Analysis of samples and anaerobic biodegradability of sludges from Jurong and Ulu Pandan water reclamation plants (WRPs) (Report 6)

Ng, Wun Jern and Trzcinski, Antoine P. ORCID: and Ganda, Lily (2014) Analysis of samples and anaerobic biodegradability of sludges from Jurong and Ulu Pandan water reclamation plants (WRPs) (Report 6). Project Report. Unpublished . [Report]


This report is the sixth quarterly progress report (date: 31st October 2014) in this two-year project (starting date: 12th August 2013). The analysis of 61 sludge samples from a pilot plant in Jurong WRP (consisting of 57 samples from the clarifier and 4 samples from the biosorption column, respectively) had been completed since March 2014. Subsequently, the work has focused on samples from Ulu Pandan WRP.

The sludge samples of Ulu Pandan WRP are collected from an integrated validation plant (IVP), a pilot study implementing an A-B process with the A-stage primarily comprising a biosorption tank (BPT) and the B-stage consisting of a membrane bioreactor (MBR) system. A total of 69 samples (consisting of 34 samples from the clarifier placed after the biosorption step, henceforth referred to as BPT, and 35 samples from the MBR, respectively) have been received to date. The contents of solids (TS, VS, TSS, and VSS) and COD of these sludge samples are presented in Figures 1 and 2, respectively. High fluctuation of solid and COD compositions was observed from BPT samples while more relatively constant compositions were obtained from MBR samples. Both sludge samples collected on 25th September showed an exceptionally high fixed-solid content, which is possibly caused by chemical precipitation.

Results of biodegradability tests and calorific measurements for both sludges are shown in Figure 3. Greater variations in the biodegradability as well as calorific value were obtained from BPT sludge (calorific value: 10,000-22,000 J/g TS; biodegradability: 250-775 mL CH4/g VS) as compared to those of MBR sludge (calorific value: 15,000-20,000 J/g TS; biodegradability: 150-400 mL CH4/g VS). These findings could be attributed by higher dynamics in the solids composition (fixed solid/volatile solid ratio) of BPT sludge as indicated above. Additionally, BPT sludge demonstrated higher biodegradability than the MBR sludge (refer to Figure 4).

After anaerobic digestion step, the centrate was analyzed for its C-N-P content. No significant difference in centrate characteristics was obtained from the two samples. The typical ranges for SCOD, TN, and TP are 50-200 mg COD/L, 300-600 mg NH4+-N/L, and 100-250 mg PO43--P, respectively.

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Item Type: Report (Project Report)
Item Status: Live Archive
Additional Information: Unpublished report.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 30 Jul 2018 05:55
Last Modified: 11 Mar 2019 01:05
Uncontrolled Keywords: wastewater treatment plants
Fields of Research (2008): 09 Engineering > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes
09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Fields of Research (2020): 40 ENGINEERING > 4004 Chemical engineering > 400410 Wastewater treatment processes
40 ENGINEERING > 4011 Environmental engineering > 401102 Environmentally sustainable engineering
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering

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