Vertical MBBR-based sewage treatment in a limited space (India)
With increasing population, waste generation has increased and with vide choice of technology available, it is imperative to consider available limited resources wisely before concluding any new scheme/development. An Innovative engineering design for land deficient projects, i.e., to best fit 7.5 MLD STP plant in 1,030 m2 densely populated area covered with residential building all around, overcoming hydraulic challenge for vertical multi-level construction, reducing the velocity of high MLSS liquor when falling from a height of 20 m into the secondary clarifier and overcoming climatic challenges and soil condition for such constructions of vertical sewage treatment plants was part of this thesis. The study concentrated on process design based on ANOX-KALDNESS MBBR process, hydraulic drops within limits of vertical flow movement, complex structural multi-layered component designing, smart oxygen control system, fit to size-disc filtration system, and smart control systems. A vertical frame to fit equalization tank, conventional clarifier and reactors was designed which left a very small amount of space to place equipment rooms and so general arrangement was prepared in such a way that accommodates equipment set up within the single frame. After placing this frame, a small plot was available for primary treatment Therefore, another vertical frame was designed to accommodate wet well and primary treatment unit which was placed above. The plant is presently running successfully with all parameters achieved under Clean Ganga Mission standards.
