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Influence of digested sludge conditioning on the dewatering processes and the quality of sludge liquid

Bień Beata, Bień Jurand D.

Ecological Chemistry and Engineering. S

2020

Vol. 27, nr 1

151--164

To increase the dewatering effect, sewage sludge should be properly prepared before dewatering. Sludge conditioning is a process whereby sludge solids are treated with chemicals or various other means to improve dewatering characteristics of the sludge by reducing the specific resistance and compressibility of the sludge. The aim of the research was to determine the possibility of increasing the efficiency of sewage sludge dewatering by applying chemical agents and ultrasonic field. Some parameters, such as suspension, chemical oxygen demand (COD), phosphorus and ammonium nitrogen content in sludge supernatant, were also analysed. Digested sludge belonged to the group of hardly dewatered sludge, its capillary suction time (CST) was of high value (2639 s). The lowest CST value (88.5 s) was obtained for the unsonicated sludge prepared only with PIX 113 at a dose of 7.0 mg/g d.m. Both the dose and the type of chemicals used, as well as the time of sonication, had an impact on the changes occurring in sludge properties. The increase in mechanical dewatering efficiency was obtained by using a combination of methods applied for sludge preparation, where the sonication of sludge was used at the preliminary stage and followed by dosing chemical substances. This resulted in the reduction of sludge final hydration and changes of other parameters. In addition, combined action of PIX 113 and Zetag 8180 allowed to reduce the content of suspended solids and COD in sludge supernatant.

Variability of Selected Parameters As A Result of Microwave Disintegration of Sewage Sludge

Czajkowska J., Nowak P., Malarski M., Pergół K.

Quarterly of Environmental Engineering and Design

2018

Vol. 171 (51)

56--63

The article contains the results of research carried out at the SGGW Water and Sewage Institute in Warsaw regarding the pre-treatment of sewage sludge by means of microwave disintegration. Sewage sludge came from the "Mokre Łąki" sewage treatment plant in the Izabelin commune. Experiments were carried out on thickened and unthickened sludge. Every sludge was disintegrated in portions of various volumes, as well as at different times of microwave influence. Significant changes in the values of the tested parameters were noted, such as: COD, turbidity and temperature due to the use of sludge sonification process. These parameters have a significant impact on the course of further processes, which may be subject to processed sewage sludge and supernatant liquid. Therefore, determining the variability of these parameters is important.