| Title | Characteristics of sand recovered from the municipal wastewater treatment plant |
|---|---|
| ID_Doc | 24701 |
| Authors | Górka, J; Poproch, D; Cimochowicz-Rybicka, M; Luszczek, B |
| Title | Characteristics of sand recovered from the municipal wastewater treatment plant |
| Year | 2023 |
| Published | Gospodarka Surowcami Mineralnymi-Mineral Resources Management, 39, 2 |
| Abstract | This article investigates the possibilities of the recovery of raw materials at the Krakow-Plaszow municipal wastewater treatment plant (WWTP). The materials include sand coming with raw sewage and delivered by septic tankers, after cleaning sewage systems. Following the Regulation of the Min-ister of Climate (January 2020), sand from grit chambers is classified in the waste catalog as waste, with the code of 19 08 02. (Journal of Laws of 2020, item 10). The purchase of very efficient units has optimized the grit chamber operation and minimized the amount of waste generated as well as being an odor nuisance. The paper presents a mass balance for sand collected at the WWTP. Due to the use of new sand separators, the amount of this waste has been reduced by 28%. The paper presents the sieve curves of sand collected at the wastewater treatment plant and during the cleaning of sewage wells, as well as for sand mixtures. The sand mixture was prepared to allow some variations in the grain size characteristics of the sand. The graining differentiation indexes and curvature indexes were calculated. In addition, in laboratory tests, the leachability of heavy metals and the content of dry matter (DM) and dry mineral matter (DMM) were determined. The laboratory tests confirmed the reduction of organic solids to a level below 3% of dry weight; the content of heavy metals remained below the level of detection. The experiments confirmed that sand from the WWTP can be used as fine-grained aggregate in the production of concrete. |
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