Advanced treatment of wastewater

Establishment of new, advanced treatment of wastewater
including removal of organic waste, nitrate and phosphorus
compounds by combining chemical precipitation; introduction
of sludge hydrolysis process.

For the sake of clarity, the total project is divided into three parts: 1. Chemical Precipitation 2. Sludge Hydrolysis 3. Biological Nitrogen Removal Part One: Chemical Precipitation Today, chemical precipitation of raw waste water is a well established process. The existing pool of experience is, however, based on the usual chemical parameters such as e.g. Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD). In the present connection it is necessary to establish experience based on chemical precipitation in various types of waste water combined with the waste water characteristics identified under part one. The development work in connection with part one, chemical precipitation can be divided into two sub-projects: - Precipitation tests on a laboratory scale - Pilot Studies Part Two: Sludge Hydrolysis A central problem arising in connection with the process combination in question is the fact that at chemical precipitation stage, substandard conditions may be established for the biological nitrogen removal which follows, this in the form of a slowing down of the process speed. One way of improving this could be the establishment of a hydrolysis of the chemically precipitated primary sludge, wherein the sludge water is taken from the hydrolysis to the biological nitrogen removal. The process for the hydrolysis of raw sludge from domestic waste water is not very well documented. Part three will contain a literature search as well as process investigations on laboratory and pilot scales for illustrating the effect of the process as a function of variable parameters such as e.g. retention time, temperature, chemical precipitant. Thus, part three contains three sub-projects: - Literature search - Laboratory tests/pilot studies - a separate process test - Pilot studies - combined process Part Three: Biological Nitrogen Removal The existing knowledge on the effect of the composition of the waste water on nitrification and denitrification is today based on the knowledge of a number of unspecified characterising parameters: COD BOD, suspended matter, etc. The importance of the waste water composition on the biological processes as expressed by specific parameters must be characterized as insufficient. Based on the new and "old" characterization variables, the existing model descriptions of the biological processes will be extended. Afterwards, the models will be tested with data from laboratory tests and from pilot as well as full scale plants. Thus, the development work within part one can be divided into three sub-projects: - Characterisation of waste water - Model extension - Pilot studies/laboratory tests.
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Project costs: 
4 920 000.00€
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