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Method for conditioning and modifying sludge generated in landfill leachate

A technology for landfill leachate and sludge conditioning, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc. Conditioning and modifying agents cannot be used to achieve the effect of increasing the water effluent speed and reducing the specific resistance of sludge

Inactive Publication Date: 2019-04-09
湖州智清环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of a large number of membrane systems, the water cannot contain a large number of metal ions that affect the membrane flux or cause membrane pollution, such as calcium, aluminum, iron, magnesium, silicon, etc., because the size of these metal ions is similar to the pore size of the membrane, so it is very easy to block. Membrane, which affects the effect and service life of the membrane
[0004] Therefore, the dewatering of landfill leachate sludge cannot use conditioning modifiers containing such metal ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The solid content of the sludge produced by landfill leachate is 3.5%, the pH is neutral, and the mud is earthy red.

[0021] The conditioning modification tank is 50 cubic meters, and the paddle type stirring speed is 80 rpm.

[0022] The filling coefficient of the conditioning modified tank is 70%, that is, the amount of sludge per tank is 35 cubic meters.

[0023] According to the 4.0% (DS) ratio, the dosing amount of the new organic composite conditioning modifier is 49 kg, and diluted with water to 2000 kg, at this time the concentration of the modifier is 2.45%.

[0024] Add the diluted agent into the modified tank through the delivery pump, and stir until dense and stable flocs are formed.

[0025] According to the 20% (DS) ratio, the dosing amount of the solid skeleton powder is 245 kg, and it is added into the modified tank and stirred evenly.

[0026] The conditioned and modified sludge is transported to a 300-square-diaphragm plate filter press through a sc...

Embodiment 2

[0029] The landfill leachate sludge has a water content of 80% and a water content of 98.5% and is mixed according to a certain ratio. After mixing, the solid content of the sludge is 5.0%, the pH is neutral, and the mud is black.

[0030] The conditioning modification pool is 100 cubic meters, and the paddle-type stirring speed is 80 rpm.

[0031] The charging coefficient of the conditioning modified tank is 70%, that is, the amount of sludge in each tank is 70 cubic meters.

[0032] According to the proportion of 3.0% (DS), the dosing amount of the new organic compound conditioning modifier is 105 kg, and diluted with water to 4000 kg, at this time the concentration of the modifier is 2.62%.

[0033] Add the diluted agent into the modified tank through the delivery pump, and stir until dense and stable flocs are formed.

[0034] According to the ratio of 10% (DS), the dosing amount of solid skeleton powder is 350 kg, and it is added into the modified tank and stirred evenly...

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Abstract

The invention relates to a method for conditioning and modifying sludge generated in landfill leachate. The method comprises the following steps: diluting organic compound conditioning modifier to a solution having the concentration of 0.1-5percent (W / W); uniformly stirring in landfill leachate sludge, and keeping the sludge concentration to be 1-10 percent; uniformly stirring with 5-60 percent ofsolid frame powder; delivering through a feed pump to dehydration equipment, and dehydrating; and controlling the water content of output mud cake. The method for conditioning and modifying sludge generated in landfill leachate is environment-friendly since the special organic compound sludge conditioning modifier and solid frame powder are adopted to replace existing conditioning modifying agentwith metal ion ingredients, and can greatly reduce the sludge specific resistance, achieves the aim of deep dehydrating sludge since the free water outlet speed is increased by forming a water filterchannel, and cannot influence the landfill leachate film system.

Description

Technical field: [0001] The invention relates to the technical field of sludge modification, in particular to a method for conditioning and modifying sludge produced from landfill leachate. Background technique: [0002] Landfill leachate refers to the moisture contained in the garbage itself in the landfill, the rain and snow water and other moisture entering the landfill, deducting the saturated water holding capacity of the garbage and the covering soil, and passing through the garbage layer and the covering soil. A high concentration of organic wastewater. Leachate is the product of gravity flow of liquid in a landfill, mainly from precipitation and the embedded water of the waste itself. Since many factors may affect the properties of the leachate during the flow of the liquid, including physical factors, chemical factors and biological factors, the properties of the leachate vary within a considerable range. Generally speaking, its pH value is between 4~9, COD is in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/147C02F11/148C02F11/121C02F103/06
CPCC02F11/121C02F11/14C02F2103/06
Inventor 汪国成
Owner 湖州智清环保科技有限公司
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