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

Biological drying method of municipal dewatered sludge without auxiliary materials based on sodium hydroxide pretreatment

A technology of biological drying and sodium hydroxide, which is applied in biological sludge treatment, dewatering/drying/concentrating sludge treatment, etc., can solve the difficulty of sludge filling recovery, the rapid growth of unfavorable microorganisms, and the reduction of sludge pH value. and other problems, to achieve the effect of high-efficiency biological drying and reduction, conducive to rapid growth and reproduction, and reducing the content of pollutants

Active Publication Date: 2015-11-04
ENERGY RES INST OF SHANDONG ACAD OF SCI
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can partially solve the problems of difficult hydrolysis of sludge in the early stage and slow start-up of fermentation, but there are problems such as difficult recovery of sludge fillings and unfavorable for large-scale promotion; and the addition of acid will lead to sludge to a certain extent. The pH value is lowered, which is not conducive to the rapid growth of microorganisms
[0006] The current method for sludge biological drying is to achieve rapid drying by increasing the treatment temperature and ventilation rate on the basis of adding auxiliary materials (straw, fly ash, etc.), without releasing the sludge cell content and microbial activity. Comprehensive consideration from the perspective of the final effect of sludge reduction

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

[0038] The method of biological drying of municipal dewatered sludge based on sodium hydroxide pretreatment without auxiliary materials consists of the following steps: (1) The initial water content of municipal dewatered sludge is 80%, take 50 kg of sludge, add 100 grams of sodium hydroxide, After 2 days of treatment at 40°C, the soluble protein content in the sludge increased from 508 μg / g dry weight to 2380 μg / g dry weight, and the pH value after the treatment was 8.4, and an alkaline sludge matrix was obtained.

[0039] (2) Preparation of sludge biological drying matrix: Dry a part of the alkaline sludge matrix obtained in step (1) to a water content of 5%, and obtain the dried sludge with step (1) to obtain the alkaline sludge matrix Mix and adjust the initial water content to 50% to obtain the sludge biological drying matrix.

[0040] (3) Preparation of sludge fermentation inoculum. Inoculate the alkali-resistant microbial agent Trichoderma aculeatus CGM-10 at 20°C ( T...

Embodiment 2

[0043] The method of biological drying of municipal dewatered sludge without auxiliary materials based on sodium hydroxide pretreatment consists of the following steps: (1) The initial water content of municipal dewatered sludge is 76%. Take 60 kg of sludge and 600 grams of sodium hydroxide in After treatment at 20°C for 4 days, the soluble protein content in the sludge increased from 580 μg / g dry weight to 13530 μg / g dry weight. After the treatment, the pH value of the sludge was 9.7, and an alkaline sludge matrix was obtained.

[0044] (2) Deployment of sludge biological drying matrix: dry a part of the alkaline sludge matrix through step (1) until the water content is 10%, add it to the alkaline sludge matrix obtained in step (1), and adjust the initial The water content is 65%, and the sludge biological drying matrix is ​​obtained.

[0045] (3) Preparation of sludge fermentation inoculum. Inoculate the alkali-resistant microbial agent Trichoderma aculeatus CGM-10 at 40°C ...

Embodiment 3

[0048] The municipal dewatered sludge biological drying method without auxiliary materials based on sodium hydroxide pretreatment consists of the following steps:

[0049] (1) The initial water content of municipal dewatered sludge is 70%. Take 40kg of sludge, add 320g of sodium hydroxide, and treat it at 30°C for 3 days. The content of soluble protein in the sludge increases from 480μg / g dry weight To 14580 μg / g dry weight, the pH value of the sludge after the treatment was 9.1, and the alkaline sludge matrix was obtained.

[0050] (2) Preparation of sludge biological drying matrix: Add the biologically dried dry sludge with a water content of 39% obtained in Example (2) to the alkaline sludge matrix obtained in step (1) to adjust the initial The water content is 60%, and the sludge biological drying matrix is ​​obtained.

[0051] (3) Preparation of sludge fermentation inoculum. Inoculate the alkali-resistant microbial agent Trichoderma aculeatus CGM-10 at 30°C ( Trichode...

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
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a municipal dewatered sludge accessory-free bio-drying method on the basis of sodium hydroxide pretreatment, belonging to the field of environment protection. Aiming at the problems that municipal dewatered sludge has high organic matter content, but nutrient components in the sludge are hard to be fully used, the municipal dewatered sludge is pretreated by using sodium hydroxide at first, and then is subjected to bio-drying. The municipal dewatered sludge accessory-free bio-drying method mainly comprises the steps of (1) sodium hydroxide pretreatment of the municipal dewatered sludge; (2) formulation of a sludge bio-drying matrix; (3) preparation of a sludge fermentation inoculum; (4) bio-drying of the municipal dewatered sludge under an alkaline condition. The rapid dewatering and stabilization of the municipal sludge can be realized through the steps.

Description

technical field [0001] The invention relates to municipal sludge drying technology, in particular to a method for biological drying of municipal dewatered sludge based on sodium hydroxide pretreatment without auxiliary materials. Background technique [0002] In recent years, with the acceleration of urbanization in our country, the construction speed of sewage treatment facilities has also been greatly increased, and the output of sludge has also increased. According to statistics, by the end of 2009, there were more than 3,000 urban sewage treatment plants in my country, and the output of sludge (with a water content of 80%) had exceeded 20 million tons in that year, and it was in a stage of rapid growth. The form of sludge treatment and disposal has become extremely severe. At present, there are four main methods of sludge treatment and disposal: landfill, incineration, throwing into the sea, and composting. Among them, landfill is the main method. However, due to the lac...

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): C02F11/02C02F11/12
Inventor 梁晓辉赵玉晓张晓东华栋梁张杰司洪宇李岩许海朋牧辉
Owner ENERGY RES INST OF SHANDONG 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