Resumé

Acidification was used to dissolve phosphorus from digested and non-digested sludge from five wastewater treatment plants in order to make phosphorus accessible for subsequent recovery. More phosphorus was dissolved from digested sludge (up to 80%), with respect to non-digested sludge (∼25%) and the highest release was observed at pH 2. The acid consumption for digested sludge was higher than for non-digested sludge due to the presence of the bicarbonate buffer system, thus CO 2 stripping increased the acid consumption. In all the experiments, the sludge was exposed to acid for 1 h. For the five tested sludge types, 60–100 mmol o-P was released per added mol H 2SO 4. It was mainly iron and calcium compounds that accounts for the phosphorus release at low pH. The release of heavy metals was in general low (<30%) for all the wastewater treatment plant, as Zn, Cd and Ni showed the most critical release after acidification of non-digested sludge.

OriginalsprogEngelsk
TidsskriftWater Research
Vol/bind146
Sider (fra-til)307-317
Antal sider11
ISSN0043-1354
DOI
StatusUdgivet - 1 dec. 2018

Fingerprint

Acidification
acidification
Phosphorus
sludge
phosphorus
Recovery
Wastewater treatment
Acids
Calcium compounds
Iron compounds
acid
Heavy metals
bicarbonate
calcium
heavy metal
iron
Experiments
experiment

Citer dette

@article{1749dda1479f4d63b950594e08c32a71,
title = "Acidification and recovery of phosphorus from digested and non-digested sludge",
abstract = "Acidification was used to dissolve phosphorus from digested and non-digested sludge from five wastewater treatment plants in order to make phosphorus accessible for subsequent recovery. More phosphorus was dissolved from digested sludge (up to 80{\%}), with respect to non-digested sludge (∼25{\%}) and the highest release was observed at pH 2. The acid consumption for digested sludge was higher than for non-digested sludge due to the presence of the bicarbonate buffer system, thus CO 2 stripping increased the acid consumption. In all the experiments, the sludge was exposed to acid for 1 h. For the five tested sludge types, 60–100 mmol o-P was released per added mol H 2SO 4. It was mainly iron and calcium compounds that accounts for the phosphorus release at low pH. The release of heavy metals was in general low (<30{\%}) for all the wastewater treatment plant, as Zn, Cd and Ni showed the most critical release after acidification of non-digested sludge.",
keywords = "Acidification, Heavy metals, Phosphorus, Sludge",
author = "Quist-Jensen, {Cejna Anna} and Lisbeth Wybrandt and Hanne L{\o}kkegaard and Sebastian Antonsen and Jensen, {Henriette Casper} and Nielsen, {Asbj{\o}rn Haaning} and Christensen, {Morten Lykkegaard}",
year = "2018",
month = "12",
day = "1",
doi = "10.1016/j.watres.2018.09.035",
language = "English",
volume = "146",
pages = "307--317",
journal = "Water Research",
issn = "0043-1354",
publisher = "I W A Publishing",

}

Acidification and recovery of phosphorus from digested and non-digested sludge. / Quist-Jensen, Cejna Anna; Wybrandt, Lisbeth; Løkkegaard, Hanne; Antonsen, Sebastian; Jensen, Henriette Casper; Nielsen, Asbjørn Haaning; Christensen, Morten Lykkegaard.

I: Water Research, Bind 146, 01.12.2018, s. 307-317.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Acidification and recovery of phosphorus from digested and non-digested sludge

AU - Quist-Jensen, Cejna Anna

AU - Wybrandt, Lisbeth

AU - Løkkegaard, Hanne

AU - Antonsen, Sebastian

AU - Jensen, Henriette Casper

AU - Nielsen, Asbjørn Haaning

AU - Christensen, Morten Lykkegaard

PY - 2018/12/1

Y1 - 2018/12/1

N2 - Acidification was used to dissolve phosphorus from digested and non-digested sludge from five wastewater treatment plants in order to make phosphorus accessible for subsequent recovery. More phosphorus was dissolved from digested sludge (up to 80%), with respect to non-digested sludge (∼25%) and the highest release was observed at pH 2. The acid consumption for digested sludge was higher than for non-digested sludge due to the presence of the bicarbonate buffer system, thus CO 2 stripping increased the acid consumption. In all the experiments, the sludge was exposed to acid for 1 h. For the five tested sludge types, 60–100 mmol o-P was released per added mol H 2SO 4. It was mainly iron and calcium compounds that accounts for the phosphorus release at low pH. The release of heavy metals was in general low (<30%) for all the wastewater treatment plant, as Zn, Cd and Ni showed the most critical release after acidification of non-digested sludge.

AB - Acidification was used to dissolve phosphorus from digested and non-digested sludge from five wastewater treatment plants in order to make phosphorus accessible for subsequent recovery. More phosphorus was dissolved from digested sludge (up to 80%), with respect to non-digested sludge (∼25%) and the highest release was observed at pH 2. The acid consumption for digested sludge was higher than for non-digested sludge due to the presence of the bicarbonate buffer system, thus CO 2 stripping increased the acid consumption. In all the experiments, the sludge was exposed to acid for 1 h. For the five tested sludge types, 60–100 mmol o-P was released per added mol H 2SO 4. It was mainly iron and calcium compounds that accounts for the phosphorus release at low pH. The release of heavy metals was in general low (<30%) for all the wastewater treatment plant, as Zn, Cd and Ni showed the most critical release after acidification of non-digested sludge.

KW - Acidification

KW - Heavy metals

KW - Phosphorus

KW - Sludge

UR - http://www.scopus.com/inward/record.url?scp=85054299016&partnerID=8YFLogxK

U2 - 10.1016/j.watres.2018.09.035

DO - 10.1016/j.watres.2018.09.035

M3 - Journal article

VL - 146

SP - 307

EP - 317

JO - Water Research

JF - Water Research

SN - 0043-1354

ER -