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Sludge deep dehydration method and application of sludge

A deep dehydration and sludge technology, applied in water/sludge/sewage treatment, sludge treatment, electrochemical sludge treatment, etc., can solve the problems of low treatment efficiency, large investment, high operating cost, etc., and achieve simple operation methods , high economic benefits, and the effect of improving dehydration performance

Pending Publication Date: 2021-08-13
ZHEJIANG GONGSHANG UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are roughly several types of sludge drying and dehydration commonly used in my country's current industry: thermal drying, mechanical dehydration, thermal-mechanical superimposed combination devices, etc. These methods have the disadvantages of low treatment efficiency, large investment, and high operating costs.

Method used

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  • Sludge deep dehydration method and application of sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take the sludge with a water content of 84.2% after dehydration by a plate and frame filter press from the sludge treatment plant, add lime with a sludge quality of 8‰, and shale with a sludge quality of 6‰, and mix evenly; send it to the electric filter press Drying and dehydration are carried out inside, the operating voltage is 22.4V, the operating current is 2.2A, the mechanical pressure is 1Mpa, and the action is 10min; after dehydration, the moisture content of the sludge reaches 58.1%.

[0037] The dried sludge is mixed with fly ash, internal combustion coal and clay at a ratio of 10% of the total mass, crushed and stirred evenly, extruded to make adobe bricks; the adobe bricks are placed in a drying room, and the drying temperature is The temperature is 190°C, and the drying time is 48 hours; finally, the dried adobe bricks are fired in a kiln with a maximum firing temperature of 1000°C for 100 minutes to obtain finished bricks, which meet the relevant constructi...

Embodiment 2

[0039] Take the sludge with a water content of 85.2% after dehydration by a plate and frame filter press from the sludge treatment plant, add lime with a sludge quality of 4‰, and shale with a sludge quality of 8‰, and mix evenly; send it to the electric filter press Drying and dehydration are carried out inside, the operating voltage is 22.4V, the operating current is 2.2A, the mechanical pressure is 1Mpa, and the action is 10min; after dehydration, the moisture content of the sludge reaches 57.7%.

[0040] The dried sludge is mixed with fly ash, internal combustion coal and clay at a ratio of 10% of the total mass, crushed and stirred evenly, extruded to make adobe bricks; the adobe bricks are placed in a drying room, and the drying temperature is The temperature is 200°C, and the drying time is 48 hours; finally, the dried adobe bricks are fired in a kiln with a maximum firing temperature of 1100°C for 90 minutes to obtain finished bricks, which meet the relevant constructio...

Embodiment 3

[0042] Take the sludge with a moisture content of 82.8% after dehydration with a plate and frame filter press from the sludge treatment plant, add lime with a sludge quality of 4‰, and shale with a sludge quality of 6‰, and mix evenly; send it to the electric filter press Drying and dehydration are carried out inside, the operating voltage is 22.4V, the operating current is 2.2A, the mechanical pressure is 2Mpa, and the action is 10min; after dehydration, the moisture content of the sludge reaches 54.1%.

[0043] The dried sludge is mixed with fly ash, internal combustion coal and clay at a ratio of 12% of the total mass, crushed and stirred evenly, and extruded to make adobe bricks; the adobe bricks are placed in a drying room, and the drying temperature is The temperature is 210°C, and the drying time is 48 hours; finally, the dried adobe bricks are fired in a kiln with a maximum firing temperature of 1150°C for 150 minutes to obtain finished bricks, which meet the relevant c...

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Abstract

The invention provides a sludge deep dehydration method and application of sludge, and belongs to the field of sludge treatment and sludge brickmaking. The method comprises the following steps: firstly, adding shale and lime into the sludge, and then carrying out voltage filtration treatment to partially remove free water, interstitial water, adsorbed water and bound water in the sludge, so that the water content of the sludge is reduced to 60% or below from 80% or above, the capillary water absorption time of the sludge is shortened, and the dehydration performance of the sludge is improved. And the original properties of the sludge cannot be changed by adding the shale and the lime, so that the molding and structural performance of bricks cannot be influenced when the dried sludge is used for making the bricks. The operation method is simple, low in energy consumption and cost and high in economic benefit; and the method has important significance on reduction, harmlessness and recycling of the sludge.

Description

technical field [0001] The invention belongs to the field of sludge treatment and sludge brick making, and in particular relates to a method for deep dehydration of sludge and the application of sludge. Background technique [0002] Surplus sludge is an inevitable by-product after sewage treatment, and it is also a resource with economic value. In recent years, with the growth of urban population and the continuous improvement of municipal service facilities, the total amount of sewage treatment in my country has continued to increase every year, and the sludge output has also increased. Up to now, there are more than 4,000 sewage treatment plants in operation in my country, and the treated sewage reaches 1.5×10 8 m 3 / d, the annual output of excess sludge (water content 80%) is nearly 35 million tons. At present, the sludge disposal methods mainly include land use, landfill, incineration, biochemical treatment and dumping into the sea. However, these methods have certai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/122C02F11/145C02F11/15C10L5/02C10L5/46C02F101/30
CPCC02F11/006C02F11/122C02F2101/30C10L5/02C10L5/46C02F11/145C02F11/15Y02E50/10Y02E50/30
Inventor 蔡美强韦珊珊陈海锋陈雪祥董春颖钱卓慧翁梦婷李政吴琼庞宇昂宋志军施跃锦
Owner ZHEJIANG GONGSHANG UNIVERSITY
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