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Alkali-ultrasonic synergistic wastewater treatment method and device

A sewage treatment, ultrasonic technology, applied in the direction of water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of unsatisfactory sludge cracking effect, improve efficiency, increase organic matter concentration, The effect of improving the denitrification effect

Inactive Publication Date: 2015-07-22
TIANJIN UNIV
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Problems solved by technology

[0003] At present, a simple method of sludge pretreatment has been widely studied. The simple addition of alkali to the sludge for alkaline hydrolysis has a certain effect on the cracking of the sludge, and the simple ultrasonic treatment can also achieve a certain cracking of the sludge. However, the sludge cracking effect of simple treatment is not ideal, and alkaline hydrolysis plus ultrasonic has a synergistic effect on sludge cracking, which can greatly improve the cracking effect. In view of this, the present invention proposes a combined method of alkaline hydrolysis and ultrasonic to prevent Treat the sludge and return the treated sludge to the biological treatment unit to increase the carbon source of the biological treatment unit, because in the biological denitrification system, the denitrifying bacteria can use the carbon source as the electron donor, NO 3 - and NO 2- As an electron acceptor, the NO 3- and NO 2- Reduction to nitrogen, while achieving the effect of removing organic matter

Method used

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Embodiment 1

[0024] Such as figure 1 and figure 2 The sewage treatment method and device shown in the device, after the mud-water mixture at the outlet of the aerobic biological treatment unit (1) is treated by the sedimentation separation unit (2), the supernatant is discharged from the system, and the concentration of the sediment is 5046mg / L sludge Add NaOH lye (3) to adjust the pH value to 10, then put it into the ultrasonic reaction vessel (5) and adjust the frequency to 28kHz, the sound energy density is 4W / mL, and the duty cycle is 50% to carry out ultrasonic processing unit (4) The action time of the treatment is 25 minutes. After the treatment, the disintegration rate of the sludge reaches 45.4%, and the dissolved SCOD of the sludge supernatant per unit time reaches 980mg / L. The treated sludge is returned to the inlet of the biological treatment unit, which increases the concentration of organic matter in the biological treatment unit, which solves the problem of insufficient ca...

Embodiment 2

[0026] Such as figure 1 and figure 2 The sewage treatment method and device shown in the device, after the mud-water mixture at the outlet of the anoxic biological treatment unit (1) is treated by the sedimentation separation unit (2), the supernatant is discharged from the system, and the concentration of the sediment is 8016mg / L sludge Add NaOH lye (3) to adjust the pH value to 11, then put it into the ultrasonic reaction vessel (5) and adjust the frequency to 25kHz, the sound energy density is 8W / mL, and the duty cycle is 50% to carry out ultrasonic processing unit (4) Treatment, the action time is 20 minutes, the sludge cracking rate after treatment reaches 38.6%, and the SCOD dissolved in the sludge supernatant per unit time reaches 3980mg / L. The treated sludge is returned to the inlet of the anoxic biological treatment unit, and the organic matter decomposed from the sludge provides nutrients for the microorganisms in the anoxic biological treatment unit, solving the p...

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Abstract

The invention relates to an alkali-ultrasonic synergistic wastewater treatment method and device. The alkali-ultrasonic synergistic wastewater treatment method comprises the following steps: precipitating and separating a mud-water mixture taken out of the outlet end of an aerobic biological treatment unit or an anoxic biological treatment unit, adding an alkali liquor into the separated sludge to regulate the pH value, and performing ultrasonic treatment; returning the sludge which is added with the alkali liquor and treated by ultrasonic to a wastewater biological treatment unit; adding an NaOH alkali liquor into the precipitated sludge to regulate the pH value to 10, and treating the sludge in an ultrasonic reactor, wherein the ultrasonic reactor is controlled to be 20 kHz in frequency, 8 W / mL in sound energy density and 50% in duty ratio of 50%, and under the condition that the ultrasonic treatment time is 30 min, floc destruction and cell cracking are performed on the sludge so as to release organic matters in floc cells of the sludge; returning the treated sludge to the biological treatment unit so as to increase the concentration of the organic matters in the biological treatment unit. Therefore, the problem that the biological treatment unit is short of a carbon source is solved.

Description

technical field [0001] The invention relates to a method and a device for treating sludge by adding alkali and ultrasonic wave and putting it into a biological treatment unit to increase the carbon source of biological treatment and improve the effect of biological treatment, belonging to the field of sewage treatment. In particular, it relates to a method and device for purifying domestic sewage. Background technique [0002] Due to the accelerated pace of urbanization in my country, the number of sewage plants has been increasing, and the output of residual sludge, a by-product of sewage treatment, has also been increasing, and the anaerobic treatment of residual sludge has become more and more the focus. The common problem of insufficient carbon sources in sewage plants is often solved by adding external carbon sources, which will undoubtedly increase the additional operating costs of sewage plants. In order to solve the above problems, the resource utilization of excess ...

Claims

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Application Information

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IPC IPC(8): C02F11/00
Inventor 张书廷李倩王晶晶
Owner TIANJIN UNIV
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