| 摘要 |
<p>Equipment for treating sludge created by an aerobic waste treatment plant, the equipment comprises an ultrasonic irradiation duct through which the sludge is flowing. The duct comprises a cylindrical pipe with a multiplicity of ultrasonic transducers attached to the outside of the pipe in an array of separate transducers, that extends both circumferentially and longitudinally. Each transducer is connected to a signal generator so that the transducer radiates no more than 3 W/cm<2>. The equipment further comprises an anaerobic digester with an outlet for biogas. Sludge, that has passed through the duct, is supplied to the digester, and energy is obtained from the biogas in a conversion step, e.g by using an electricity generator driven by an engine for which the biogas is the fuel. The irradiation breaks up cell walls and reduce the bulk of the sludge, and useful electrical energy is produced. Heat can be transferred from the conversion step to the sludge, that is caused to flow through the duct, and so enhancing the effectiveness of the ultrasonic irradiation. The equipment is e.g. a module, incorporating a support frame, the module being of convenient size for transport.</p> |
