Brown and Caldwell, Walnut Creek, CA, USA.
The University of Kansas, Lawrence, KS, USA.
Water Res. 2022 Feb 15;210:117991. doi: 10.1016/j.watres.2021.117991. Epub 2021 Dec 22.
The James R. Dolorio Water Reclamation Facility in Pueblo, Colorado, uses AvN aeration controls to lower aeration energy while promoting carbon-efficient nutrient removal and hydrocyclone-based wasting to achieve SVI improvements and process intensification. The results from the full-scale installation showed that hydrocyclone-based wasting helped improve settling characteristics by reducing the SVI from 200 ± 52 mL/g to 83 ± 22 mL/g within weeks of operation. PAO and nitrifiers were preferentially retained in dense flocs and granules, while lighter heterotrophic and filamentous organisms were preferentially wasted, thus uncoupling the SRT of these two fractions relative to the overall SRT. The SRT was estimated at 14.4 ± 3.4 days for dense aggregates and 7.1 ± 2.3 days for lighter flocs. The use of AvN control with continuous low DO conditions resulted in low DO conditions (< 0.3 mgO/L) reducing air demand by 50% while providing excellent nitrogen (effluent TIN < 11 mgN/L) and TP removal (effluent TP < 1 mgP/L) at low primary effluent COD/N ratio of 6.0. The presence of comammox was demonstrated through molecular analysis, while ex-situ batch tests revealed the presence of DPAO, which could have attributed to the energy and carbon-efficient biological nutrient removal.
科罗拉多州普韦布洛的詹姆斯·R·多洛里奥水再生设施采用 AvN 曝气控制，在促进碳高效养分去除的同时降低曝气能耗，并采用水力旋流器进行排泥以实现 SVI 改善和工艺强化。全尺寸安装的结果表明，水力旋流器排泥在数周的运行内将 SVI 从 200±52mL/g 降低至 83±22mL/g，从而改善了沉降特性。聚磷菌和好氧颗粒污泥中的硝化菌被优先保留在致密的絮体和颗粒中，而较轻的异养菌和丝状菌则被优先排泥，从而使这两个部分的 SRT 与总 SRT 解耦。致密聚集体的 SRT 估计为 14.4±3.4 天，较轻絮体的 SRT 为 7.1±2.3 天。采用 AvN 控制并持续保持低 DO 条件，可将低 DO 条件（<0.3mgO/L）下的空气需求降低 50%，同时在低原水 COD/N 比 6.0 的情况下，实现优异的氮（出水总氮 < 11mgN/L）和磷（出水总磷 < 1mgP/L）去除。通过分子分析证明了同时硝化反硝化（comammox）的存在，而体外批式试验则揭示了反硝化除磷（DPAO）的存在，这可能归因于其能量和碳高效的生物脱氮除磷。
