Document Type : Research Paper
Chem Eng Dept, Ege University
ITOB-OSB, Tekeli-Menderes, İzmir, Turkey
Süleyman Demirel University, Environmental Engineering Department, Isparta, Turkey
Ege University, Chemical Engineering Department, İzmir, Turkey
In this study, eﬀect of antiscalant usage on minimizing of membrane fouling due to high water hardness during wastewater treatment tests run by a pilot-scale membrane bioreactor (MBR) system. The membranes used in these studies were Kubota ﬂat sheet MBR membranes made from polyethylene with a pore size of 0.4 micrometer. Preliminary tests were carried out with tap water for sixty days of operation. To investigate the applicability and the eﬀect of antiscalant usage, four experiments (two experiments with tap water and two experiments with wastewater) were carried out and each experiment lasted for 29 days. The tests were carried out in the presence and in the absence of antiscalant. Fouling on MBR membranes was investigated by monitoring ﬂux decline versus time. In tap water tests, unstable ﬂux was observed initially then a ﬂux decline due inorganic scaling. On the other hand, the ﬂux was almost constant up to end of the experiment in the presence of antiscalant. During wastewater tests (in the absence of antiscalant), the ﬂux decline was observed within ten days of operation while during wastewater tests in presence of antiscalant, the ﬂux did not decline until twenty days of operation. The use of antiscalant did not inﬂuence
the efuent quality. According to the quality analyses results for MBR efuent, removal efciencies for COD, PO4-P, and total N were 95%, 98% and 40%, respectively. In addition,
99% of total suspended solid rejection and 98% of color rejection were obtained in the presence or absence of antiscalant.