Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, because the alkalinity of the filtrate after treatment is seriously over the standard, it also causes difficulties for subsequent treatment.
In addition, due to the need to add a large amount of solid matter, the amount of solid matter added is 50%-60% of the dry matter of the sludge, resulting in an increase in the final amount of solid sludge

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0015] Raw mud source: Beixiaohe Sewage Treatment Plant, raw mud PH value is 6.5;

[0016] A. Dilute the preliminary dewatered sludge from domestic water with a water content of more than 80% to a water content of 94%, and add 7-hydration sulfuric acid with a purity of 99.5% according to the ratio of adding 4.5 kg of ferrous sulfate to 100 kg of sludge Iron or ferrous sulfate hexahydrate, then stirred for 10 minutes;

[0017] B. in the sludge that step A obtains, add the hydrogen peroxide that concentration is 30% according to the ratio that 100 kilograms of sludges add 1.8 kilograms of hydrogen peroxides, then stir 10 minutes;

[0018] C. in the sludge that step B obtains, add the ammoniacal liquor that ammonia content is 20% according to the ratio of adding 1.6 kilograms of ammoniacal liquors according to 100 kilograms of sludges, adjust t...

Embodiment 2

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

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

[0023] A. Dilute the preliminary dewatered sludge from domestic water with a water content of more than 80% to a water content of 94%, and add 7-hydration sulfuric acid with a purity of 99.5% according to the ratio of adding 5 kg of ferrous sulfate to 100 kg of sludge Iron or ferrous sulfate hexahydrate, then stirred for 15 minutes;

[0024] B. in the sludge that step A obtains, add the hydrogen peroxide that concentration is 30% according to the ratio of adding 2 kilograms of hydrogen peroxides to 100 kilograms of sludges, then stir 20 minutes;

[0025] C. in the sludge that step B obtains, add the ammoniacal liquor that ammonia content is 20% according to the ratio of adding 1.63 kilograms of ammoniacal liquors according to 100 kilograms of sludges, adjust th...

Embodiment 3

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

[0029] Raw mud source: Huairou Sewage Treatment Plant, raw mud PH value is 7;

[0030] A. Dilute the preliminary dewatered sludge from domestic water with a moisture content of more than 80% to a moisture content of 94%, and add 7-hydration sulfuric acid with a purity of 99.5% according to the ratio of adding 5.5 kg of ferrous sulfate to 100 kg of sludge Iron or ferrous sulfate hexahydrate, then stirred for 13 minutes;

[0031] B. adding concentration to the sludge obtained in step A according to the ratio of adding 2 kilograms of hydrogen peroxide to 100 kilograms of sludge is 30% hydrogen peroxide, then stirred for 15 minutes;

[0032] C. in the sludge that step B obtains, add the ammoniacal liquor that ammonia content is 20% according to the ratio of adding 1.65 kilograms of ammoniacal liquors according to 100 kilograms of sludges, adjust...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com