Reading guidance：The technology application-use ultrasonic to dispose sludge Ultrasonic sludge treatment equipment in foreign sewage treatment has been widely used, using ultrasonic devices can reduce the existing sewa

The technology application-use ultrasonic to dispose sludge
    Ultrasonic sludge treatment equipment in foreign sewage treatment has been widely used, using ultrasonic devices can reduce the existing sewage treatment plant renovation cost, improve sewage treatment capacity, inhibit the production of sludge foam and enhance the bio gas yield and improve the volatile solids removal rate. This paper introduces German sludge treatment equipment in the sewage treatment plant use and related experimental data.
 1. Ultrasonic technology can restrain bulking sludge and bubble sludge
    Bulking sludge is a kind of sludge whose settling property is bad. Its dilution index (ISV) is higher than 150ml/g. There are many filamentous bacteria. Ultrasonic treatment technology can make the like like bacteria automatic tissue decomposition, and can improve the surface properties of the sludge matrix and treatment anaerobic degradation is not damaged the sludge, and does not produce foam. Through building a containerized ultrasonic sludge treatment system, composed of 5kW ultrasonic equipment and five 200 liters of anaerobic oxidation pond, respectively in the three sewage treatment plant experiments were carried out, processing the sludge dilution index decreased significantly. Sewage treatment plant in order to suppress the bubble sludge, in front of the sludge digestion tank increased a ultrasonic sludge treatment process, after ultrasonic treatment sludge is no longer produce bubbles, improve the bio gas yield, volatile solids removal rate for 61% to 45%.
2. Ultrasonic technology can improve aerobic stability
 In order to increase stability of sludge, sewage treatment plants reduce bulking sludge and avoid to add aerobic digestion pools.   In the sewage treatment process increases the ultrasonic sludge treatment equipment. According to the observation, ultrasonic equipment working 24 hours a day, 30% of the total amount of sludge, sludge volume of experimental results decreased by 20%, destroyed the bulking sludge and reduce the sludge volume index range 140ml/g-85ml/g.
     3. Ultrasonic technology can improve aerobic digestion
   When the amount of sludge per day increase accordingly, which leads to the three original sludge tank volume is not enough (fermentation time 25 days). After the comparison of the plan, the factory to buy three sets of ultrasonic sludge reactor for sludge pretreatment. One of the two sets of runs three months after the bio gas production increased by 30%, sludge retention time decreased from 25 to l8d. To meet the in not to build new sludge tank to ensure the digestion depth. According to observation data can see the volatile solids removal rate ranged 60%-54%.
Research work of ultrasonic disposal equipment
   Study on domestic ultrasonic sludge treatment is still in the laboratory stage, using ultrasonic equipment of small power of a small amount of sludge, obtained some laboratory data, far from the engineering application stage. There is no report which units have developed high power ultrasonic sludge treatment equipment used in sewage treatment plant, the existing ultrasonic equipment the application in engineering is imported from Germany. In order to meet the requirement of engineering application, many domestic units to carry out the development of high-power ultrasonic fluid equipment, equipment including high power transducer and high power amplifier. Based on the above reasons, Hangzhou Applied Acoustics Research Institute developed high power ultrasonic equipment, high-power ultrasonic system was completed, the work frequency for 20kHz, the maximum continuous power is 3KW, can deal with large amounts of fluid. It is also designed using fluid industry The handling box, which has the advantages of compact design, easy integration into existing systems, is simply connected (standard pipe or hose connectors), the interface supports the traditional pressure pump system.
Running cost of ultrasonic sludge disposal equipment
Mainly introduce input and running situation of ultrasonic sludge disposal equipment
 A. Cost
1. Price of two sets of ultrasonic equipment, PLC control system, stainless steel pipeline and sludge pump is 220000 RMB; the equipment can run for 10 years. Its value will reduce by 32000 RMB a year.
2. Electricity cost for running equipment is 10106 RMB a year. Ultrasonic transducer change time is 15000 hours, maintain 1 hours every week.
3. Total cost is 42106 RMB
Profit
Improve digestion ability by 32%; the degradation rate of VS is increased by 34% to 45%.
1. About 259875 cubic meters can be reduced; About 37125 disposal cost can be saved;
2. About 259875 cubic meters of methane can be increased;
3. Economic profit: 120385 RMB
Ratio between cost and profits
   From the above data can be analyzed, the cost of the equipment to run three years of ultrasonic equipment will be able to recover the cost of the equipment.
   Ultrasonic sludge treatment technology is very obvious, it can reduce the amount of sludge, increase bio gas yield, control inflation bubble and sludge sludge, reduce the sludge retention time, improve the TN, TP removal rate. The technology around the world accept rate is not very high, generally considered the ultrasonic sludge treatment high energy consumption, the sludge is a kind of biological energy awareness is not enough, but with time the technology must be acknowledged by the whole world.
 
 
 

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