Deep dehydration method of sludge after domestic sewage treatment

A deep dehydration and domestic sewage technology, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of excessive alkalinity of the filtrate, difficulty in treatment, increase in solid sludge, etc., and achieve the goal of increasing flocculation to adjust pH and moderate acidity and alkalinity Effect

Inactive Publication Date: 2015-07-22
北京同创碧源水务科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the need to add iron trichloride in the implementation of the above-mentioned process, the mud cake after extrusion dehydration just contains the composition of chlorine, and in the follow-up mud cake disposal (burning) can produce chloride composition, causing serious damage to the environment Pollution
In addition, becau

Method used

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Examples

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Example Embodiment

[0013] Example 1

[0014] The invention provides a method for deep dehydration of sludge after treatment of domestic sewage, which comprises the following steps:

[0015] Source of raw mud: Beixiaohe Sewage Treatment Plant, the PH value of raw mud is 6.5;

[0016] A. Dilute the preliminary dewatered sludge from domestic water with a moisture content of over 80% with water to a moisture content of 94%. Add 4.5 kg of ferrous sulfate to 100 kg of sludge at the ratio of 99.5% pure hydrated sulfurous sulfate Iron or ferrous sulfate 6-hydrate, then stir for 10 minutes;

[0017] B. Add 30% hydrogen peroxide to the sludge obtained in step A at the ratio of 100 kg of sludge to 1.8 kg of hydrogen peroxide, and then stir for 10 minutes;

[0018] C. Add ammonia water with an ammonia content of 20% to the sludge obtained in step B according to the ratio of 100 kg of sludge to 1.6 kg of ammonia water, adjust the pH of the sludge water to 5-6.5, and then stir for 10 minutes; finally use the sludge T...

Example Embodiment

[0020] Example 2

[0021] The invention provides a method for deep dehydration of sludge after treatment of domestic sewage, which comprises the following steps:

[0022] Source of raw mud: Changping Sewage Treatment Plant, PH value of raw mud is 7;

[0023] A. Dilute the preliminary dewatered sludge from domestic water with a moisture content of more than 80% with water to a moisture content of 94%, and add 5 kg of ferrous sulfate to 100 kg of sludge at the ratio of 99.5% pure hydrated sulfurous sulfate Iron or ferrous sulfate 6-hydrate, then stir for 15 minutes;

[0024] B. Add 30% hydrogen peroxide to the sludge obtained in step A at the ratio of 100 kg of sludge to 2 kg of hydrogen peroxide, and then stir for 20 minutes;

[0025] C. Add ammonia water with an ammonia content of 20% to the sludge obtained in step B according to the ratio of 100 kg of sludge to 1.63 kg of ammonia water, adjust the pH of the sludge water to 5-6.5, and then stir for 20 minutes; finally use the sludge T...

Example Embodiment

[0027] Example 3

[0028] The invention provides a method for deep dehydration of sludge after treatment of domestic sewage, which comprises the following steps:

[0029] Source of raw mud: Huairou Sewage Treatment Plant, the PH value of raw mud is 7;

[0030] A. Dilute the preliminary dewatered sludge from domestic water with a water content of 80% or more with water to a water content of 94%, and add a water content of 99.5% pure sulphurous sulfate 7 at the ratio of adding 5.5 kg of ferrous sulfate to 100 kg of sludge. Iron or ferrous sulfate 6-hydrate, then stir for 13 minutes;

[0031] B. Add 30% hydrogen peroxide to the sludge obtained in step A at the ratio of 100 kg of sludge to 2 kg of hydrogen peroxide, and then stir for 15 minutes;

[0032] C. To the sludge obtained in step B, add ammonia water with an ammonia content of 20% at the ratio of 100 kg sludge to 1.65 kg ammonia water, adjust the pH of the sludge water to 5-6.5, and then stir for 15 minutes; finally use the sludge ...

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Abstract

The invention relates to a deep dehydration method of sludge after domestic sewage treatment, which comprises the following steps: A. diluting primary dehydrated sludge with the water content of 80% above from domestic water until the water content is 94%, adding 4.5-6 kilograms of ferrous sulfate into every 100 kilograms of sludge, and stirring for 10-15 minutes; B. adding 1.8-2.2 kilograms of oxydol into every 100 kilograms of sludge obtained in the step A, and stirring for 10-20 minutes; C. adding 1.6-1.7 kilograms of ammonia water into every 100 kilograms of sludge obtained in the step B to obtain the sludge water with the pH value of 5-6.5, and stirring for 10-20 minutes; and finally, carrying out extrusion dehydration on the sludge by using a sludge dehydration device. No solid matter is added, thereby avoiding increasing too much final solid sludge; and the treated sludge cake and leachate have moderate pH value and do not contain chlorine, thereby being beneficial to subsequent treatment.

Description

technical field [0001] The invention relates to sludge treatment, in particular to a method for deep dehydration of sludge after domestic sewage treatment. Background technique [0002] In order to dehydrate the domestic wastewater sludge to a water content below 60%, the existing technology is to add 5-7 kg of ferric chloride to 100 kg of sludge from the sewage treatment plant with a water content of more than 80%. and 10-15 kg of lime, and then stir evenly; use the sludge dewatering device to squeeze and dehydrate the sludge, so that the sludge can be dehydrated to a moisture content of less than 60%. However, due to the need to add iron trichloride in the implementation of the above-mentioned process, the mud cake after extrusion dehydration just contains the composition of chlorine, and in the follow-up mud cake disposal (burning) can produce chloride composition, causing serious damage to the environment pollute. In addition, the processed filtrate also causes difficu...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 尹秋利尹爱胜
Owner 北京同创碧源水务科技发展有限公司
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