The inhibitory effect of inorganic carbon on phosphate recovery from upflow anaerobic sludge blanket reactor (UASB) effluent as calcium phosphate-Reference-Cited by-同舟云学术

The inhibitory effect of inorganic carbon on phosphate recovery from upflow anaerobic sludge blanket reactor (UASB) effluent as calcium phosphate

Published:2018-12-29 Issue:12 Volume:78 Page:2608-2615
ISSN:0273-1223
Container-title:Water Science and Technology
language:en
Short-container-title:

Author:

Monballiu A.¹,Desmidt E.¹,Ghyselbrecht K.¹,Meesschaert B.¹

Affiliation:

1. Laboratory for Microbial and Bio-Chemical Technology, Cluster for Bio-engineering, Faculty of Engineering Technology, KU Leuven Bruges Campus, Spoorwegstraat 12, 8200 Brugge, Belgium

Abstract

Abstract After treatment of the wastewater from the potato processing industry in an upflow anaerobic sludge blanket reactor (UASB) the effluent is rich in phosphate and dissolved inorganic carbon (IC). Increasing the pH of the UASB effluent with NaOH to precipitate phosphate as calcium phosphate leads to contamination with magnesium phosphate. Increasing the pH with Ca(OH)2 had a positive effect on phosphate precipitation, but after increasing the pH with Na2CO3 no precipitate was formed. After prior nitrification of the UASB effluent to remove IC, less NaOH was needed to increase the pH and the ions precipitated in a ratio that agreed with calcium phosphate formation. When the pH of the nitrified effluent was increased with Na2CO3 neither calcium nor phosphate precipitated. This inhibitory effect of IC on phosphate precipitation as calcium phosphate could not be derived from the saturation indexes calculated by the geochemical modelling program PHREEQC.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

Link

http://iwaponline.com/wst/article-pdf/78/12/2608/525300/wst078122608.pdf

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