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Method for achieving deep sludge dehydration and energy utilization on plate-and-frame filter press

A plate and frame filter press, deep dehydration technology, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve the problems affecting the operation efficiency and dehydration effect of the plate and frame filter press, and filtrate flow Increased resistance, narrowed filtrate flow channels, etc., to achieve the effect of simplifying the sludge treatment process, reducing the moisture content, and shortening the discharge time

Inactive Publication Date: 2015-03-25
梁毅 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this equipment is that as the operating pressure of the plate and frame filter press increases, the flow channel of the filtrate inside the filter cake shrinks, the flow resistance of the filtrate increases sharply, and the filter cloth is easily blocked by sludge particles.
Ferric chloride solution can etch copper metal, even stainless steel, and can cause corrosion to sludge treatment equipment. Industrial production requires hydrochloric acid or chlorine gas, which are highly corrosive substances, and the production process will generate a large amount of waste acid.
[0015] None of the above methods can effectively solve the problem of sludge particles clogging the filter medium (filter cloth) and the problem that the flow resistance of the filtrate increases sharply and the filtration speed gradually decreases due to the narrowing of the filtrate flow channel inside the filter cake during the filtration process, which affects the plate and frame pressure. The operating efficiency and dehydration effect of the filter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Use standard coal powder with a fineness of 30 mesh and a calorific value of 29.68MJ / kg as a filter aid, mix the standard coal powder with water, the stirring speed is 60 rpm, the stirring time is 5 minutes, and the mass ratio is 6 % of the suspension, with a slurry pump at a pressure of 0.8MPa, it is introduced into the diaphragm plate and frame filter press for filtration, and a pre-coating is formed on the filter medium. The amount of standard coal powder in the pre-coating is the absolute 10% of dry sludge, or a pre-coat thickness of 3 mm.

[0051] Add standard coal and pulverized coal to the sludge with a water content of 96%, stir and mix evenly, and the added amount accounts for 50% of the absolute dry sludge.

[0052] Then use a screw pump to introduce the sludge mixed with standard coal coal powder into the diaphragm plate and frame filter press at a pressure of 0.8MPa-1.2MPa, and the feeding time is 2 hours to perform press filtration and dehydration. Then ca...

Embodiment 2

[0054] Use the flue high carbon powder with a fineness of 15 mesh and a calorific value of 11.83MJ / kg as the filter medium, mix and stir the high carbon powder with water, the stirring speed is 55 rpm, and the stirring time is 4 minutes. Make a suspension with a mass ratio of 4%, use a slurry pump to introduce a diaphragm plate and frame filter press at a pressure of 0.6MPa to filter, and form a pre-coat on the filter medium. The amount of carbon powder contained in the flue in the pre-coat is required 8% of dry sludge in dewatered sludge, or a pre-coat thickness of 2.5 mm.

[0055] Add high carbon powder in the flue to the sludge with a water content of 96%, stir and mix evenly, and the amount of the addition accounts for 40% of the absolute dry sludge in the sludge to be dehydrated.

[0056] Then use a screw pump to introduce the sludge mixed with high carbon powder in the flue into the diaphragm plate and frame filter press at a pressure of 0.8MPa-1.2MPa, and the feeding ti...

Embodiment 3

[0058] Use coal slime powder with a fineness of 200 mesh and a calorific value of 14.84MJ / kg as a filter medium, mix the coal slime powder with water, the stirring speed is 50 rpm, and the stirring time is 4 minutes, and it is made into a suspension with a mass ratio of 3%. Slurry pump with a pressure of 0.6MPa into the diaphragm plate and frame filter press to filter, forming a pre-coat on the filter medium, the amount of coal slime powder in the pre-coat is the absolute dry sludge in the sludge that needs to be dehydrated 6%, or a pre-coat thickness of 2mm.

[0059] Coal slime powder is added to the sludge with a water content of 96%, stirred and mixed, and the added amount is 30% of the absolute dry sludge amount in the sludge to be dehydrated.

[0060] Then use a screw pump to introduce the sludge mixed with coal slime powder into the diaphragm plate frame filter press with a pressure of 0.8MPa-1.2MPa, and the feeding time is 2 hours to perform press filtration and dehydra...

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Abstract

The invention discloses a method for achieving deep sludge dehydration and energy utilization on a plate-and-frame filter press. The method includes the following steps that firstly, filter aid suspension liquid is prepared, a filter aid and water are mixed in proportion, and the filter aid suspension liquid is prepared; secondly, the filter aid suspension liquid prepared in the first step is conveyed to a filter medium of the plate-and-frame filter press, and a precoat is formed; thirdly, sludge on which dehydration needs to be conducted is doped with the filter aid in the first step, and the use amount of the filter aid is larger than the weight of absolutely-dry sludge in the sludge on which dehydration needs to be conducted by 20 percent; fourthly, the sludge doped with the filter aid is conveyed into the plate-and-frame filter press, filter-pressing dehydrating is conducted on the sludge, and pressing dehydrating is conducted on the sludge after filter-pressing dehydrating. According to the method for achieving deep sludge dehydration and energy utilization, deep dehydrating of the sludge is achieved, automatic discharging can be achieved, efficiency is obviously improved, the operation cost is obviously reduced, conditions are created for energy utilization of the sludge, and an obtained filter cake can be used as the raw materials for combustion of plants or other incinerators to be incinerated or used as the raw material of cement plants to be co-processed.

Description

technical field [0001] The invention relates to a method for realizing deep dehydration of sludge and energy conversion of sludge treatment by using a plate and frame filter press and a filter aid with a certain calorific value, belonging to the technical field of sludge treatment. Background technique [0002] The principle of sludge treatment in sewage treatment plants is to stabilize, reduce, and harmless, and further realize the utilization of sludge resources. At present, most of the industrial and domestic sewage sludge in our country is simply stockpiled, without standardized treatment, which can easily cause secondary pollution. Treatment and disposal methods such as landfill, incineration, fertilizer, and cement kiln co-processing are also struggling due to large investment and high operating costs. One of the important reasons is that the moisture content of the sludge treated by the conventional process is mostly 65%-80%, and a large production cost is spent in t...

Claims

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Application Information

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IPC IPC(8): C02F11/14
CPCY02W10/30C02F11/122C02F11/14C02F2303/06
Inventor 不公告发明人
Owner 梁毅
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