Premium
Lecane tenuiseta rotifers improves activated sludge settleability in laboratory scale SBR system at 13°C and 20°C
Author(s) -
KocerbaSoroka Wioleta,
Fiałkowska Edyta,
PajdakStós Agnieszka,
Sobczyk Mateusz,
Starzycka Joanna,
Fyda Janusz
Publication year - 2017
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12220
Subject(s) - activated sludge , effluent , segmented filamentous bacteria , chemical oxygen demand , settling , bioreactor , sequencing batch reactor , nutrient , biology , bacteria , chemistry , pulp and paper industry , environmental engineering , environmental chemistry , ecology , environmental science , wastewater , botany , genetics , engineering
Two experiments at different temperatures were conducted in five laboratory‐scale bioreactors with enhanced nutrient removal simulating the work of sequencing batch reactors (SBRs). The process was operated in three 8‐hour cycles. The oxygen concentration, pH and temperature were controlled and maintained at 1 mg of O 2 /L, 7 and 13°C, respectively, throughout the first two weeks and at 20°C for the next 10 days. The introduction of Lecane tenuiseta improved the settling properties of the activated sludge dominated by Microthrix parvicella at both temperatures tested. L. tenuiseta rotifers led to a reduction in filamentous bacteria abundance and did not negatively affect the chemical parameters of the effluent. For each temperature, there were no differences in COD, N tot , N‐NH 4 or P‐PO 4 values between the treatment and control bioreactors. The results have shown that the application of L. tenuiseta is a promising biological tool for bulking prevention especially in a cold season.