The malodor problem from the dewatering and storage of liquid sludge from chemically-enhanced primary treatment (CEPT) process is an urgent problem. Hydrogen sulfide (H2S) is generated at different stages of CEPT liquid sludge processing starting from the liquid sludge holding tanks to dewatering centrifuges and dewatered sludge storage silos and transport container. The H2S, NH3 and VOCs are continuously generated by microbial actions during the entire process. Hydrogen sulfide is particularly problematic. It is generated by sulfate reducing bacteria (SRB) under septic condition, is released from the liquid sludge in the holding tanks, during the dewatering process and from the sludge cake stored in silos. A new approach based on the use of a multifunctional odor-control (MOC) gel based on a controlled and sustained dosing of a mixture of disinfectants, metabolic inhibitors, H2S suppressant at low concentrations was successfully implemented for H2S odor suppression at both laboratory-, bench- and pilot-scales. The MOC gel selectively targets SRB decreasing both their viability and activity, while simultaneously scavenging dissolved sulfide. Indeed, a gel containing less than five percent active ingredient can decrease H2S emission by more than 90 % at a one weight percent gel-to-sludge loading.

Odor-control technology for H2S malodor problem in dewatered sludge from chemically-enhanced primary treatment process

255th National Meeting (2018)

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