Unlock instant, AI-driven research and patent intelligence for your innovation.

Box type device and process for pretreatment of sludge by virtue of ultrasonic coupling alkaline hydrolysis

A pretreatment device, ultrasonic technology, applied in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc. The effect of sludge digestion efficiency, high radiation uniformity and low operating cost

Inactive Publication Date: 2017-04-26
TIANJIN UNIV
View PDF7 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that the traditional ultrasonic sludge cracking equipment has small processing capacity, low uniformity of acoustic radiation, inability to process continuously, high energy consumption, immature pretreatment process, and cannot be adapted to industrial-scale production and application.

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
  • Box type device and process for pretreatment of sludge by virtue of ultrasonic coupling alkaline hydrolysis
  • Box type device and process for pretreatment of sludge by virtue of ultrasonic coupling alkaline hydrolysis
  • Box type device and process for pretreatment of sludge by virtue of ultrasonic coupling alkaline hydrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Decompose pretreatment of the remaining sludge in a sewage treatment plant. The plant adopts the A / O activated sludge treatment process with a treatment capacity of 260,000m 3 / d, of which 60% is domestic sewage and 40% is industrial wastewater. The sludge is pretreated by the equipment of the present invention, the processing power is 3.2kW, the frequency is 20kHz, and the residence time is 10min. Under the conditions of high sludge gas production rate and organic matter removal rate, ultrasonic pretreatment can shorten the sludge residence time of anaerobic digestion reaction from 20d to 8d. When the sludge residence time of pretreated sludge is 8d , its hydrolysis rate, acid production rate and methane production rate increased by 82.38%, 76.47% and 86.54% respectively compared with 20d. Compared with the control group, the biogas production of pretreated cracked sludge increased by 68%.

Embodiment 2

[0039] The dewatering sludge of a municipal sewage treatment plant is cracked and pretreated. The plant uses A 2 / O activated sludge treatment process with a treatment capacity of 200,000m 3 / d, the moisture content of the sludge is 80%-82%, and the sludge is diluted to a moisture content of 96% during treatment. The diluted sludge is pretreated by this process. The ultrasonic treatment power is 5kW, the frequency is 20kHz, and the residence time is 15min. The amount of alkali is 0.01g / g TS CaO. Sludge SCOD concentration increased by 100% compared with the control group, anaerobic digestion was performed on the treated sludge, anaerobic digestion reaction was performed on the sludge after cracking, and the gas production after pretreatment and cracking increased by 94% compared with the control group.

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 discloses a box type device for pretreatment of sludge by virtue of ultrasonic coupling alkaline hydrolysis. The device consists of a raw sludge storage tank system, an alkali adding stirring system, an ultrasonic reactor system, a treated sludge storage tank system and a connecting pipeline, wherein an ultrasonic reactor comprises a sludge reaction box body, two disintegration tanks arranged up and down are included in the sludge reaction box body, a sludge inlet pipe is arranged at the bottom of the lower disintegration tank and is connected with an outlet of a sludge inlet screw pump, and a liquid level gauge is arranged in the upper disintegration tank; and during sludge disintegration, the sludge is subjected to a plug flow rotary type reaction in the two disintegration tanks arranged up and down in the sludge reaction box body, the sludge is conveyed into the alkali adding stirring system through the raw sludge storage tank system, then the sludge enters the ultrasonic reactor system after alkali adding and is subjected to ultrasonic disintegration, the disintegration time is 5-30min, and the disintegrated sludge enters a treated sludge storage tank to be subjected to a pretreatment reaction. The device disclosed by the invention has the characteristics of low power density, relatively large treating capacity, relatively good treatment effect, uniform sludge treatment, continuous running and adjustable power.

Description

technical field [0001] The invention relates to a sludge treatment system, in particular to an ultrasonic coupling alkaline hydrolysis sludge pretreatment device and process. Background technique [0002] At present, most municipal sewage treatment plants use the activated sludge method to treat sewage. This process produces a large amount of sludge. The sludge contains a large number of complex substances such as microorganisms, organic debris, and inorganic particles. If it is not treated properly, it will bring serious damage to the environment. pollution. Sludge treatment methods include anaerobic digestion, aerobic digestion, and sludge composting, among which anaerobic digestion is the most commonly used, but due to the presence of refractory substances in the sludge, the digestion residence time is longer. [0003] Ultrasonic coupling alkaline hydrolysis pretreatment sludge technology can break the refractory and stable microbial cell wall in the sludge, so that the ...

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): C02F11/00C02F11/04
CPCC02F11/00C02F11/04
Inventor 季民张博
Owner TIANJIN UNIV