Environment Protection Engineering INFLUENCE OF ZEOLITES ON KINETICS AND EFFECTIVENESS OF THE PROCESS OF SEWAGE BIOLOGICAL PURIFICATION IN SEQUENCING BATCH REACTORS

Anna Anielak, Krzysztof Piaskowski
unpublished
Despite applying various modern technologies in treatment plants it is still difficult to maintain the quality coefficient of purified sludge. Allowable concentrations of phosphorus and nitrogen compounds are often exceeded, activated sludge expands and emerges and a foam appears in aeration tank. Such factors as production of small bubbles of gas, high content of surface-active substances and water-repellents as well as the presence of thread and non-thread bacteria are responsible for
more » ... of activated sludge and foam formation. Different methods, mainly physical and chemical, are applied to prevent sludge expansion and foam formation. Their effectiveness, however, changes considerably. They can also cause other problems, eg. precipitation of struvite. This paper deals with the application of natural zeolites to the treatment of surface and ground water as well as municipal sewage. The results obtained prove the zeolite improves the treatment efficiency and prevents the activated sludge from expanding. It is also an appropriate substratum for microorganism growth, increases a specific gravity of activated sludge floccules, increases the rate of its sedimentation and improves the value of its volumetric index.
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