WATER SUPPLY, CANALIZATION EXPERIMENTAL INVESTIGATION OF PLASTIC,f-vl TRICKLING FILTER MEDIA By

Trickling-filter se'wage purification is one of the oldest methods of artifi-cial biological 'waste-'water treatment. Its specific advantages still justify its use, in spite of the rapid development and extension of the activated sludge process. The biological trickling filter as a biochemical reactor is not yet utilized at full capacity. Its construction and operation are expected to undergo further development [I]. The trickling filter operation. of common knowledge, has been treated in several Hungarian and foreign puhlications. Essentials of the processes a~. for example, making allo'wance for the actual influence of temperature. hydraulic and organic loads and intensity variation, character of hiochemical processes inside the trickling filter. the mass of microorganisms, transport and adsorption of oxygen and nutrients as well as the time of contact bet'ween organic matters in solution and in suspension and the biological film have not yet heen cleared [2]. Factors affecting the trickling-filter sewage treatment processes similarly to the activated sludge process, are: nature of sewage to be degraded (quantity, quality), rate and evenness of hydraulic load (return sludge percentage, sewage distrihution). degradation oxygen supply (availahle and consumed). quantity and quality of microorganisms (biological film) performing degradation, temperature conditions (of sewage and atmosphere), operational conditions (filter change, elastic change of load, function in the treatment process) [3, 4]. As seen from the high number of factors, simulation of the process of trickling-filter sewage treatment by exact mathematical models would he rathe