ТИТАНСОДЕРЖАЩИЕ КОАГУЛЯНТЫ В ПРОЦЕССАХ ОЧИСТКИ ХОЗЯЙСТВЕННО-БЫТОВЫХ СТОЧНЫХ ВОД

Abstract

Introduction. Post-treatment of wastewater that has passed the stage of deep purification from biogenic elements is a pressing issue that has not been fully solved yet. Traditional reagents based on aluminum salts used to remove phosphorus compounds have a few significant drawbacks and do not always make it possible to achieve the standards established for the discharge of treated water into fishery reservoirs. Titanium-based coagulants are promising and highly effective reagents that have shown high efficiency in treating wastewater of various origins. Complex titanium-based coagulants are binary coagulants obtained by introducing hydrolysis products of titanium compounds in an amount of up to 10 % wt into the composition of traditional aluminum-based coagulants. Methods. Trial coagulation was carried out using a VELP laboratory flocculator; spectrophotometry, turbidimetry, and atomic emission spectral analysis were used to assess the purification efficiency. Results. It has been found that the use of titanium compounds and complex titanium-based coagulants can improve the efficiency of purification, as well as reduce the residual content of phosphate ion to the MPC standards. We have determined the main regularities in the use of complex titanium-based reagents and established the effect of the dose and pH of the medium on the efficiency of phosphate ion removal. It has also been found that the residual concentration of phosphate ion in treated water using titanium-based coagulants is significantly lower than when using traditional reagents. Titanium-based coagulants operate in a wider pH range, while the requirements for the residual concentration of titanium ions in treated water are much softer than for that of aluminum. It has been proved that the use of complex titanium-based reagents makes it possible to significantly intensify the processes of sedimentation and filtration of sludge formed during coagulation water treatment. Conclusion. In the course of the study, we have confirmed the prospects of using titaniumbased coagulants in domestic wastewater treatment.