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Excess sludge wall-breaking and cell-dissolving method and device

A technology for excess sludge and cell lysis, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of excess sludge rise, unfavorable sludge aerobic treatment or anaerobic digestion , can not be industrialized and other issues

Inactive Publication Date: 2011-06-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of ultrasonic and alkali synergistically breaking the excess sludge, if a relatively high lysis rate is required, a large amount of sodium hydroxide and a long ultrasonic treatment time must be added, so that the pH of the excess sludge will easily increase, which is not conducive to Aerobic treatment or anaerobic digestion of sludge has high treatment costs and cannot be promoted industrially

Method used

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  • Excess sludge wall-breaking and cell-dissolving method and device
  • Excess sludge wall-breaking and cell-dissolving method and device
  • Excess sludge wall-breaking and cell-dissolving method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The structure of the trough ultrasonic equipment is attached figure 1 shown. The groove type ultrasonic frequency is 20kHz, the power is 100W, there is one transducer, the diameter of the transducer is 68mm, the length of the sound field in the groove is 0.15m, and the width is 0.15m. Take the residual sludge of a sewage plant in Tianjin as an example. The remaining sludge in the gravity concentration tank 1 is pumped into the mixing tank 3 through the sludge pump 2, and then the chemical reagents in the sodium hydroxide solution tank 4 and the Tween solution tank 5 are added to the mixing tank through the peristaltic pump 6, and in the process of mechanical stirring 7 The sludge is fully mixed under the action, and then the sludge is pumped into the trough equipment 8 by the sludge pump 2, and enters the feed hopper 10 through the trough ultrasonic inlet 9, and the sludge pressure, gravity and fluid distributor 11 in the feed hopper Under the combined action, throug...

Embodiment 2

[0030] Operation process is identical with embodiment 1. The difference is that the ultrasonic frequency is 25kHz, and other conditions are shown in Table 2. The wavelength is 60mm (half wavelength is 30mm)), and the "near field" distance is 19.3mm. The lysis efficiency under different conditions is shown in Table 2.

[0031] Table 2 Lysis rate and cost under different conditions

[0032]

Embodiment 3

[0034] Operation process is identical with embodiment 1. The difference is that the frequency is 28kHz, see Table 2 for other conditions. The wavelength is 54mm (half wavelength is 27mm), and the "near field" distance is 21.4mm. The lysis efficiency under different conditions is shown in Table 3.

[0035] Table 1 Lysis rate and cost under different conditions

[0036]

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Abstract

The invention relates to an excess sludge wall-breaking and cell-dissolving method and device. Ultrasonic wave and various chemical agents are used commonly for wall breaking and cell dissolving and the method is as follows: sodium hydroxide and Tween 80 are added in excess sludge to be treated to perform ultrasonic treatment; the concentration of sodium hydroxide is 0.80-1.20kg.m<-3>, the concentration of Tween 80 is 1.0-1.5 kg.m<-3>, the ultrasonic effective treatment time is 3.0s-30s and the frequency of sound wave is 20kHz-28kHz; a tank ultrasonic cleaning machine is adopted, and the ultrasonic device is arranged in an inclined manner; and excess sludge is pumped by a sludge pump from the upper end of the tank ultrasonic cleaning machine, excess sludge enters through a feed hopper, flows through the ultrasonic device under the action of the gravity, passes through a plate mesh fluid distributor, flows out of a lower discharge hole naturally and enters a subsequent sludge digestion system or sludge aerobic treatment system. By adopting the thin-layer and short-time ultrasonic treatment with high energy density, the wall-breaking and cell-dissolving rate and efficiency of sludge can be increased and the equipment cost can be saved; and the effective retention time of excess sludge in the ultrasonic sound field is shorter, thus the daily treatment scale of the ultrasonic device can be increased.

Description

technical field [0001] The invention relates to a method for reducing a large amount of excess sludge produced in the biological treatment process of urban sewage and a corresponding operating device thereof, belonging to the sludge treatment technology in the field of sewage treatment and solid waste treatment. Background technique [0002] With the development of social economy and the acceleration of urbanization, the amount of urban sewage and its sludge has increased rapidly. The annual production of wet sludge in my country has reached 12 million tons, with an annual growth rate of 10-15%. Because the cost of sludge treatment accounts for about 50% of the treatment cost of sewage treatment plants, the cost is very high, so many sewage treatment plants in my country often only treat sewage and avoid sludge treatment, mainly landfill and stack, causing serious pollution Environmental Pollution. Therefore, it is imperative to carry out scientific and reasonable treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 刘勇秦晓
Owner TIANJIN UNIV
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