Ultrasonic sludge reduction aerobic treatment system

Abstract

This invention provides an ultrasonic sludge reduction aerobic treatment system, comprising a primary sedimentation tank, a biological treatment tank, and a sludge thickening tank. A circulation pipeline and reversing valve connect the three tanks to selectively guide the thickened sludge back to the biological treatment tank or mix it with the primary sedimentation sludge for discharge. At least one ultrasonic vibrator is installed on the circulation pipeline. Through high-frequency vibration and cavitation effects excited by piezoelectric ceramic plates, the thickened sludge is broken down, releasing organic matter and increasing its biodegradability. After being returned to the biological treatment tank, it is more easily assimilated and metabolized by microorganisms. This system can reduce excess sludge accumulation, inhibit filamentous bacteria proliferation, improve settling properties and effluent stability, and balance sludge reduction benefits with energy economy.

Claims

1. An aerobic 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; a biological treatment tank connected to the primary sedimentation tank for receiving and biologically treating the primary sedimented wastewater, and outputting biologically treated wastewater; a sludge thickening tank connected to the biological treatment tank for receiving and thickening the sludge contained in the biologically treated wastewater, and outputting treated effluent and thickened sludge; a circulation pipeline is also provided between the sludge thickening tank and the biological treatment tank, and a reversing valve is provided on the circulation pipeline, the reversing valve having a first flow direction and a second flow direction; in the first flow direction, the thickened sludge is guided to circulate to the biological treatment tank for treatment; in the second flow direction, the thickened sludge is guided to mix with the primary sedimented sludge to form waste sludge for output; At least one ultrasonic oscillator is installed on the circulation pipeline and located between the sludge thickening tank and the reversing valve. The ultrasonic oscillator is used to receive and ultrasonically process the thickened sludge to output ultrasonically processed thickened sludge to the reversing valve. The reversing valve diverts the flow to the first flow direction or the second flow direction according to the concentration of the ultrasonically processed thickened sludge.

2. The ultrasonic sludge reduction aerobic treatment system as described in claim 1, wherein, The biological tank is also equipped with an independent return pipeline; the aerobic treatment system includes two sets of ultrasonic oscillators, namely a first ultrasonic oscillator located on the return pipeline and between the reversing valve and the sludge thickening tank, and a second ultrasonic oscillator located on the independent return pipeline. The second ultrasonic oscillator and the independent return pipeline are used to circulate and ultrasonically treat the biologically treated wastewater in the biological tank.

3. The ultrasonic sludge reduction aerobic treatment system as described in claim 1, wherein, The aerobic treatment system includes two sets of ultrasonic vibrators. The two sets of ultrasonic vibrators are a first ultrasonic vibrator installed on the circulation pipeline and located between the sludge thickening tank and the reversing valve, and a third ultrasonic vibrator installed on the output pipeline of the primary sludge. The ultrasonically treated thickened sludge is returned to the biological tank along the circulation pipeline, or the ultrasonically treated thickened sludge is mixed with the primary sludge to form the waste sludge output.

4. The ultrasonic sludge reduction aerobic treatment system as described in claim 3, wherein, The primary sedimented sludge is ultrasonically treated by the third ultrasonic oscillator to form ultrasonically treated primary sedimented sludge output. A switching valve is also provided on the output pipeline of the ultrasonically treated primary sedimented sludge, which has a third flow direction and a fourth flow direction. In the third flow direction, the ultrasonically treated primary sedimented sludge is guided to circulate to the biological tank for treatment. In the fourth flow direction, the ultrasonically treated primary sedimented sludge is guided to mix with the ultrasonically treated concentrated sludge to form the waste sludge output.

5. The ultrasonic sludge reduction aerobic treatment system as described in claim 1, wherein, The biological tank is also equipped with an independent return pipeline; the aerobic treatment system includes three sets of ultrasonic vibrators, namely a first ultrasonic vibrator located on the circulation pipeline between the sludge thickening tank and the reversing valve, a second ultrasonic vibrator located on the independent return pipeline, and a third ultrasonic vibrator located on the output pipeline of the primary sludge; wherein, the second ultrasonic vibrator and the independent return pipeline are used to circulate and ultrasonically treat the biologically treated wastewater in the biological tank; the primary sludge and the thickened sludge are ultrasonically treated by the third ultrasonic vibrator and the first ultrasonic vibrator respectively, and then mixed to form the waste sludge output.

6. The ultrasonic sludge reduction aerobic treatment system as described in claim 1, wherein, The biological tank is also equipped with an independent return pipeline; the aerobic treatment system includes three sets of ultrasonic vibrators, namely a first ultrasonic vibrator located on the circulation pipeline and between the sludge thickening tank and the reversing valve, a second ultrasonic vibrator located on the independent return pipeline, and a third ultrasonic vibrator located on the output pipeline of the primary sludge; wherein, the second ultrasonic vibrator and the independent return pipeline are used to circulate and ultrasonically treat the biologically treated wastewater in the biological tank; the primary sludge and the thickened sludge are ultrasonically treated by the third ultrasonic vibrator and the first ultrasonic vibrator respectively, and then mixed to form the waste sludge output.

7. The aerobic treatment system for ultrasonic sludge reduction as described in claim 1 further includes a concentration sensor for monitoring and detecting the discharge index of the concentrated sludge, so that the system can control the flow direction of the reversing valve; when the biological tank is not overloaded or the concentrated sludge does not exceed the discharge index, the concentrated sludge is controlled by the reversing valve to flow into the circulation pipeline to circulate back to the biological tank; when the biological tank is overloaded or the concentrated sludge exceeds the discharge index, the concentrated sludge is controlled by the reversing valve to flow and mix with the primary sludge to form the waste sludge output.

8. The ultrasonic sludge reduction aerobic treatment system 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 aerobic treatment system.

9. The ultrasonic sludge reduction aerobic treatment system as described in claim 8, 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.

10. The ultrasonic sludge reduction aerobic treatment system as described in claim 8 or 9, 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.

11. The ultrasonic sludge reduction aerobic treatment system as described in claim 10, wherein, The amplitude transformer is a long rod with a stepped or constricted shape. The amplitude transformer is coaxially connected to the amplifier to output a concentrated ultrasonic amplitude, and enables the ultrasonic oscillator to efficiently couple mechanical vibration to the sludge flow when the aerobic treatment system is running.

12. The ultrasonic sludge reduction aerobic treatment system as described in claim 8, 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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