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This paper reports on results from laboratory and pilot scale experiments designed to test the effect polymer on odor generation from anaerobically digested biosolids. The paper also presents results from full-scale testing designed to examine the effect of odor generated from cakes from three dewatering devices using the same digested biosolids.

Bench scale polymer test results showed that Epi/DMA/MMA based polymers are capable of conditioning anaerobically digested biosolids at higher doses than commonly used acrylamide based-polymers. Biosolids samples containing acrylamide based polymers significantly produced trimethylamine (TMA) upon lime addition while biosolids samples containing (Epi/DMA/MMA) did not generate TMA for the whole incubation period. Difference in polymer structure did not affect production of sulfide odor compounds. Pilot scale tests with one non-acrylamide polymer were not successful in producing cake in centrifuge dewatering.

Full scale dewatering devices test results showed that a commercially available dewatering/drying device produced the least odorous cake as compared to cakes produced from belt filter press and centrifuges at drying times typically used.

The results suggest that plant personnel could alter current practices in conditioning and dewatering and reduce odor potential from the dewatered cake. Since odor is a concern for wastewater treatment plants, operators should select the appropriate dewatering device and conditioning agent to reduce or mitigate odor. Cost benefit analysis must be considered when making these choices.
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Document Type: Research Article

Publication date: 01 January 2005

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