Self-heat-supply type sludge dewatering and drying method and system

A drying method and drying system technology, applied in water/sludge/sewage treatment, combustion method, sludge treatment, etc., can solve problems such as reducing the final volume, improve the depth of dehydration, reduce dosage, and reduce chloride ion content Effect

Pending Publication Date: 2018-04-03
HUNAN BAILIN BIOLOGICAL TECH
View PDF4 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies of the prior art, to provide a sludge dehydration drying method and system using dried sludge as a heat source, to improve the de...

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Self-heat-supply type sludge dewatering and drying method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] This embodiment is for treating sludge from a paper mill. The paper mill sludge is composed of primary sedimentation tank sludge, aerated secondary sedimentation tank sludge and deep decolorization treatment sludge. The comprehensive sludge concentration is 1.8~2.0wt.%. The average calorific value is 3200kcal / kg, and the average sludge production (equivalent to 100%) is 25 tons / day.

[0070] In this example, sodium polyaluminosilicate, polyaluminum chloride, and cationic polyacrylamide are used as flocculants, which are respectively added to three static mixers connected in series on the sludge pipeline, and mixed with sludge to produce flocculation reaction, polysilicon The added mass of sodium aluminate, polyaluminum chloride and cationic polyacrylamide is 2.5wt.%, 3wt.% and 0.35wt.% of the absolute dry sludge, respectively, and the flocculated sludge fully mixed with the agent is introduced into the sludge The dehydration tower 6 dehydrates, and the sewage overflowi...

Embodiment 2

[0073] This embodiment is used to treat a certain municipal domestic sewage sludge. The sludge of this plant is mainly composed of activated sludge from the aerated secondary sedimentation tank and deep decolorization treatment sludge. kg, the average amount of sludge (equivalent to 100%) is 45 tons / day. Add 30% sodium aluminosilicate, 10% polyaluminum chloride and 0.2% cationic polyacrylamide solution to the three static mixers connected in series on the sludge pipeline, and mix with the sludge to produce flocculation In the reaction, the added mass of sodium aluminosilicate, polyaluminum chloride and cationic polyacrylamide were respectively 2.5 wt.%, 3 wt.% and 0.35 wt.% of the absolute dry sludge, and the The flocculated sludge is introduced into the sludge dehydration tower for dehydration, and the sewage overflowing from the upper part of the tower flows back to the sewage treatment system for retreatment. The powdery sludge conditioner is 6500kcal / kg, and the addition...

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 self-heat-supply type sludge dewatering and drying method and system. The dewatering and drying method comprises the following steps: firstly, adding a flocculation chemicalto to-be-treated sludge, and performing concentration and dewatering to obtain concentrated sludge; adding a sludge conditioner to the concentrated sludge, and stirring the sludge uniformly to obtainconditioned sludge; performing press filtration dewatering on the conditioned sludge to obtain a sludge filter cake; crushing and drying the sludge filter cake in high-temperature flue gas to obtaina dust and sludge mixture; conveying the dust and sludge mixture to a gas-solid separation device, and separating the sludge from the flue gas to obtain powdery sludge with water content being 15wt.%-20wt.%; feeding the sludge into a combustion heat supply mechanism after granulation, performing combustion to obtain high-temperature flue gas, cooling the high-temperature flue gas and conveying thehigh-temperature flue gas to a crushing and drying device. The method and the system are high in continuity and dewatering degree, the sludge treatment process is short, the operation cost is low, anexternally added heat source is not needed, so that energy cost is reduced greatly, and the sludge mass is further reduced by combustion.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to a sludge self-heating dehydration drying method and system. Background technique [0002] With the rapid development of my country's economy and urbanization, the problem of water pollution has become increasingly prominent, and the amount of sewage discharge has shown a trend of rapid increase. According to incomplete statistics, during the 14 years from 1990 to 2003, my country's urban sewage discharge increased by 10 billion m 3 , 46 billion m in 2003 3 ; In only 11 years from 2004 to 2014, my country's urban sewage discharge increased to 125 billion m 3 , an increase of 79 billion m 3 . By the end of 2014, the treatment capacity of urban domestic sewage facilities in my country reached 150 million m 3 / d, the sewage treatment rate reaches 80wt.%. With the advancement of energy saving and emission reduction goals in the "Twelfth Five-Year Plan", my country's s...

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): C02F11/12C02F11/14B01D53/84B01D53/48B01D53/58F23G7/00
CPCB01D53/007B01D53/48B01D53/58B01D53/84F23G7/001C02F11/122C02F11/14F23G2209/12B01D2259/804B01D2257/90Y02A50/20
Inventor 晏永祥王庆峰曹洲青李帮汉韩俊源
Owner HUNAN BAILIN BIOLOGICAL TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap