Intensification of nitrogen compound removal process from waste waters by biofilters

The article presents intensification of nitrogen compound removal process from waste waters by biofilters. It was testified that treatment facilities of the public sewage that were built in the 60-70- ss of the past century are generally available for modernization and reconstruction. However, the biofilters responsible for biological treatment stage are extremely outdated. The article presents an advanced technical plan representing alternating aerobiotic — anaerobic (or anoxic) zones, the research of feed properties acceptable for use at reconstruction of such objects securing modern treatment regulations was done. The advantages and disadvantages of the explored technologies and feed were marked. On the ground of data analysis and considering all modern load requirements, the following samples were chosen and examined on the first stage of works: polyvinyl chloride load, material of corrugated PVC pipes cutoffs; watering — cubes in shape of fibers bounding against each other and «BBZ» bioload. During the research the interrelation between biofilm thicknesses, its properties and composition was defined, that can be used at selection of the load material. The biofilter model analysis was intended for the selection of the optimal scheme of ammonia nitrogen removal from waste water. At the second stage of the research the laboratory investigations were carried out using a plant developed by the REC of the Moscow State University of Civil Engineering, a series of experiments of alternating aerobic and anaerobic (anoxic) zones. The work was carried out in two sessions: during the first session four zones were being investigated — 2 aerobic and 2 anoxic zones without recirculation of nitrogen water; during the second session four zones were investigated — 2 aerobic and 2 anoxic zones with recirculation of nitrogen water with different feed. During the laboratory research a principal possibility of achieving the treated waste water objectives which meet modern regulations by means of the suggested process scheme was determined on the basis og the results of sanitary-chemical analysis and biofilm investigation. © 2016, Vodoproekt-Giprokommunvodokanal.Sankt-Peterburg. All rights reserved