Ultrasonic sludge reduction anaerobic treatment system

Abstract

This invention provides an ultrasonic anaerobic treatment system for sludge reduction, including a primary sedimentation tank, an aeration tank, and a solid-liquid separation device. The three are connected by a circulation pipeline and a reversing valve to select whether the separated sludge is returned or mixed with the primary sedimentation sludge for output. At least one ultrasonic oscillator is installed in the mixed sludge output pipeline. Through high-frequency vibration and cavitation effect excited by piezoelectric ceramic plates, the sludge is disintegrated and then transported to the anaerobic digester, which releases particulate organic matter and increases dissolved chemical oxygen demand, enhances hydrolysis, acid production, and methanogenesis, and achieves the effects of sludge reduction and increased biogas production, while improving system stability and energy utilization efficiency.

Claims

1. An anaerobic treatment system for ultrasonic sludge reduction, comprising: A primary sedimentation tank for separating raw water to form primary sedimented wastewater and primary sedimented sludge for output; an aeration tank connected to the primary sedimentation tank to receive and aerate the primary sedimented wastewater, and the aeration tank outputs aerated wastewater; a solid-liquid separation device connected to the aeration tank to receive and separate the aerated wastewater, and the solid-liquid separation device outputs treated effluent and separated sludge; a first circulation pipeline is also provided between the solid-liquid separation device and the aeration tank, and a reversing valve is provided on the first circulation pipeline, the reversing valve having a first flow direction and a second flow direction; in the first flow direction, the separated sludge is guided to circulate to the aeration tank for treatment; in the second flow direction, the separated sludge is guided to mix with the primary sedimented sludge to form a mixed sludge for output; At least one ultrasonic oscillator is installed on the output pipeline of the mixed sludge. The ultrasonic oscillator is used to receive and ultrasonically process the mixed sludge to form an ultrasonically processed sludge output. An anaerobic digester is connected to the output pipeline of the ultrasonically processed sludge. The anaerobic digester is used to receive and anaerobically digest the ultrasonically processed sludge to form biogas and an anaerobic sludge output.

2. The anaerobic treatment system for ultrasonic sludge reduction as described in claim 1, wherein, An upflow anaerobic sludge bed reactor is also provided between the primary sedimentation tank and the aeration tank. The primary sedimentation wastewater flows through the upflow anaerobic sludge bed reactor to separate into biogas and reactive wastewater. The reactive wastewater is then transported to the aeration tank for aeration treatment to form the aerated wastewater.

3. The anaerobic treatment system for ultrasonic sludge reduction as described in claim 1 or 2, wherein, The aeration tank is also equipped with an independent return pipeline; the anaerobic treatment system includes two sets of ultrasonic vibrators, namely a first ultrasonic vibrator installed on the output pipeline of the mixed sludge and a second ultrasonic vibrator installed on the independent return pipeline. The second ultrasonic vibrator and the independent return pipeline are used to circulate and ultrasonically treat the aerated wastewater in the aeration tank.

4. The anaerobic treatment system for ultrasonic sludge reduction as described in claim 3, wherein, The anaerobic treatment system also includes three sets of ultrasonic vibrators. These three sets of ultrasonic vibrators are a third ultrasonic vibrator located on the first circulation pipeline and between the reversing valve and the aeration tank, a fourth ultrasonic vibrator located on the output pipeline of the primary sludge, and a fifth ultrasonic vibrator located on the output pipeline of the second flow direction of the reversing valve. The separated sludge is ultrasonically treated and then returned to the aeration tank along the first circulation pipeline. Alternatively, the primary sludge and the separated sludge are ultrasonically treated separately and then mixed to form the mixed sludge, which is then output to the first ultrasonic vibrator.

5. The anaerobic treatment system for ultrasonic sludge reduction as described in claim 4, wherein, A second circulation pipeline is provided between the output pipeline of the ultrasonically treated sludge and the output pipeline of the anaerobic sludge. The second circulation pipeline is equipped with another reversing valve and a sixth ultrasonic oscillator. The other reversing valve has a third flow direction and a fourth flow direction. In the third flow direction, the anaerobic sludge is guided to circulate to the sixth ultrasonic oscillator for treatment, and then merges with the ultrasonically treated sludge and is transported to the anaerobic digester. In the fourth flow direction, the anaerobic sludge is guided to be output.

6. The anaerobic treatment system for ultrasonic sludge reduction as described in claim 1, wherein when the sludge concentration of the separated sludge is greater than a first preset concentration, the separated sludge is a high-concentration reflux separated sludge and is guided by the reversing valve to the circulation pipeline for circulation to the aeration tank; when the sludge concentration of the separated sludge is less than or equal to the first preset concentration, the separated sludge is a high-concentration separated sludge and is guided by the reversing valve to mix with the primary sludge to form the mixed sludge output.

7. The anaerobic treatment system for ultrasonic sludge reduction as described in claim 5, wherein when the sludge concentration of the anaerobic sludge is greater than a second preset concentration, the anaerobic sludge is a high-concentration anaerobic sludge and is guided to the output pipeline of the ultrasonically treated sludge by the other reversing valve; and when the sludge concentration of the anaerobic sludge is less than or equal to the second preset concentration, the anaerobic sludge is a low-concentration anaerobic sludge and is output by the other reversing valve.

8. The anaerobic treatment system for ultrasonic sludge reduction as described in claim 1, wherein, The solid-liquid separation equipment consists of a secondary sedimentation tank or a thin-film bioreactor.

9. The anaerobic treatment system for ultrasonic sludge reduction as described in claim 1, wherein, The ultrasonic oscillator includes a transducer, at least one piezoelectric ceramic plate, an amplifier, and an amplitude transformer, and is provided with two wires that are electrically connected to the two electrodes of the transducer respectively; wherein, the ultrasonic vibration generated by the piezoelectric ceramic plate under driving is sequentially coupled and output through the amplifier and the amplitude transformer to be transmitted to the sludge stream to be treated in the anaerobic treatment system.

10. The anaerobic treatment system for ultrasonic sludge reduction as described in claim 9, wherein, The transducer is a structure that coaxially holds the piezoelectric ceramic sheet, which is stacked and connected to the two wires by their respective polarities.

11. The anaerobic treatment system for ultrasonic sludge reduction as described in claim 9 or 10, wherein, The amplifier is positioned between the transducer and the amplitude transformer and is used to amplify the displacement amplitude and adjust the mechanical impedance, thereby increasing the ultrasonic energy supplied to the amplitude transformer.

12. The anaerobic treatment system for ultrasonic sludge reduction as described in claim 9, wherein, An annular groove is provided between the amplifier and the amplitude transformer of the ultrasonic oscillator. The annular groove is formed around the axis of the ultrasonic oscillator and is located at the connection neck between the amplifier and the amplitude transformer. It is used to adjust the resonance mode so that the displacement node is aligned with the flange plane of the amplifier, thereby serving as a clamping and fixing position to reduce the damping and energy loss of the ultrasonic amplitude during clamping.

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