A NEW SENSING TECHNIQUE FOR OPTIMUM SLUDGE CONDITIONING FOR WASTE SLUDGE DEWATERING

A new sensing technique using a Hot-Film sensor for determining the op timum polymer dosage for sludge dewatering has bern developed. Correla tions between the behavior of the Hot-Film sensor and dewaterability o f sewage and night soil sludge were investigated. The results of the s tudy revealed the following: the Hot-Film sensor values depended on th e filtrate characteristics related to the sludge dewaterability which is measured by the filterability of the conditioned sludge and by the moisture content of the dewatered sludge cake; the optimum polymer dos age for sludge dewatering corresponded with the minimum output value o n the characteristics curve of the Hot-Film sensor. This paper describ es the observations of the measurement test by the Hot-Film sensor as well as the results of the laboratory test of sludge dewatering for op timum sludge conditioning.