Combined process for sludge treatment

A combined process and sludge treatment technology, applied in the direction of sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc., can solve the difficulty and cost of treatment, reduce to 75%-85%, sludge dry basis weight gain etc.

Inactive Publication Date: 2020-09-18
AWS ENVIRONMENT TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the improvement of sewage treatment standards, the output of sludge has also increased accordingly. At present, the annual production of sludge with a moisture content of 80% can reach more than 50 million tons, and the sludge problem is becoming more and more serious.
[0003] In order to improve the filtration and dewatering performance of sludge for later transportation and reduce disposal costs, sludge conditioning is a key treatment step. The commonly used conditioning method is to add organic flocculants (cationic polyacrylamide) or inorganic flocculants (ferric chloride + quicklime), however, the moisture content of sludge conditioned by organic flocculants only drops to 75%-85% after mechanical dehydration, and the increased disposal cost
The sludge conditioned by inorganic flocculants (ferric chloride + quicklime) can be dehydrated quickly, but the dry weight of the sludge increases, and the chlorine-containing filtrate increases the difficulty and cost of treatment, and the filter cake contains chlorine, which is not conducive to incineration deal with

Method used

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  • Combined process for sludge treatment
  • Combined process for sludge treatment
  • Combined process for sludge treatment

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0044] This embodiment provides a combined process for sludge treatment, including the following steps:

[0045] 1) Take 100kg (about 100L) of sludge with a moisture content of about 98.5%, and pour all into the conditioning tank;

[0046] 2) Adjust the pH of the sludge to 3 with 50% sulfuric acid, and add Fe 2+ , The addition amount is 35g / (kg dry sludge), after mechanical stirring for 5min, add H 2 O 2 , Add 30g / (kg dry sludge), mechanically stir for 30min, add CaO, add 100g / (kg dry sludge), stir for 5min; after treatment, the average particle size of sludge is 48.06μm, and the dry sludge matrix increases 10.6% weight.

[0047] 3) Start the plunger pump to transport the sludge in the conditioning tank to the diaphragm plate and frame filter press. The inlet pressure is maintained at 1.6MPa for a duration of 1h; after all the sludge is delivered to the filter press, the press pump is started for compression Filter, the pressure is set to 2.5MPa, the filter pressure curve is as fig...

Embodiment 2

[0051] This embodiment provides a combined process for sludge treatment, including the following steps:

[0052] 1) Take 100kg (about 100L) of sludge with a moisture content of about 98.2%, and pour all into the conditioning tank;

[0053] 2) Adjust the pH of the sludge to 3 with 50% sulfuric acid, and add Fe 2+ , The dosage is 70g / (kg dry sludge), after mechanical stirring for 5min, add H 2 O 2 , Add 30g / (kg dry sludge), mechanically stir for 30min, add CaO, add 60g / (kg dry sludge), stir for 5min; the average particle size of the sludge after treatment is 46.05μm, and the dry sludge matrix increases It weighs 8.4%.

[0054] 3) Start the plunger pump to transport the sludge in the conditioning tank to the diaphragm plate and frame filter press. The inlet pressure is maintained at 1.6MPa for a duration of 1h; after all the sludge is delivered to the filter press, the press pump is started for compression Filter, the pressure is set to 2.5MPa, the filter pressure curve is as image 3 ...

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Abstract

The invention discloses a combined process for sludge treatment, and relates to the field of sludge treatment. The combined process comprises the following steps: 1) sludge conditioning: sequentiallyadding sulfuric acid, ferrous ions, a hydrogen peroxide solution and a metal oxide into to-be-treated sludge, stirring and carrying out an advanced oxidation reaction; 2) dehydration treatment: sending the sludge treated in the step 1) into a dehydration device for a dehydration treatment; 3) crushing and screening: feeding the sludge treated in the step 2) into a crusher, crushing, adding a biomass raw material, fully mixing, and feeding the crushed sludge into a screen for screening; and 4) granulation: feeding the sludge treated in the step 3) into a granulator for granulation. The sludge is conditioned by using an advanced oxidation method, so that the dry basis weight gain of the sludge is effectively reduced, no chloride ion is added in the treatment process, and the treatment difficulty and cost of filtrate are reduced. Dehydrated sludge is mixed with a biomass raw material for granulation, and can be used as a raw material for incineration of a biomass power plant.

Description

Technical field [0001] The invention belongs to the field of sludge treatment, and specifically relates to a combined process for sludge treatment. Background technique [0002] With the development of the economy and the improvement of people's living standards, the requirements for water quality have also increased. However, as the sewage treatment standards are raised, the output of sludge has also increased accordingly. At present, the annual production of sludge with a moisture content of 80% can reach more than 50 million tons, and the sludge problem has become more and more serious. [0003] In order to improve the filtration and dewatering performance of sludge for later transportation and reduce disposal costs, sludge conditioning is a key treatment step. The commonly used conditioning method is to add organic flocculants (cationic polyacrylamide) or inorganic flocculants (ferric chloride + Quicklime), however, the moisture content of the sludge conditioned by organic flo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06C02F11/145C02F11/143C02F11/12C02F11/02C02F11/122C02F11/00C10L5/46
CPCC02F11/06C02F11/145C02F11/143C02F11/12C02F11/122C02F11/00C10L5/46Y02E50/30Y02E50/10
Inventor 赵皓翰
Owner AWS ENVIRONMENT TECH LTD
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