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Energy-saving quick dewatering method of argillaceous biomass refuse

A biomass and mud technology, which can be used in energy and wastewater treatment, polluted waterway/lake/pond/river treatment, dehydration/drying/concentrated sludge treatment, etc., which can solve the problem of low efficiency and low solar heat utilization efficiency. , the slow drying speed of solar energy, etc., to achieve the effect of improving efficiency

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 problems of low efficiency, slow solar drying speed, and low solar heat utilization efficiency in the existing sludge dewatering method, and adopt the method of adding gelling dehydrating agent combined with solar direct drying to utilize gelation The dewatering agent adjusts the properties of the sludge, making the sludge form hydrophobicity, quickly migrating the water inside the sludge to the surface, and quickly increasing the evaporation of the surface water in the sludge, thereby improving the drying efficiency and realizing the energy saving of muddy biomass waste Quickly remove water, improve the social and economic benefits of sludge drying

Method used

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  • Energy-saving quick dewatering method of argillaceous biomass refuse

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Experimental program
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Effect test

Embodiment 1

[0041] According to the formula of the gelling dehydrating agent, the gelling dehydrating agent is composed of magnesium oxide, cationic polymer, CaO and ferric chloride uniformly mixed, and its mass ratio is 25%: 40%: 25%: 10%, and then mixed with The muddy biomass waste is mixed, and the dosage of the gelling water-removing agent is 5% of the sludge dry basis mass of the muddy biomass waste after dehydration, wherein the water content of the muddy biomass waste 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. It takes 2 days for the % to decrease to 20% (the actual effective time is 18 hours), and the simple solar drying without adding gelling dehydrating agent needs 3.5 days to achieve the same effect (the actual sunlight irradiation time is 32 hours). The moisture content was tested using the "Testing Methods for Sludge from Municipal Sewage Treatment Plants...

Embodiment 2

[0043] According to the formula of the gelling dehydrating agent, the gelling dehydrating agent is composed of magnesium oxide, cationic polymer, CaO and ferric chloride uniformly mixed, and its mass ratio is 60%: 20%: 10%: 10%, and then mixed with The muddy biomass waste is mixed, and the dosage of the gelled water-removing agent is 10% of the sludge dry basis mass of the muddy biomass waste after dehydration, wherein the water content of the muddy biomass waste is 88%. , mixed evenly, injected with a high-pressure pump, evenly distributed in the solar interlayer drying system, and dried under normal sunlight conditions. It takes 2 days for the % to decrease to 20% (the actual effective time is 24 hours), while the simple solar drying without adding gelling dewatering agent needs 4 days to achieve the same effect (the actual sunlight irradiation time is 36 hours). The moisture content was tested using the "Testing Methods for Sludge from Municipal Sewage Treatment Plants" (CJ...

Embodiment 3

[0045] According to the formula of the gelling dehydrating agent, the gelling dehydrating agent is composed of magnesium chloride, cationic polymer, CaO and ferric chloride, and its mass ratio is 35%: 30%: 15%: 20%. The amount of the gelled water-removing agent is 15% of the sludge dry weight of the dehydrated muddy biomass waste, wherein the water content of the muddy biomass waste is 92%. Mix evenly, spread evenly in the solar interlayer drying system with a screw feeder, dry under normal sunlight conditions, the temperature in the interlayer fluctuates between 38-80°C during the day, and the moisture content of muddy biomass waste is from 92% The time required to reduce to 20% is 2 days (the actual effective time is 24 hours), while the simple solar drying without adding gelling dewatering agent needs 4 days to achieve the same effect (the actual sunlight irradiation time is 44 hours). The moisture content was tested using the "Testing Methods for Sludge from Municipal Sewa...

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Abstract

The invention relates to an energy-saving quick dewatering method of argillaceous biomass refuse. A gelation dewatering agent is added into the argillaceous biomass refuse and uniformly mixed, and the mixture enters a solar interlayer drying system and is distributed; the gelation dewatering agent is utilized to condition the argillaceous biomass refuse to form hydrophobicity; part of heat released by the chemical reaction between the gelation dewatering agent and argillaceous biomass refuse is utilized for dewatering, so that internal water quickly transfers to the surface and is evaporated; and thus, the water and sludge in the argillaceous biomass refuse are effectively separated, thereby implementing quick breakdown of the internal structure, and achieving the energy-saving quick dewatering on the argillaceous biomass refuse in combination with the direct drying action of solar power. The gelation dewatering agent is composed of the following components in percentage by mass: 25-60% of magnesium oxide or magnesium chloride, 20-40% of cationic polymer, 10-35% of CaO and 10-20% of ferric chloride. The addition amount of the gelation dewatering agent is 5-20 wt% of the argillaceous biomass refuse (on dry basis). The method has the advantages of high drying efficiency and high drying speed, and can save the drying time by 30% or above as compared with the direct solar drying; and the dried sludge can directly enter the recovery stage.

Description

technical field [0001] The invention relates to a solid waste treatment method, in particular to an energy-saving and fast water removal method for argillaceous biomass waste, and 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. It is predicted that by 2015, the annual output of wet sludge (with a moisture content of 80%) in urban sewage treatment plants will reach 33.59 million tons, that is, 92,000 tons of sludge per day. One of the biggest problems with excess sludge is its high water content. Generally, the water content of sludge in secondary sedimentation tanks in sewage plants is 97% to 99%, of which interstitial water accounts for about 70%, capillary water accounts for about 20%, and adsorbed water accounts for about 7%, intracellular water is about 3%. Through general d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
CPCY02W10/37C02F11/14C02F2103/007
Inventor 楼紫阳朱南文周品袁海平尹常凯胡静孙中涛
Owner SHANGHAI JIAO TONG UNIV
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