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Effects of substrate COD/NO2−-N ratio on simultaneous methanogenesis and short-cut denitrification in the treatment of blue mussel using acclimated sludge

Paper ID Volume ID Publish Year Pages File Format Full-Text
2922 143 2015 8 PDF Available
Title
Effects of substrate COD/NO2−-N ratio on simultaneous methanogenesis and short-cut denitrification in the treatment of blue mussel using acclimated sludge
Abstract

•Studied the combined methanogenesis and short-cut denitrification in batch reactors.•Employed blue mussels, discharged worldwide in vast quantities, as solid substrate.•Discussed the effects of COD/NO2−-N ratio in substrate and NO2−-acclimated sludge.•Observed comparable methanogenic performance to other studies of liquid substrates.•Using NO2− acclimated sludge promoted both denitrifying and methanogenic activities.

Simultaneous methanogenesis and short-cut denitrification processes have attracted attention because it enables the removal of organic matter and nitrogen in a same reactor. In this study, these processes were applied to the treatment of blue mussels, which are discharged worldwide intermittently and in vast quantities as organic solid waste. The effects of substrate COD/NO2−-N ratios on denitrifying and methanogenic performances were evaluated in batch experiments. NO2− acclimated sludge was used as a part of seed sludge to enhance the tolerance to NO2−. Two acclimated sludges were obtained by two-different acclimating conditions which exposed to influent COD/NO2−-N ratios of 25 with high COD loading rate and 5 with low COD loading rate during acclimation periods (referred to as AS25 and AS5). AS25 added reactors showed the relatively high methanogenic and denitrifying performances compared to AS5 added reactors. The results obtained in AS25 added reactors showed comparable results to different studies which used liquid substrates. High COD and NO2− removal efficiencies were achieved under substrate COD/NO2−-N ratio ranging from 8.6 to 123, representing the successful performance for the treatment of blue mussels which contains COD/N ratio of 16.3 in their tissue.

Keywords
Methanogenesis; Short-cut denitrification; Simultaneous process; Sludge acclimation; COD/NO2−-N ratio; Marine biofouling organisms
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Effects of substrate COD/NO2−-N ratio on simultaneous methanogenesis and short-cut denitrification in the treatment of blue mussel using acclimated sludge
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 99, 15 July 2015, Pages 16–23
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us