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CONSIDERATIONS REGARDING RESIDUALS MANAGEMENT IN WATER TREATMENT
Abstract
Wastewater treatment plants produce large quantities of sludge. Sludge originates from different stages of treatment and typically contains elevated levels of heavy metals, a large number of organic compounds and potentially pathogenic organisms. Considering the recent increased environmental concern, the authorities and the water utilities are facing strong demands for the safe disposal of the sludge. A good management plan regarding water treatment residuals should take into consideration the following aspects: the quality characteristics of the sludge, the technologies of processing residuals and the available disposal options. The paper is structured on several sub-chapters. First, an introduction into the subject of wastewater residuals is made and the related legislative framework is reviewed. Then, two case studies from wastewater treatment plants from Romania are presented. In both cases, the technologies of residual processing are presented together with data regarding sludge quality characteristics. Finally, an analysis on the optimization of sludge disposal methods is made and a management strategy is proposed.
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References7
Iacob C., Deac A., Chira T., Bolboacă A., Study on optimizing the operation of a wastewater treatment plant in Romania, Int. M. Scient. Geoconf. SGEM 18,Viena, 2018, pp 477-484;
Direcția generală AM POS Mediu, Strategia națională de gestionare a nămolurilor de epurare (București), 2012;
https://ec.europa.eu/environment/waste/sludge/;
Water Law no. 107/1996 (with additions and modifications by Law no. 310/2004, Law no. 112/2006, GEO no. 12/2007, GEO 3/2010, GEO 64/2011, GEO 71/2011, Law 187/2012, GEO 69/2013, Law 153/2014, Law 196/2015);
Law no. 211/2011 regarding waste management;
GD no. 188/2002 enforcing norms related to conditions for wastewater discharge into aquatic environment (NTPA 001/2002; 002/2002; 011/2002) modified by GD 352/2005 (NTPA 001/2005; 002/2002; 011/2005) and GD no. 210/2007, GD no. 349/2005 regarding waste storage, modified by GD no. 210/2007 and GD no. 1292/2010;
GEO no. 195/2005 regarding environment protection, with additions and modifications by Law no. 265/2006 , GEO no. 114/2007, Law 226/2013 and GEO 164/2008.
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