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This paper reports on the use of chemical addition to dewatered residuals for odor control. Odor is the number one obstacle to land application of biosolids and residuals. The chemicals used were calcium nitrate solution and anthraquinone particles. Nitrate salt was evaluated alone and in combination with anthraquinone. Both chemicals are commercially available and are used to control hydrogen sulfide in sewer systems. Experiments were conducted on both limed and unlimed samples of dewatered residuals from the Blue Plains Facility. Odor characterization for these experiments was conducted using a simplified plant panel and analytical determination using a solid phase microextraction technique. Other experiments were conducted on unlimed dewatered biosolids from the Philadelphia Water Department Facilities. These experiments used only a mixture of nitrate and anthraquinone particles. This paper will report only on the Blue Plains results. The results from PWD are available in Higgins et al paper also presented in this conference.

Results showed that nitrate salt addition is capable of significantly reducing sulfur odor compounds. The use of the anthraquinone particles with the nitrate salt resulted in further odor reduction. This effect was more pronounced on the limed residuals. However, the determination of the odor compounds did not correlated, however, with the odor detection from the simplified panel. Therefore, the use of these chemicals should be tested at more facilities with different residuals in order to document success and the exact conditions of use. Future research that includes controlled addition on different biosolids and residuals coupled with long term full scale documentation is also warranted.
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Document Type: Research Article

Publication date: 2002-01-01

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