Water Online

September 2014

Water Online the Magazine gives Water & Wastewater Engineers and end-users a venue to find project solutions and source valuable product information. We aim to educate the engineering and operations community on important issues and trends.

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BNR 101: Pilot Study clarifier) was added before the ANITA Mox stage to ensure influent with a low biodegradable COD concentration coming to the ANITA Mox stage. Both C-stage and ANITA Mox reactors were started with 100-percent-seeded carriers (AnoxKaldnes K5 plastic media carriers), which were obtained from the ANITA Mox pilot plant in Denver. Figure 2 on the next page shows the actual system layout in the plant. The C-stage reactor was located on the shelf, and the ANITA Mox reactors were located on the table. Table 1 on the next page sum- marizes the reactor volumes, media volumes, and media surface areas in the bench-scale reactor system. The feed was the old leachate that was delivered from the Rumpke Sanitary Landfill on a weekly basis. Table 2 on the next page summarizes the feed characteristics during the testing period. The characteristics indicate a variation of a factor of 10 between the maximum and minimum values on COD, total suspended solids (TSS), and ammonia with a pH range from 7.6 to 10.6. For both the MBBR and IFAS phases, the influent flow rate was adjusted to achieve relatively stable performance. Nitrogen components (ammonia, nitrate, and nitrite), COD, TSS, and alkalinity were measured daily in each reac- tor for influent and effluent. The operating conditions (e.g., dissolved oxygen [DO], temperature, pH, and intermittent aeration cycles) were monitored by online probes, and DO was controlled manually with adjustment of airflow. Results And Discussion Figure 3 on page 28 presents the COD removal performance for both the MBBR and IFAS phases. During the MBBR phase, the C-stage was capable of removing a majority of the influent COD, and not much COD was left to the ANITA Mox stage. On 25 wateronline.com ■ Water Online The Magazine Process control (DO, pH, temperature, and free ammonia) is key to maintaining the right microbial population and structure to maximize performance .

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