PROCESS FOR TREATMENT OF SEWAGE SLUDGE

摘要

A method for pathogen destruction in dilute sewage sludge or other dilute streams containing pathogens, including Helminth ova, while minimizing vapor generation and atmospheric emissions. In addition to conventional waste treatment steps, including grit removal, clarification, and concentration of waste material, vaporized waste treatment compounds are recycled to treat divert untreated waste in a scrubber. In the scrubber, waste material is treated while also acting as a reactive agent to scrub potentially hazardous or noxious gas, particularly gaseous MITC, from the treatment system. Recycling of vaporized treatment compounds provides a reduction of potentially toxic emissions and increased efficiency during treatment.

主权项

1) A waste treatment method comprising:
providing a fluid stream of a waste material into a waste treatment system; diverting an ancillary portion of the waste material to a scrubber; providing a primary portion of the fluid stream of the waste material to a mixing reaction vessel; adding an MITC generating compound to the mixing reaction vessel; mixing a combined material comprising the primary portion of the waste material and the MITC generating compound in the mixing reaction vessel for a period of time sufficient to distribute MITC generating compound throughout the primary portion of the waste material; providing a mixed material comprising the MITC generating compound and the primary portion of the waste material to a holding tank; adding an alkaline compound sufficient to raise the pH of the mixed material in the holding tank; incubating the mixed material in said holding tank at an increased pH for a period of time sufficient to generate a treated material from the mixed material by substantially killing pathogens not previously destroyed by the MITC; providing a holding tank off-gas line to route a holding tank MITC vapor from the holding tank to the scrubber; providing the treated material to an MITC removal tank; providing an MITC removal tank off-gas line to route a MITC removal tank MITC vapor from the MITC removal tank to the scrubber; discharging the treated material; scrubbing the ancillary portion of the waste material; providing a scrubbed material from the scrubber to the holding tank; and continuously performing the above listed steps.