Orange County Utilities conducted pilot testing of a shell-media based biological odor control system at the Stillwater Crossing Pump Station. The shell media has the desirable qualities of availability, low cost, long life, and high sustainability. The purpose of the pilot testing was to verify that the system could provide acceptable H 2 S and odor removal. A skid-mounted, modular pilot unit consisted of a bolted FRP panelled housing, seashell media, control panel, two FRP irrigation sumps, two water recirculation pumps, and a fan with unit-to-fan ductwork and a vertical exhaust stack. The pilot unit was started at 2.83 m 3 /min (100 cfm) and after successful operation was confirmed the airflow was increased to 7.1 m 3 /min and finally to 14.2 m 3 /min (250 and 500 cfm). An ambitious sampling program was performed over a period of 8 months. The data showed that the pilot system provided over 99 percent H 2 S removal at inlet concentrations as high as 124.5 ppm. The pilot unit also provided very good odor removal efficiencies of 98.9, 97.6, 99.6, and 98.9 percent with corresponding final outlet odor of 920, 620, 350, and 575 DT. INTRODUCTIONOrange County Utilities conducted pilot testing of a new biofilter technology at the Stillwater Crossing Pump Station No. 3961 located at 6288 Ficquette Hancock Road, Windermere, Florida. As shown in Figure 1, the site is across the street for a large subdivision. The new technology is produced by Bord na Mona and uses a seashell media referred to as MÓNASHELL TM . The seashell media has the desirable qualities of availability, low cost, long life, and high sustainability. The purpose of the pilot testing was to verify that the system could provide acceptable H 2 S and odor removal. The testing also allowed collection system staff to gain familiarity with the operational requirements of the system. Effective treatment and operator satisfaction with the pilot unit would allow the technology to be considered for full-scale applications on future Orange County projects.

Faced with the task of treating significant volumes of complex industrial wastewaters, the biological components of municipal wastewater treatment plants are operating under the risk of toxic or inhibitory contaminants from the industrial effluents that may be detrimental to their operation. This might lead to undesirable effluent toxicity and/or result in permit violations. Therefore, there is a need for upset early warning systems that can protect full‐scale plants from toxic or inhibitory constituents in the incoming wastewaters. This study focused on the development of a protocol for rapid detection of potentially toxic inhibitory or toxic wastewaters using combined aerobic respirometric and anaerobic batch techniques. Aerobic respirometers equipped with automated data acquisition systems were used as potential early warning devices. The inhibition effect on carbon and nitrogen oxidation was assessed. The degree of inhibition was evaluated as the concentration causing 50% reduction in microbial activity, which was estimated by an inhibition model. Anaerobic toxicity assays were also conducted to evaluate the inhibitory effects of the toxic compounds to anaerobic inocula obtained from a master culture reactor fed with ethanol. The developed protocol for early detection of toxicity was validated using wastewater samples from a biotechnology industry and a food processing industry, and pure chemicals such as furfural and phenol. Varying degrees of sensitivity were observed in the study when different groups of microorganisms, wastewater samples, and chemicals were tested. The comparison of aerobic and anaerobic inhibition suggested the importance of using both aerobic and anaerobic cultures to maximize the necessary sensitivity of the protocol.

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A review of the literature published in 2011 on topics relating to gaseous emissions from wastewater facilities is presented. This review is divided into the following sections: odorant emissions from wastewater treatment plants (WWTPs); greenhouse gas (GHG) emissions from WWTPs; emissions from wastewater collection systems, physiochemical emission control methods; biological odor control methods; odor monitoring; and odor impacts.

A review of the literature published in 2015 on topics relating to gaseous emissions from wastewater facilities is presented. This review is divided into the following sections: odorant emissions from wastewater treatment plants (WWTPs); greenhouse gas (GHG) emissions from WWTPs; gaseous emissions from wastewater collection systems; physiochemical odor/emissions control methods; biological odor/emissions control methods; odor characterization/monitoring; and odor impacts/ risk assessments.