Studying the technology of wastewater sludge chemical dewatering with the help of experimental-statistical models

Summary

The results of experimental studies of the specific resistance of raw wastewater sludge changing under the effect of six types of coagulants and a polyacrylamide flocculant at doses ranging from 0 to 5.25 g/kg dry matter are presented. The effect of each chemical on the raw sludge dewatering rate is determined. Mathematical models are obtained for the dependence of changes in sludge specific resistance on the coagulant and flocculant amount added. The mathematical models are presented both as implicit and explicit equations, and as explicit isolines. It is proven that more expedient is using polyoxyaluminum sulfate and aluminum sulfate coagulants at a dose of up to 5.25 g/kg dry matter and a polyacrylamide flocculant at a dose of 5.25 g/kg dry matter which provide for maximum reducing the raw sludge specific resistance.

Key words

primary settler , optimal dose of chemicals , sludge specific resistance , сырой осадок сточных вод , mathematical and graphical models of sludge water yielding capacity