Coma M, Rovira S, Canals J, Colprim J
LEQUIA. Institute of the Environment, Facultat de Ciències, Universitat de Girona, c/ Maria Aurèlia Capmany, 69, E-17071 Girona, Catalonia, Spain E-mail:
Gs Inima, Calle Tarragona 149-157, planta 7, 08014 Barcelona, Spain.
Water Sci Technol. 2015;71(7):1056-64. doi: 10.2166/wst.2015.067.
Integrated processes to reduce in situ the sludge production in wastewater treatment plants are gaining attention in order to facilitate excess sludge management. In contrast to post-treatments, such as anaerobic digestion which is placed between the activated sludge system and dewatering processes, integrated technologies are placed in the sludge return line. This study evaluates the application of an anoxic side-stream reactor (SSR) which creates a physiological shock and uncouples the biomass metabolism and diverts the activity from assimilation for biosynthesis to non-growth activities. The effect of this system in biological nutrient removal for both nitrogen and phosphorus was evaluated for the anaerobic, anoxic and aerobic reactors. The RedOx potential within the SSR was maintained at -150 mV while the sludge loading rate was modified by increasing the percentage of recycled activated sludge feed to the SSR (0 and 40% at laboratory scale and 0, 10, 50 and 100% at pilot scale). The use of the SSR presented a slight reduction of phosphorus removal but maintained the effluent quality to the required discharge values. Nitrogen removal efficiency increased from 75 to 86% while reducing the sludge production rate by 18.3%.
为了便于剩余污泥管理，减少污水处理厂原位污泥产量的综合工艺正受到关注。与后置处理（如置于活性污泥系统和脱水工艺之间的厌氧消化）不同，综合技术置于污泥回流管线中。本研究评估了缺氧侧流反应器（SSR）的应用，该反应器会造成生理冲击，使生物质代谢解偶联，并将活性从生物合成的同化作用转移到非生长活动。针对厌氧、缺氧和好氧反应器，评估了该系统在生物脱氮除磷方面的效果。SSR内的氧化还原电位维持在-150 mV，同时通过增加回流活性污泥进料至SSR的百分比来改变污泥负荷率（实验室规模为0和40%，中试规模为0、10、50和100%）。使用SSR使磷去除率略有降低，但出水水质仍保持在所需排放值。脱氮效率从75%提高到86%，同时污泥产率降低了18.3%。
