SOURCES OF PHOSPHORUS CONCENTRATION INCREASE IN WASTEWATER INCOMING TO WASTEWATER TREATMENT PLANTS AND METHODS OF ITS REMOVAL
Wastewater incoming to a wastewater treatment plant (WWTP) has several sources of phosphorus saturation: wastewater from housing estate and industrial enterprise, sludge water of excessive activated sludge compactors, sludge water seals the joint condensation of raw sludge and excess activated sludge or sludge water of sludge dewatering basin of combined thickening raw sludge and excessive activated sludge, sludge water of sludge dewatering basin of washed sludge in schemes with sludge digesters and vacuum filters, as well as sludge water of sludge beds, centrifuge effluent of centrifuges and filtrate of filter presses. Advantages and disadvantages of known methods of phosphorus removal are listed. Comparative evaluation of reagents used for phosphorus removal is made and necessary conditions for a successful crystallization process are shown. Experimental data are analyzed from the point of view of their possible application at functioning WWTPs.