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Recovery of struvite via coagulation and flocculation using natural compounds

Latifian, Maryam LU ; Liu, Jing LU and Mattiasson, Bo LU (2014) In Environmental Technology 35(18). p.2289-2295
Abstract
One of the major setbacks of struvite recovery processes is the difficulty in harvesting struvite crystals. This study evaluates the use of different coagulants to improve precipitation of struvite (MgNH (4)PO(4)6H(2)O) crystals. Chitosan and poly(diallyldimethyl ammonium chloride) (Poly-DADMAC) as a coagulant-flocculent and alginate and bentonite as a coagulant aid have been examined in jar tests. Also, a continuous three-phase process, i.e. struvite crystallization, coagulation/flocculation and precipitation process, was set up for real wastewater. Addition of chitosan as the coagulant and bentonite as the coagulant aid was significantly more efficient in forming struvite flocs in comparison to Poly-DADMAC alone or with coagulant aid,... (More)
One of the major setbacks of struvite recovery processes is the difficulty in harvesting struvite crystals. This study evaluates the use of different coagulants to improve precipitation of struvite (MgNH (4)PO(4)6H(2)O) crystals. Chitosan and poly(diallyldimethyl ammonium chloride) (Poly-DADMAC) as a coagulant-flocculent and alginate and bentonite as a coagulant aid have been examined in jar tests. Also, a continuous three-phase process, i.e. struvite crystallization, coagulation/flocculation and precipitation process, was set up for real wastewater. Addition of chitosan as the coagulant and bentonite as the coagulant aid was significantly more efficient in forming struvite flocs in comparison to Poly-DADMAC alone or with coagulant aid, which did not show any positive effect. The calculated average settling velocity of struvite with chitosan-bentonite addition in synthetic and in real wastewater increased by approximately 5.3 and 2.8 folds, respectively, compared with that of no coagulant/flocculent addition. Phosphorus recovery of over 70% was achieved by the continuous process. Findings in this study clearly confirmed the possibility of using chitosan and bentonite as an efficient coagulant-flocculent to enhance the recovery of struvite crystals. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
struvite, coagulation, phosphorus recovery, chitosan, bentonite, municipal wastewater
in
Environmental Technology
volume
35
issue
18
pages
2289 - 2295
publisher
Selper Ltd
external identifiers
  • wos:000336432700004
  • scopus:84901480658
ISSN
1479-487X
DOI
10.1080/09593330.2014.902110
language
English
LU publication?
yes
id
4fdbf2dc-e69e-484e-a255-89ed58bd8bde (old id 4558648)
date added to LUP
2014-07-17 12:38:51
date last changed
2017-07-09 03:22:14
@article{4fdbf2dc-e69e-484e-a255-89ed58bd8bde,
  abstract     = {One of the major setbacks of struvite recovery processes is the difficulty in harvesting struvite crystals. This study evaluates the use of different coagulants to improve precipitation of struvite (MgNH (4)PO(4)6H(2)O) crystals. Chitosan and poly(diallyldimethyl ammonium chloride) (Poly-DADMAC) as a coagulant-flocculent and alginate and bentonite as a coagulant aid have been examined in jar tests. Also, a continuous three-phase process, i.e. struvite crystallization, coagulation/flocculation and precipitation process, was set up for real wastewater. Addition of chitosan as the coagulant and bentonite as the coagulant aid was significantly more efficient in forming struvite flocs in comparison to Poly-DADMAC alone or with coagulant aid, which did not show any positive effect. The calculated average settling velocity of struvite with chitosan-bentonite addition in synthetic and in real wastewater increased by approximately 5.3 and 2.8 folds, respectively, compared with that of no coagulant/flocculent addition. Phosphorus recovery of over 70% was achieved by the continuous process. Findings in this study clearly confirmed the possibility of using chitosan and bentonite as an efficient coagulant-flocculent to enhance the recovery of struvite crystals.},
  author       = {Latifian, Maryam and Liu, Jing and Mattiasson, Bo},
  issn         = {1479-487X},
  keyword      = {struvite,coagulation,phosphorus recovery,chitosan,bentonite,municipal wastewater},
  language     = {eng},
  number       = {18},
  pages        = {2289--2295},
  publisher    = {Selper Ltd},
  series       = {Environmental Technology},
  title        = {Recovery of struvite via coagulation and flocculation using natural compounds},
  url          = {http://dx.doi.org/10.1080/09593330.2014.902110},
  volume       = {35},
  year         = {2014},
}