查看“︁污泥容積指數”︁的源代码

'''污泥容積指數'''（Sludge Volume Index，簡稱SVI）常作為活性污泥法之設計因子。SVI值受膠羽大小、SS濃度、絲狀菌之存在等污泥特性所影響<ref>{{cite web |author1=陳秋楊 |title=污泥容積指數（SVI）與活性汚泥特性之關係 |url=https://proj.ftis.org.tw/eta/WebPhotos/2017/002-15-%E6%B1%A1%E6%B3%A5%E5%AE%B9%E7%A9%8D%E6%8C%87%E6%95%B8(SVI)%20%20%E8%88%87%E6%B4%BB%E6%80%A7%E6%B1%A1%E6%B3%A5%E7%89%B9%E6%80%A7%E4%B9%8B%E9%97%9C%E4%BF%82.pdf}}</ref>。
== 定義 ==
自曝氣槽中抽出混合懸浮固體液倒入1L量筒內靜置30分鐘，1克活性污泥所佔之容積。

== 計算公式 ==
污泥容積指數可用以下表達式計算：
:<math>SVI = \frac{settled\;sludge\;volume(mL/L)}{MLSS(g/L)} = \frac{SV(mL/L) \times 10^3}{MLSS(mg/L)}</math>

== 意義 ==
SVI太大代表沉降性不佳，增加終沉池流出之SS；SVI太小表示污泥太過緊密，導致排泥困難、阻塞污泥管線。傳統式活性污泥法建議SVI介於70～140。容易降解之基質可能導致膠羽外部微生物占主導地位，使膠羽結構較鬆散，粒徑相對較小，沉降性能穩定性降低，污泥更容易發生絲狀膨脹<ref>{{cite journal |author1=Chundi Gao |author2=Fan Yang |author3=Zinan Tian |author4=Diyao Sun |author5=Weilin Liu |author6=Yongzhen Peng |title=Pathways of inhibition of filamentous sludge bulking by slowly biodegradable organic compounds |journal=Journal of Environmental Sciences |date=2024 |pages=Pages 104-115 |doi=10.1016/j.jes.2024.03.021 |url=https://www.sciencedirect.com/science/article/pii/S1001074224001360}}</ref>。低溶氧易使絲狀菌過度生長，令產生的活性污泥沉降和濃縮性能較差<ref>{{cite journal |author1=Britt-Marie Wilén |author2=Peter Balmér |title=The effect of dissolved oxygen concentration on the structure, size and size distribution of activated sludge flocs |journal=Water Research |date=1999 |page=Pages 391-400 |doi=10.1016/S0043-1354(98)00208-5 |url=https://www.sciencedirect.com/science/article/pii/S0043135498002085}}</ref>。污泥過度膨脹會導致迴流率增加，影響污泥迴流反應器之濃度，並導致污泥濃縮困難等廢污泥處理問題<ref>{{cite journal |author1=Jason Minnie |author2=Christopher Gaszynski |author3=Moses Basitere |author4=David Ikumi |title=Modelling filamentous bacteria in activated sludge systems and the advancements of secondary settling tank models: A review |journal=Biochemical Engineering Journal |date=2022 |doi=10.1016/j.bej.2022.108598 |url=https://www.sciencedirect.com/science/article/pii/S1369703X22002674}}</ref>。

== 參考文獻 ==
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[[Category:環境工程]]