Sewage sludge treatment with biomass ash for its agricultural use

• Published in: WASTES: Solutions, Treatments and Opportunities IV pp. 57 - 62
• Main Authors: Davó-Sarrión, A., Grau-Saénz, M., Caballero-Cascales, T., Paredes, C.
• Format: Book Chapter
• Language: English
• Published: United Kingdom CRC Press 2023; Taylor & Francis Group
• Edition: 1
• Subjects: SS; SS Treatment; Organic Amendment; Raphanus Sativus; SS Dewatering; Dry Weight Basis; Heavy Metal Availability; Loamy Texture; Heavy Metal Bioavailability; Heavy Metal Content; Unamended Soil; CFU; Aerobic Biological Process; Highest Total Nitrogen Contents; Urban Wastewater Treatment Plant; Dry Matter; Hydrated Lime; Soil Incubation Experiment; Moisture Content; Highest Ca Concentrations; Low Nitrogen Content; Equivalent CaCO; BA; Higher Dry Matter Content
• ISBN: 1032384417; 9781032384429; 1032384425; 9781032384412
• DOI: 10.1201/9781003345084-10

We determined the adequate dose of biomass ash (BA) (30, 50, 100 and 150 % (w/w, on dry weight basis)) for the treatment of a sewage sludge (SS) and the effect of BA treated SS on soil properties and survival of radish seedlings compared to SS treated with hydrated lime (SS-Lime). The results obtained showed that the use of BA for SS conditioning was more effective for SS dewatering and sanitising than SS-Lime. In addition, the high K content of the BA increased the fertilising value of the SS-BA mixtures and none of these mixtures had a heavy metal content above the maximum levels allowed. Furthermore, the most suitable dose of ash for the agricultural use of the SS-BA mixture was 30%, since with this treatment the highest survival of radish seedlings and the notable increase in the available K and P contents of the soil were achieved.