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    Use of pH as Control Parameter for Aerobic/Anoxic Sludge Digestion

    Source: Journal of Environmental Engineering:;1995:;Volume ( 121 ):;issue: 003
    Author:
    Ibrahim Al-Ghusain
    ,
    Oliver J. Hao
    DOI: 10.1061/(ASCE)0733-9372(1995)121:3(225)
    Publisher: American Society of Civil Engineers
    Abstract: Alternating aerobic/anoxic (A/A) digestion of waste activated sludge offers many advantages over traditional (aerobic or anaerobic digestion) methods. However, one of the main concerns in A/A digestion is the development of an on-line control strategy for alternating aerobic and anoxic cycles. Computerized pH monitoring has revealed two well-defined control points that correspond to complete nitrification (ammonia valley) and denitrification (nitrate apex). The pH control points were consistent with those previously identified using the oxidation reduction potential. Based on these findings, two real-time control strategies were developed and tested. First, pH was allowed to increase (anoxic) and decrease (aerobic) within preset limits to control A/A cycling. A second approach detected the points of complete nitrification and denitrification using the differential of the pH signal. Comparison of the A/A digestion results with aerobic digesters indicated similar mixed-liquor volatile suspended solids and fecal coliform destruction with aerobic digestion but with better total nitrogen removal and superior dewatering characteristics.
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      Use of pH as Control Parameter for Aerobic/Anoxic Sludge Digestion

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    http://yetl.yabesh.ir/yetl1/handle/yetl/43776
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    • Journal of Environmental Engineering

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    contributor authorIbrahim Al-Ghusain
    contributor authorOliver J. Hao
    date accessioned2017-05-08T21:14:09Z
    date available2017-05-08T21:14:09Z
    date copyrightMarch 1995
    date issued1995
    identifier other%28asce%290733-9372%281995%29121%3A3%28225%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/43776
    description abstractAlternating aerobic/anoxic (A/A) digestion of waste activated sludge offers many advantages over traditional (aerobic or anaerobic digestion) methods. However, one of the main concerns in A/A digestion is the development of an on-line control strategy for alternating aerobic and anoxic cycles. Computerized pH monitoring has revealed two well-defined control points that correspond to complete nitrification (ammonia valley) and denitrification (nitrate apex). The pH control points were consistent with those previously identified using the oxidation reduction potential. Based on these findings, two real-time control strategies were developed and tested. First, pH was allowed to increase (anoxic) and decrease (aerobic) within preset limits to control A/A cycling. A second approach detected the points of complete nitrification and denitrification using the differential of the pH signal. Comparison of the A/A digestion results with aerobic digesters indicated similar mixed-liquor volatile suspended solids and fecal coliform destruction with aerobic digestion but with better total nitrogen removal and superior dewatering characteristics.
    publisherAmerican Society of Civil Engineers
    titleUse of pH as Control Parameter for Aerobic/Anoxic Sludge Digestion
    typeJournal Paper
    journal volume121
    journal issue3
    journal titleJournal of Environmental Engineering
    identifier doi10.1061/(ASCE)0733-9372(1995)121:3(225)
    treeJournal of Environmental Engineering:;1995:;Volume ( 121 ):;issue: 003
    contenttypeFulltext
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