TY - JOUR A1 - Petzet, S. A1 - Peplinski, Burkhard A1 - Bodkhe, S.Y. A1 - Cornel, P. T1 - Recovery of phosphorus and aluminium from sewage sludge ash by a new wet chemical elution process (SESAL-phos-recovery process) JF - Water science and technology N2 - The potential of a new wet chemical process for phosphorus and aluminium recovery from sewage sludge ash by sequential elution with acidic and alkaline solutions has been investigated: SESAL-Phos (sequential elution of sewage sludge ash for aluminium and phosphorus recovery). Its most innovative aspect is an acidic pre-treatment step in which calcium is leached from the sewage sludge ash. Thus the percentage of alkaline soluble aluminium phosphates is increased from 20 to 67%. This aluminium phosphate is then dissolved in alkali. Subsequently, the dissolved phosphorus is precipitated as calcium phosphate with low heavy metal content and recovered from the alkaline solution. Dissolved aluminium is recovered and may be reused as a precipitant in wastewater treatment plants. KW - Aluminium phosphate KW - Calcium phosphate KW - Phosphorus recovery KW - Sewage sludge ash PY - 2011 DO - https://doi.org/10.2166/wst.2011.682 SN - 0273-1223 VL - 64 IS - 3 SP - 693 EP - 699 PB - IWA Publishing CY - Bristol AN - OPUS4-24244 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Petzet, S. A1 - Peplinski, Burkhard A1 - Cornel, P. T1 - On wet chemical phosphorus recovery from sewage sludge ash by acidic or alkaline leaching and an optimized combination of both JF - Water research N2 - The advantages and drawbacks of existing wet chemical phosphorus (P) recovery technologies, their applicability to different types of sewage sludge ash (SSA) and the role of the decay products of detergent zeolites as a source of reactive Al in SSA are analyzed. Since neither a purely acidic nor a purely alkaline treatment are able to provide satisfactory technical solutions a wet chemical phosphorus (P) recovery process for sewage sludge ashes (SSAs) is investigated in detail that is based on a sequential treatment of SSA with an acid and a base. As a result of an acidic pre-treatment, the P fraction of the raw SSA that was bound as – alkaline-insoluble – calcium phosphate (Ca–P) is converted into aluminum phosphate (Al–P). This newly formed Al–P can be easily dissolved via alkaline treatment and then easily separated from the alkaline leachate via precipitation of Ca–P. The Al-component can be reused as precipitant for P-removal in waste water treatment plants (WWTPs). The investigated process requires fewer chemicals than the direct acidic dissolution of all P-compounds contained in the SSA. This is due to the described rearrangement of the P component from Ca–P to Al–P. That such a rearrangement of P occurs indeed was confirmed through a combination of XRD, ICP and XRF analyses together with mass balance calculations. The present investigation proves that the process works for very different types of SSAs: For Al-rich SSAs that come from WWTPs where Al-salt is used for chemical P-removal the described sequential treatment process works best and yields P-recovery rates as high as 70–77%. But even for SSAs from WWTPs where only iron salt is used for chemical P-removal, a considerable amount of the reactive Al necessary for the described P-rearrangement is supplied by decay products of detergent zeolites, a hidden Al-source present in most SSAs produced in Europe. KW - Phosphorus recovery KW - Sewage sludge ash KW - Alkaline and acidic leaching KW - Calcium phosphate KW - Aluminum phosphate KW - Detergent zeolites KW - XRD analysis PY - 2012 DO - https://doi.org/10.1016/j.watres.2012.03.068 SN - 0043-1354 VL - 46 IS - 12 SP - 3769 EP - 3780 PB - Elsevier CY - Amsterdam AN - OPUS4-26005 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Petzet, S. A1 - Peplinski, Burkhard A1 - Bodkhe, S.Y. A1 - Connel, P. T1 - Phosphorus and Aluminium Recovery from Sewage Sludge Ash by a novel two Step wet chemical Elution Process (SESAL-Phos - Recovery Process) T2 - Nutrient Recovery and Management Conference (International Water Association) T2 - Nutrient Recovery and Management Conference (International Water Association) CY - Miami, FL, USA DA - 2011-01-09 PY - 2011 AN - OPUS4-22902 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -