Abstract
The purpose of studies was to assess the potential effectiveness of phosphorus compounds removal from waste water by biological method. Phosphorus removal is very important because of strict standards to phosphate concentration in effluent. But removal of phosphorus by chemical method requires a lot of reagents. Moreover objectives of research were to determine actual efficiency of the biological phosphorus removal. The study shows that under certain technological parameters of biological treatment it is possible to meet strict requirement phosphate removal. This technology can be implemented on existing wastewater treatment plants. The technology of biological phosphorus removal can be combined with the technology of nitrification and denitrification.
Highlights
Technology of biological phosphorus removal selected for investigation based on the ability of activated sludge to consume phosphate actively in aerobic conditions after treatment of recirculated activated sludge in anaerobic conditions, where phosphates are releasing from sludge to liquid phase [1,2,3]
Scheme with deep phosphorus removal includes treatment of waste water in installations of traditional biological treatment that is in primary clarifier, aeration tank and secondary clarifier
That is why biological phosphorus removal means two tasks to be solved such as deep phosphorus removal without using of reagent in the main treatment installations, and producing of additional product – fertiliser [4,5,6]
Summary
Technology of biological phosphorus removal selected for investigation based on the ability of activated sludge to consume phosphate actively in aerobic conditions after treatment of recirculated activated sludge in anaerobic conditions, where phosphates are releasing from sludge to liquid phase [1,2,3]. Scheme with deep phosphorus removal includes treatment of waste water in installations of traditional biological treatment that is in primary clarifier, aeration tank and secondary clarifier. Phosphorus release from recirculated activated sludge takes place in special additional installation like secondary clarifier. The most suitable reagent for phosphorus removal from this flow is lime. In this case P-Ca-containing sludge is formed. This sludge includes two main elements of mineral fertiliser, which is suitable for soil fertilisation and raising its alkalinity. That is why biological phosphorus removal means two tasks to be solved such as deep phosphorus removal without using of reagent in the main treatment installations, and producing of additional product – fertiliser [4,5,6]
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