Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.
Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.
Bioresour Technol. 2018 Jul;259:146-155. doi: 10.1016/j.biortech.2018.03.035. Epub 2018 Mar 9.
Excess sludge minimization was studied in a MBR with pre-denitrification scheme. Sludge minimization, nitrogen removal performance and membrane fouling tendency were investigated in two configurations, characterized by a different position of the sludge retention reactor (SRR). In particular, the SRR was placed: i) in the return activated sludge line (Anaerobic Side-Stream Reactor - ASSR configuration) and ii) in the mainstream between the anoxic and aerobic reactor (Anaerobic Main-Stream Reactor - AMSR configuration). The achieved results demonstrated that the ASSR enabled a higher excess sludge reduction (74% vs 32%), while achieving lower biological nitrogen removal (BNR) (TN = 63% vs 78%) and membrane fouling tendency (FR = 2.1 · 10 m dvs 4.0 · 10 m d) than the AMSR. It was found that metabolism uncoupling, destruction of EPS and endogenous decay simultaneously occurred in the ASSR. Conversely, selective enrichment of bacteria population with low biomass yield was found the main mechanism affecting sludge minimization in the AMSR.
采用具有预反硝化方案的 MBR 研究了剩余污泥的最小化。在两种构型中研究了污泥减量化、脱氮性能和膜污染倾向，其特征在于污泥停留反应器 (SRR) 的位置不同。具体而言，SRR 分别放置在：i) 回流活性污泥管路中（厌氧侧流反应器-ASSR 构型）和 ii) 缺氧和好氧反应器之间的主流中（厌氧主流反应器-AMSRe 构型）。所获得的结果表明，ASSR 能够实现更高的剩余污泥减少（74%比 32%），同时实现更低的生物氮去除（TN=63%比 78%）和膜污染倾向（FR=2.1·10md 比 4.0·10md）比 AMSR。发现 ASSR 中同时发生代谢解耦、EPS 破坏和内源衰减。相反，在 AMSR 中，发现细菌种群的选择性富集和低生物量产率是影响污泥减量化的主要机制。
