Optimization of Nutrients and Metals Release from Municipal Sewage Sludge by Chemical Extraction using Box-Behnken Design

Autor:	Ayla Uysal, Dilara Tuncer
Rok vydání:	2017
Předmět:	Dewatered sludge Atmospheric Science Global and Planetary Change Waste management chemistry.chemical_element Municipal sewage Zinc Management Monitoring Policy and Law Box–Behnken design chemistry.chemical_compound Anaerobic digestion Nutrient chemistry Citric acid Nuclear chemistry
Zdroj:	International Journal of Global Warming. 11:1
ISSN:	1758-2091 1758-2083
DOI:	10.1504/ijgw.2017.10001248
Popis:	In this study, H2SO4 and citric acid using Box-Behnken design were utilised in order to release the nutrients and metals fixed in the anaerobic digested and dewatered sludge. For the dewatered sludge, release of 16.27 mg/L P and 120.74 mg/L NH4+ were obtained at optimised conditions with citric acid 0.3 M, H2SO4 6% and reaction time 105 min, respectively. For the digested sludge, release of 764.1 mg/L P and 388.3 mg/L NH4+ were achieved at optimised conditions with citric acid 0.1 M, H2SO4 6% and reaction time 180 min, respectively. In all experimental conditions, Fe and Zn were released together with nutrients. For digested sludge, a minimum Fe and Zn release was achieved at optimised conditions with citric acid 0.5 M, H2SO4 2% and reaction time 105 min, respectively. Thus, this test conditions are thought to be more appropriate for the nutrients recovery from digested sludge.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::46beebae96009e59f8902cb6c83f2768 https://doi.org/10.1504/ijgw.2017.10001248 Zobrazit plný text záznamu