The double stage of nitrification /denitrification technology for high nitrogen content waters allows to diminish the energetic consumptions relative to the recycling from the divisions of nitrification to the divisions of denitrification. The subdivision and separation of the nitrification processes and denitrification concur moreover a possible reduction of the volumes of the necessary biological reactors, reducing the air requirement for the biological oxidation regarding the single stage of nitrification/denitrification biological process to.
Solution that often concurs the maximum reliability and the lower investment cost. The biological process can be of the type with nitrification and denitrification. The optimization of the management of the plant will allow to diminish the eventual consumption of external COD. SBR Solution finds advantage above all when the capacity of effluent is modest so the use of a biological ”batch” reactor allows to avoid the employment of too much small units and therefore unreliable.
The employment of membrane plants allows to reduce the necessary volumes for the aerobic biological treatment. The treated water, deprives of suspended solid and bacterial loads, turns out adapted to the implementation of possible recycling in production, also thanks to the implementation of successive membranes treatments (nano filtration/reverse osmosis), concurring the closing of the waters cycle of the productive cycle.
Granular Sludge Anaerobic Technology
The granular sludge anaerobic technologies (UASB, IC, EGSB) are employed with success in depuration of wastewater containing classes of easy biodegradable compounds, between which sugars and alcohols, as food industries (brewery, working yield, alcoholics, potatoes-work) process water, or amides, as paper mills industry one.
The anaerobic pretreatment of waste waters with outside specific renders in many cases profitable the implementation of an anaerobic granular sludge pretreatment also downstream of an existing aerobic biological treatment: the reduction of energetic consumptions, the reduction of exceed mud joined to the valorisation of the produced biogas, allow a profitable management of the entire treatment plant consenting a return of the investment in few years. The anaerobic granular sludge pretreatment moreover allows to increase the total biodegradability of the effluent, allowing the finishing aerobic division to specialize itself in the abatement of the more bio-refractory species.