| 摘要 |
<p>A process for liquefying microorganisms present in biosolids, such as waste activated sludge, generated by municipal or industrial wastewater treatment plants is disclosed. The process includes the step of passing a slurry of the sludge at a high pressure through a nozzle having a restricted flow area to cause liquefication of the microorganisms as they are discharged from the nozzle. The pressure drop across the nozzle preferably exceeds 5,000 psi. At least part of the liquefied microorganisms may be recirculated to the treatment facility to feed nutrients to the wastewater treatment process. Optionally, the liquefied microorganisms may be anaerobically converted to methane and carbon dioxide. For optimum results, the sludge is subjected to pH adjustment and/or maceration prior to being pumped through the high pressure nozzle.</p> |
