Changes in sludge quality at the water treatment plants

Wojciech Balcerzak,

Stanisław M. Rybicki

Abstrakt

This paper presents the variability of the quantity and specific composition of the sludge produced at two different surface water treatment plants ‒ the Raba water treatment plant (WTP), collecting water from an artificial reservoir; and the Rudawa WTP, collecting running surface water. The authors analyzed the differences in the amount and characteristics of sludge and tried to relate them to specific technological systems in use at the treatment plants. The paper mainly focuses on heavy metals removed from the water and then trapped in the sludge. The aim of the work was to describe changes that involved both the quantity of sludge and its characteristics, especially with respect to its further disposal (e.g. heavy metals, etc.). Additionally, some aspects of an activated carbon dosing regime and its impact on a heavy metal content in sludge were discussed.

Słowa kluczowe: sludge processing, water treatment, sludge disposal, sustainable development
References

Balcerzak W., Rybicki S.M., Kaszowski J., Dewatering of sludge produced in the process of purification of surface water on the example of the aqueduct Raba (In Polish), Environmental Protection, 3/2007, 65-68.

Bürger R., Concha F., Tiller F.M., Applications of the phenomenological theory to several published experimental cases of sedimentation processes, Chem. Eng. J., 80, 2000, 105-118.

de Kretser R.G., Usher S.P., Scales P.J., Boger D.V., Landman K.A., Rapid filtration measurement of dewatering design and optimization parameters, AIChE J., 47, Issue 8, 2001, 1758-1769.

Grey N.F., Water Technology, IWA Publishing, Elsevier, 2010, 745 pages.

Jarvis P., Jefferson B., Parsons S.A., Characterizing natural organic matter flocs, Water Science and Technology: Water Supply, 4 (4), 2004, 79-87.

Landman K.A., White L.R., Solid/liquid separation of flocculated suspensions, Advances in Colloid and Interface Science, 51, 1994, 175-246.

Landman K.A., White L.R., Predicting filtration time and maximizing throughput in a pressure filter, AIChE Journal, 43, Issue 12, 1997, 3147-3160.

Postawa A., Witczak, S. (eds.), Metals and accompanying substances in water intended for human consumption in Poland (In Polish), AGH Publishing, 2011, 365 pages.

Rak J.R., Kucharski B., Sludge management in water treatment plants, Environment Protection Engineering, 35, Issue 2, 2009, 15-21.

Rybicki S.M., Cimochowicz-Rybicka M., Dimensioning of digestion chamber for upgrading of gas recovery at Wastewater Treatment Plant, Archives of Environmental Protection, 4, 2013, 105-112.

Rybicki S.M., Kurbiel J., Energy saving by retrofitting WWTP from aerobic stabilisation of wasted activated sludge to anaerobic digestion – case study, Proc. of a Polish-Swedish Seminar, Joint Polish Swedish Reports, Report No. 7, Stockholm.

Sozański M.M., Leszczynska M., Physico-Chemical Composition of Water Treatment Sludge with Special Regard to the Toxic Substances, Inżynieria i Ochrona Środowiska, 4, 2001, 197-206.

Journal of Laws, Republic of Poland (2002) 134.1140.