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Strengthening aerobic granule by salt precipitation

Author:
Chen, Yu-You, Pan, Xiangliang, Li, Jun, Lee, Duu-Jong
Source:
Bioresource technology 2016 v.218 pp. 1253-1256
ISSN:
0960-8524
Subject:
calcium carbonate, calcium sulfate, cost effectiveness, granules, magnesium carbonate, organic matter, pH, silica, tricalcium phosphate, ultrasonics, wastewater treatment
Abstract:
Structural stability of aerobic granules is generally poor during long-term operation. This study precipitated seven salts inside aerobic granules using supersaturated solutions of (NH4)3PO4, CaCO3, CaSO4, MgCO3, Mg3(PO4)2, Ca3(PO4)2 or SiO2 to enhance their structural stability. All precipitated granules have higher interior strength at ultrasonic field and reveal minimal loss in organic matter degradation capability at 160-d sequential batch reactor tests. The strength enhancement followed: Mg3(PO4)2=CaSO4>SiO2>(NH4)3PO4>MgCO3>CaCO3=Ca3(PO4)2>original. Also, the intra-granular solution environment can be buffered by the precipitate MgCO3 to make the aerobic granules capable of degradation of organic matters at pH 3. Salt precipitation is confirmed a simple and cost-effective modification method to extend the applicability of aerobic granules for wastewater treatments.
Agid:
5247057