ORIGINAL RESEARCH
The Effect of Anionic Surfactant Concentration
on Activated Sludge Condition and Phosphate
Release in Biological Treatment Plant
Alina Dereszewska1, Stanisław Cytawa2, Renata Tomczak-Wandzel3,
Krystyna Medrzycka4
1Department of Chemistry and Industrial Commodity Science, Gdynia Maritime University,
Morska 83, 81-225 Gdynia, Poland
2‘Swarzewo’ Wastewater Treatment Plant, Władysławowska 84, 84-120 Władysławowo, Poland
3Aquateam COWI AS, Hasleveien Str. 10, 0571 Oslo, Norway
4Chemical Faculty, Gdansk University of Technology (GUT), Narutowicza 11/12, 80-233 Gdańsk, Poland
Morska 83, 81-225 Gdynia, Poland
2‘Swarzewo’ Wastewater Treatment Plant, Władysławowska 84, 84-120 Władysławowo, Poland
3Aquateam COWI AS, Hasleveien Str. 10, 0571 Oslo, Norway
4Chemical Faculty, Gdansk University of Technology (GUT), Narutowicza 11/12, 80-233 Gdańsk, Poland
Submission date: 2014-05-28
Final revision date: 2014-07-29
Acceptance date: 2014-08-03
Publication date: 2015-02-06
Pol. J. Environ. Stud. 2015;24(1):83–91
KEYWORDS
activated sludge; anionic surfactant, phosphorous release; respirometric activityactivated sludgeanionic surfactantphosphorous releaserespirometric activity
TOPICS
ABSTRACT
This paper discusses the influence of a wide range of anionic surfactant concentrations on activated
sludge. Linear alkylbenzene sulphonate (LAS) was chosen as an example of a commonly used anionic surfactant.
The fate of the surfactant during biological treatment of wastewater was tested. The effect of surfactant
on glucose and starch removal was studied. It has been found that in the case of glucose the removal was
independent of LAS concentration, while in the case of starch it was incomplete at high surfactant loads (above
15 mg·(g·dss)-1). The study established that surfactants can activate or inhibit microorganism activity, depending
on surfactant concentration. LAS loads up to 3 mg·(g·dss)-1 positively stimulate the removal of COD, phosphorus
release and the respirometric activity of the sludge. LAS loads higher than 15 mg·(g·dss)-1 inhibit respiration
of activated sludge bacteria and decrease phosphorus removal. It also affects the morphology of activated
sludge flocs, causing their fragmentation and lysis of protozoa cells.
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