Trouble of Activated Slude

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Other Title
  • 活性汚泥のトラブル
  • 活性汚泥のトラブル : 原因究明と対策
  • カッセイ オデイ ノ トラブル : ゲンイン キュウメイ ト タイサク
  • -Determine the Cause and Countermeasures-
  • ―原因究明と対策―

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Description

Many processing obstacles have occurred in the liquid waste treatment by an activated sludge method.<BR>It is pressing need to study the prime cause of these processing obstacles and to solve troubles.<BR>There are the following two important elements.<BR>•BOD load as a design problem<BR>•DO (dissolved oxygen) as an operation management index<BR>I think that BOD load evaluated by oxygen consumption for five days is not suitable.<BR>Because, it is presumed that more than the BOD load evaluated by oxygen consumption for five days is applied to activated sludge.<BR>A suspended substance (SS) is classified into minerals and an organic matter.<BR>Furthermore, an organic matter is classified into a soluble substance and an undissolved substance.<BR>Soluble SS begins to melt little by little in a processing cycle, and changes to BOD.<BR>The sum total of the BOD load of the raw water which flows into an aeration tank (biological treatment tub),and the BOD load into which soluble SS began to melt is the load (source of nutrient) to a microbe.<BR>Under the environment of an electrical overload, activated sludge carries out abnormal metabolism of the viscous substance (macromolecule polysaccharide).<BR>Activated sludge stops taking in BOD and oxygen, and DO meter shows the measurement value that dissolved oxygen is left.<BR>If it observes under a microscope, activated sludge has caused viscous bulking by an electrical overload in many cases.<BR>The dissolved oxygen measured is not necessarily the amount of oxygen which was used for activated sludge and remained.<BR>The ways of coping of the above-mentioned trouble are also explained.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 66 (12), 1340-1349, 2012

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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