This paper presents a pilot-scale evaluation of an integrated approach to sludge management utilizing a combination of biological nutrient removal and biosolids alkaline hydrolysis, as well as attempts to explore the impact of recycled alkaline hydrolysates on sludge yield and anaerobic digestion. The novel concept of converting an existing conventional activated sludge (CAS) wastewater treatment plant in St. Marys, Ontario to BNR and integrating it with Lystek technology emerged to reduce sludge production and spare the plant expansion of its sludge storage facilities. In the integrated sludge management strategy, first waste activated sludge (WAS) from the BNR system is treated with Lystek technology and thereafter a portion of the Lystek-treated sludge is recycled to the BNR system and the primary digester, and the remaining sludge is pumped to storage/land application.A pilot study was undertaken to demonstrate the effectiveness of the proposed BNR system and to assess the impact of recycling Lystek-treated sludge to the BNR system and anaerobic digester. The pilot plant produced effluent comparable to that of the full-scale plant with biological nitrification/denitrification and phosphorous removal. The addition of Lystek-treated sludge did not have a detrimental effect on the pilot plant treatment efficiency. Anaerobic respirometric studies of pilot plant WAS with the addition of Lystek-treated sludge indicated increased VSS destruction, COD removal, and methane production. At a similar SRT, the pilot plant observed yield was 0.37 gTSS/gCOD, compared to 0.66 gTSS/gCOD for the full-scale system. When combined with Lystek treatment and recycle, the integrated sludge management strategy is expected to achieve an estimated 84% reduction in volumetric sludge disposed from the site.
The performance of an innovative membrane bioreactor (MBR) process using anoxic phosphorus uptake with nitrification and denitrification for the treatment of municipal wastewater with respect to operational performance and effluent quality is addressed in this paper. The system was operated at steady-state conditions with a synthetic acetate-based wastewater at a hydraulic retention time (HRT) of 12 hours and on degritted municipal wastewater at a total system HRT of 6 hours. The MBR system was able to achieve 99% biochemical oxygen demand (BOD), chemical oxygen demand (COD), and ammonia-nitrogen (NH 4 1 -N); 98% total Kjeldahl nitrogen (TKN); and 97% phosphorus removal, producing effluent BOD, COD, NH 4 1 -N, TKN, nitrate-nitrogen, nitrite-nitrogen, and phosphate-phosphorus of ,3, 14, 0.2, 0.26, 5.8, 0.21, and ,0.01 mg/L, respectively, at the 6-hour HRT. The comparison of the synthetic and municipal wastewater run is presented in this paper. Steady-state mass balance on municipal wastewater was performed to reveal some key features of the modified MBR system. Water Environ. Res., 78, 2193Res., 78, (2006.
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