Abstract
The utilization of drinking water sludge (DWS) as geomaterial is important to reduce its volume that needs to be disposed of and to increase environmental sustainability. In this regard, a simple dehydration technique using drainage strings was applied to DWS in laboratory and field conditions. From the laboratory test, it was confirmed that the sludge in initial water content of 570% was dewatered below the liquid limit of 300% for a week. From the field test, the raw sludge was dewatered, and it was found that the simple vertical drain method accelerates the dewatering rate of DWS smoothly compared to the control test. The cone index test was performed on the DWS mixed with sandy soil for utilization as geomaterial. It is clarified that the initial water content of the DWS should be reduced for decreasing the sand mixing fraction and improvement cost. The environmental effect on utilization of DWS was assessed based on CO2 emission in LCA. The result showed that the DWS by the simple vertical drain method and mixing sandy soil has the CO2 emission less than 1/5 of that of belt filter press with cement mixing.
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Flemmy, S.O., Omine, K. & Zhang, Z. Simple dehydration technique using drainage string to treat drinking water sludge for utilization as geomaterial. J Mater Cycles Waste Manag 24, 1355–1367 (2022). https://doi.org/10.1007/s10163-022-01420-x
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DOI: https://doi.org/10.1007/s10163-022-01420-x