to prepare the puffing conditioner, the mass ratio of which is 40%: 20%: 30%: 10%, and mixed with sludge. The amount added is 5% of the dry basis of the sludge, of which the moisture content of the sludge is 80%, mixed evenly, 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 decrease from 80% to 20% is 2 days (the actual effective time is 18 hours), while the simple solar drying without adding puffing conditioner needs 3.5 hours to achieve the same requirement. d (The actual exposure time of sunlight is 32h). Compared with adding puffing conditioner and without adding puffing conditioner, the sludge density is from 1.0465g / cm 3 Raised to 1.7134g / cm 3 , The volume ha...

Embodiment 2

[0046] Ammonium bicarbonate, magnesium chloride, seaweed powder and UEA calcium sulfoaluminate expansion agent are used to prepare the puffing conditioner, and its mass ratio is 60%: 10%: 25%: 5%, and mixed with sludge, wherein the water content of sludge 88%, the dosage of the puffing conditioner is 10% of the dry basis of the sludge, mixed evenly, after 15 minutes, the capillary water absorption time of the sludge increased from 3700s of the original sludge to 4206s, and it was pumped in with a high-pressure pump. In the solar interlayer drying system, the fabric is evenly distributed and dried under normal sunlight conditions. The temperature in the interlayer fluctuates between 38-80°C during the day, and the time required for the moisture content to decrease from 88% to 20% is 2 days (the actual effective time is in 24h), and pure solar drying without adding puffing conditioner, it takes 4d to meet the same requirements (the actual exposure time of sunlight is 36h). As a ...

Embodiment 3

[0048] Ammonium carbonate, calcium oxide, blue-green algae powder and UEA calcium sulfoaluminate expansion agent are used to prepare the puffing conditioner, the mass ratio of which is 50%: 15%: 27%: 8%, and mixed with sludge, the throwing of the puffing conditioner The amount added is 15% of the dry basis of the sludge, and the moisture content of the sludge is 92%. Mix evenly. After 15 minutes, the capillary water absorption time of the sludge increases from 3700s of the original sludge to 4206s. Evenly distribute the fabric in the interlayer solar drying system, and dry it under normal sunlight conditions. The temperature in the interlayer fluctuates between 38-80°C during the day, and the time required for the moisture content to decrease from 92% to 20% is 2 days (the actual effective time is in 24h), and pure solar drying without adding puffing conditioner, it takes 4d to meet the same requirements (the actual exposure time of sunlight is 44h). The volume of sludge has s...

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Abstract

The invention relates to a solar-power-based sludge low-shrinkage energy-saving drying method. The method is characterized in that a bulking conditioner is added into sludge subjected to centrifugal dehydration, uniformly mixed and distributed, and the mixture enters a solar-power interlayer drying system; and the conditioning effect of the bulking conditioner is combined with the solar-power interlayer drying process to complete the framework establishment, bulking conditioner implantation and photocatalytic reaction, thereby implementing the low-shrinkage drying on the sludge on the premise of increasing the sludge drying rate. The bulking conditioner is formed by sufficiently and uniformly stirring the following components in percentage by mass: 40-60% of ammonium carbonate / ammonium bicarbonate, 10-20% of magnesium oxide / magnesium chloride / calcium oxide, 10-30% of Laminaria digitata powder / seaweed powder / blue algae powder and 5-10% of UEA calcium sulphoaluminate bulking agent. The addition amount of the bulking conditioner is 5-20% of the sludge on dry basis. The solar-power heating drying effect and the combined action of the bulking conditioner for conditioning the sludge are utilized, thereby establishing the sludge drying basic structure and being beneficial to the pore forming and shrinkage resistance in the subsequent sludge heat treatment.

Description

technical field [0001] The invention relates to a solid waste treatment method, in particular to a method for drying and dehydrating sludge with low shrinkage assisted by solar energy, and belongs to the technical field of environmental protection. Background technique [0002] Generally, the water content of the sludge in the secondary sedimentation tank of the sewage plant is 97% to 99%, of which the interstitial water accounts for about 70%, the capillary water accounts for about 20%, the adsorbed water is about 7%, and the intracellular water is about 3%. Before the remaining sludge is treated and disposed of, the high water content in the sludge needs to be effectively removed, and through general dehydration treatment, such as centrifugal dehydration, plate and frame filter press, etc., the final water content is still between 75-85%. The water form in the sludge is mainly adsorbed water and intracellular water. Therefore, ordinary filter presses and centrifugal dehyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/12
CPCY02W10/37C02F11/14C02F11/12C02F2303/06
Inventor 楼紫阳朱南文周品尹常凯胡静王辉袁海平
Owner SHANGHAI JIAO TONG UNIV
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