短时间好氧消化（STAD）过程中通过废活性污泥还原 pH 值。
pH dependent of the waste activated sludge reduction by short-time aerobic digestion (STAD) process.
机构信息
State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; School of Civil and Transportation Engineering, Shanghai Urban Construction Vocational College, Shanghai 200432, China.
出版信息
Sci Total Environ. 2019 Feb 1;649:1307-1313. doi: 10.1016/j.scitotenv.2018.08.411. Epub 2018 Aug 29.
The short-time aerobic digestion (STAD) process has been found to be a unique and significant technique for the stabilization of waste activated sludge (WAS), but the influences of the system pH on the STAD process was unclear. This study systematically disclosed the influences of the system pH on the STAD process of WAS. Under neutral or weak alkaline conditions, although the biodegradation rates of VSS (0.0085 h) were low, high biodegradation rates of TCOD (k) (0.0096 h) were achieved. Less releases of the biopolymers from the WAS led to low concentrations of STOC, UV, the low MW organic matters, NH - N and PO - P in the supernatant. However, the appropriate pH for the microorganisms improved SOUR, indicating that the released substances were further reused or biodegraded by the microorganisms. Under acidic or alkaline conditions, the biodegradation rates of VSS (0.009-0.019 h) and TCOD (k) (0.005-0.009 h) were opposite with those under neutral or weak alkaline conditions. The releases of the biopolymers were increased, leading to high concentrations of STOC, UV, the low MW organic matters, PO - P and NH - N in the supernatant. However, the extreme pH inhibited the microbial activity. The SOURs were only 0.0097 h and 0.0053 h for system pH of 8.0 and 4.0, respectively. Accordingly, neutral and weak alkaline conditions should be more suitable for the STAD process of WAS. This work lays the foundation for optimizing system pH for the reduction of WAS in STAD system.
短时好氧消化（STAD）工艺被发现是一种稳定废活性污泥（WAS）的独特且重要的技术，但系统 pH 值对 STAD 工艺的影响尚不清楚。本研究系统地揭示了系统 pH 值对 WAS 的 STAD 工艺的影响。在中性或弱碱性条件下，尽管 VSS 的生物降解率（0.0085 h）较低，但 TCOD（k）的高生物降解率（0.0096 h）得以实现。WAS 中生物聚合物的较少释放导致 STOC、UV、低 MW 有机物、NH₋₅-N 和 PO₋₅-P 的上清液浓度较低。然而，适当的 pH 值有利于微生物，表明释放的物质被微生物进一步再利用或生物降解。在酸性或碱性条件下，VSS（0.009-0.019 h）和 TCOD（k）（0.005-0.009 h）的生物降解率与中性或弱碱性条件下的相反。生物聚合物的释放增加，导致 STOC、UV、低 MW 有机物、PO₋₅-P 和 NH₋₅-N 的上清液浓度较高。然而，极端的 pH 值抑制了微生物的活性。系统 pH 值为 8.0 和 4.0 时，SOUR 分别仅为 0.0097 h 和 0.0053 h。因此，中性和弱碱性条件应更适合 WAS 的 STAD 工艺。这项工作为优化 STAD 系统中减少 WAS 的系统 pH 值奠定了基础。
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