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Recovery of Phosphorus and Nitrogen from Domestic Wastewater through Struvite Precipitation using Conical Fluidized Bed Reactor

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dc.contributor.advisor Agizew, Nigussie (PhD)
dc.contributor.advisor Zerihun, Getaneh (Mr.) Co-Advisor
dc.contributor.author Azeb, Wujira
dc.date.accessioned 2020-03-05T10:17:56Z
dc.date.available 2020-03-05T10:17:56Z
dc.date.issued 2019-10
dc.description.abstract Recovery of nutrients as struvite before it forms and accumulates is in line with sustainable wastewater management. It prevents water pollution and enables use of the nutrients as fertilizer to increase agricultural productivity. A bench-scale fluidized bed reactor (FBR) was used to recover phosphate (PO4) and ammonium (NH4) through struvite crystallization, from synthetic wastewater and aerobic digester domestic wastewater supernatant collected from, Haile Garment Addis Ababa and Oromia Condominium Wastewater Treatment Plant. Struvite crystallization is a promising nutrient recovery method. Its recovered precipitate can be used as a slow release fertilizer and raw material for chemical industry. The objective of this research was to examine the influence of different parameters affecting the performance of FBR for phosphorus (P) and nitrogen (N) removal and recovery efficiencies. In this study, the impacts of important factors on nutrient recovery in a laboratory scale (FBR) were examined using synthetic wastewater to get optimal values. The nutrient recovery of the FBR from real wastewater was also evaluated by using the optimum parameter values. The recoveries of PO4 and NH4 were evaluated by changing the values of the following parameters: pH (7.5-10), molar ratio of Mg/P (0.75-1.75), Hydraulic retention time (HRT = 15hr), and settling time (15-90min). The optimum values of pH, Mg/P, HRT, and settling time were found to be 9, 1.5:1, 2hr, and 30min respectively. Under these optimum values, the P and N removal efficiencies of conical FBR from synthetic and real wastewater were 97% and 95% and 67.2% and 64.7%, respectively. Moreover, different techniques were used to enhance nutrient recovery efficiency including use of a reactor that has three parts and insertion of cones in each part. The findings of the study show pH, Mg/P molar ratio, HRT, and settling time to be important factors that influence Phosphorus and nitrogen removal efficiency in FBR. A conical FBR with three distinct parts gives a good nutrient recovery through struvite precipitation. en_US
dc.language.iso en_US en_US
dc.publisher Addis Ababa University en_US
dc.subject Efficiency en_US
dc.subject fluidized bed reactor en_US
dc.subject Recovery en_US
dc.subject Removal en_US
dc.subject Struvite en_US
dc.subject nutrient en_US
dc.subject wastewater en_US
dc.title Recovery of Phosphorus and Nitrogen from Domestic Wastewater through Struvite Precipitation using Conical Fluidized Bed Reactor en_US
dc.type Thesis en_US

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