INHIBITING THE PRODUCTION OF ODORS FROM DEWATERED RESIDUALS USING NITRATES AND ANTHRAQUINONES

摘要

This paper reports on the use of chemical addition to dewatered residuals for odor control. Odoris the number one obstacle to land application of biosolids and residuals. The chemicals usedwere calcium nitrate solution and anthraquinone particles. Nitrate salt was evaluated alone andin combination with anthraquinone. Both chemicals are commercially available and are used tocontrol hydrogen sulfide in sewer systems. Experiments were conducted on both limed andunlimed samples of dewatered residuals from the Blue Plains Facility. Odor characterization forthese experiments was conducted using a simplified plant panel and analytical determinationusing a solid phase microextraction technique. Other experiments were conducted on unlimeddewatered biosolids from the Philadelphia Water Department Facilities. These experiments usedonly a mixture of nitrate and anthraquinone particles. This paper will report only on the BluePlains results. The results from PWD are available in Higgins et al paper also presented in thisconference.Results showed that nitrate salt addition is capable of significantly reducing sulfur odorcompounds. The use of the anthraquinone particles with the nitrate salt resulted in further odorreduction. This effect was more pronounced on the limed residuals. However, the determinationof the odor compounds did not correlated, however, with the odor detection from the simplifiedpanel. Therefore, the use of these chemicals should be tested at more facilities with differentresiduals in order to document success and the exact conditions of use. Future research thatincludes controlled addition on different biosolids and residuals coupled with long term full scaledocumentation is also warranted.