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

A method for treating sludge with biocide coupled with quicklime

A biocide and quicklime technology, applied in sludge treatment, special treatment targets, chemical instruments and methods, etc., can solve the problems of large sludge volume, difficult sludge dewatering, inability to meet the requirements of sludge treatment, etc. The effect of sludge secondary pollution, improving sludge dewatering rate and preventing sludge from clogging filter cloth

Active Publication Date: 2017-03-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong hydrophilicity of the bacteria colloidal polymer of the sludge, it is difficult to dewater the sludge. After conventional dehydration, the sludge is bulky, which brings great difficulties to the transportation of the sludge from the factory.
[0004] At present, the mechanical dehydration method used by domestic sewage treatment plants can only reduce the moisture content of sludge to about 80wt.%, which cannot meet the requirements of subsequent sludge treatment.

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

[0022] 1. Add the biocide isothiazolinone to the dewatered sludge (water content 80wt.%) of the urban sewage plant, and the addition amount is 0.4wt.% of the dry weight of the sludge;

[0023] ② Add quicklime powder to the above sludge and stir evenly. The amount of quicklime added is 8% of the dry weight of the sludge base. React the sludge with the biocide and quicklime for 1 hour to obtain press-filtered sludge;

[0024] ③ Wrap the press filter sludge with double-layer filter cloth, the inner layer is 90-mesh nylon filter cloth, and the outer layer is polyester filter cloth;

[0025] ④Put a filter bag wrapped in sludge into the filter press cylinder, use the filter press assembled with AEEF-AC three-phase motor and ZK HP MODELMOB50×300 hydraulic cylinder to press filter, the pressure is 0.4Mpa, and the filter press time is 1.5 h.

[0026] ⑤ After drying at 105°C to constant weight, the moisture content of the sludge was measured to be 56.3wt.%, and the calorific value was ...

Embodiment 2

[0028] 1. Add the biocide isothiazolinone to the river bottom mud (water content 60wt.%), and the addition amount is 0.4wt.% of the dry weight of the sludge base;

[0029] ② Add quicklime powder to the above sludge and stir evenly. The amount of quicklime added is 8% of the dry weight of the sludge base. React the sludge with the biocide and quicklime for 1 hour to obtain press-filtered sludge;

[0030] ③The filter press treatment sludge is wrapped with double-layer filter cloth, the inner layer is 80-mesh nylon filter cloth, and the outer layer is polyester filter cloth; it is used as a filter bag;

[0031] ④Put a filter bag wrapped in sludge into the filter press cylinder, use the filter press assembled with AEEF-AC three-phase motor and ZK HP MODELMOB50×300 hydraulic cylinder to press filter, the pressure is 0.4Mpa, and the filter press time is 1.5 h.

[0032] ⑤After drying at 105°C to constant weight, the moisture content of the sludge was measured to be 40.1wt.%, and the...

Embodiment 3

[0034] ①Add the biocide isothiazolinone to the dewatered sludge (water content 75wt.%) of the urban sewage plant, and the addition amount is 0.6% of the dry weight of the sludge base;

[0035] ② Add quicklime powder to the above sludge and stir evenly. The amount of quicklime added is 12% of the dry weight of the sludge base. React the sludge with the biocide and quicklime for 2 hours to obtain press-filtered sludge;

[0036] ③ Wrap the press filter sludge with double-layer filter cloth, the inner layer is 100-mesh nylon filter cloth, and the outer layer is polyester filter cloth;

[0037] ④Put 3 filter bags wrapped in sludge into the filter press cylinder, and filter with the filter press assembled with AEEF-AC three-phase motor and ZK HP MODELMOB50×300 hydraulic cylinder. The pressure per unit area of ​​the mud cake is 0.4Mpa. Filtration time is 1h.

[0038] ⑤After drying at 105°C to constant weight, the moisture content of the sludge was measured to be 55.5wt.%, and the ca...

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

PropertyMeasurementUnit
heating valueaaaaaaaaaa
heating valueaaaaaaaaaa
heating valueaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for treating sludge with biocide coupled with quicklime, which belongs to the technical field of sludge treatment. Sludge contains a large number of microbial flocs. By adding biocide and quicklime to destroy the structure of bacterial micelles, the internal water is released, and the purpose of deep dehydration of sludge can be achieved by using filter press technology. The water content of the mud cake after treatment by this method is 40-60wt.%, which meets the requirements for subsequent treatment of sludge.

Description

technical field [0001] The invention relates to pretreatment of biochemical sludge with biocide and quicklime, and adopts filter press dewatering technology to realize deep dehydration of sludge, belonging to the technical field of sludge treatment. Background technique [0002] In recent years, with the continuous improvement of my country's urban sewage treatment rate, the surplus sludge output of urban sewage treatment plants has increased sharply, and more than 30 million tons of sludge with a moisture content of about 80wt.% are produced every year. At present, the total effective treatment and disposal rate of sludge in my country is only 5% to 10%, and most of the rest have not undergone standardized treatment and disposal. Common sludge treatment methods mainly include sanitary landfill, land use, thermal drying and incineration. These treatment methods have certain requirements on the moisture content of sludge. The lower the moisture content, the lower the cost of...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/14
CPCC02F11/122C02F11/14C02F2303/04
Inventor 孙承林于杨蒋文天卫皇曌余丽刘培娟赵颖
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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