Method for adjusting and treating municipal residual sludge by using salinferous brine or seawater

A technology for excess sludge and salt brine, applied in the field of environmental engineering, can solve the problems of reduction, high disposal cost, high price, etc., and achieve the effects of simple process, saving chemical raw materials, and convenient and feasible operation.

Inactive Publication Date: 2010-09-08
SHANGHAI UNIV
View PDF0 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of the cost of sludge disposal, the infrastructure cost of sludge treatment and disposal accounts for about 24% to 35% of the total infrastructure cost of the sewage plant, and the disposal cost accounts for about 20% to 50% of the operation cost of the whole plant, which is expensive.
[0003] However, in terms of sludge dehydration treatment, PAM (polyacrylamide) flocculant is generally used in China to treat sludge, so that the water content is reduced to about 80% before treatment. Due to the high price of PAM, sludge The treatment makes some small sewage plants unbearable

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
  • Method for adjusting and treating municipal residual sludge by using salinferous brine or seawater
  • Method for adjusting and treating municipal residual sludge by using salinferous brine or seawater
  • Method for adjusting and treating municipal residual sludge by using salinferous brine or seawater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Take the residual sludge of the municipal sewage plant as the test object, its initial water content is 99.5%, after it is left to settle for a period of time, the supernatant is removed, and now the water content is 98%. Take 500ml of the sludge and place it in a 2000ml beaker, then add 1000ml of brine or seawater, stir for 15 minutes; let it settle for 15 minutes, then remove the supernatant; then put the remaining sludge floc water in a centrifuge tube Centrifuge at 4000rpm for 10 minutes, then remove the supernatant, and the average moisture content of the sludge flocs left at the end is 79.3%, which basically meets the municipal treatment requirements of reducing the moisture content to 80% before sludge disposal. Direct landfill or other treatment.

[0018] The brine or seawater used in this embodiment has the concentration of salt ions as shown in Table 1 below.

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 method for adjusting and treating municipal residual sludge by using salinferous brine or seawater, belonging to the technical field of environment engineering. The essential of the method is that a certain amount of salinferous brine or high-salinity seawater is added into the sludge with the moisture content of 99 percent; the volume ratio of the sludge and the high-salinity brine or seawater as a conditioner is 1:1-1:2; the moisture content of the sludge is reduced in free water and in the form changing process of the sludge floc, thereby the pretreatment requirement before the sludge is treated is met, and the requirement that the moisture content of the municipal sludge after pretreatment is 80 percent is satisfied; and then the pretreated sludge can be treated in other approaches such as landfill, burning or agricultural use and the like. The invention has simple process as well as convenient and feasible operation.

Description

technical field [0001] The invention relates to a method for regulating and treating municipal surplus sludge with salt-producing brine or seawater, and belongs to the technical field of environmental engineering. Background technique [0002] With the development and progress of the society, people's awareness of the protection and improvement of the living environment has been continuously enhanced, and the national environmental protection laws and regulations have been continuously improved, and the sewage treatment volume and treatment rate have been greatly improved nationwide. However, as a by-product of sewage treatment, the generation of sludge accounts for about 0.3% to 0.5% of the sewage treatment volume. If the sludge is further treated, the sludge production will continue to increase by 0.5 to 1 times. At present, the annual output of sludge from urban sewage plants in my country is about 800,000 to 1,400,000 tons (calculated with a moisture content of about 97%...

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 Applications(China)
IPC IPC(8): C02F11/14
Inventor 钱光人邓涛李传华刘芳芳周英梅
Owner SHANGHAI UNIV
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