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Testing the limits of TN removal technology - Investigating soluble organic nitrogen generation in a biological wastewater treatment process

机译：在生物废水处理过程中测试TN去除技术研究的限制 - 研究生物废水处理过程中的可溶性有机氮

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With the rise in eutrophication cases which leads to fish kills, deteriorating aquatic environment and contamination of the drinking water supplies, strict regulations are being enforced for the wastewater treatment facilities (WWTF) to regulate the daily nutrient discharge limits. Therefore, to satisfy the regulatory requirements, it is important to understand the limits of different processes employed at WWTF. Activated sludge (AS) process is a common biological treatment process (after pre-treatment) because it effectively reduces carbon content, is cost effective and is eco-friendly compared to physiochemical processes. An AS process primarily removes soluble chemical oxygen demand (sCOD) and the effluents contain both, soluble organics that are not removed by the process and, organic material produced during the process. The produced organic material in the effluent includes a large fraction of soluble organic nitrogen (sON). Therefore, the aim of this study was to examine the limits of AS process by accounting for sON production at different solids retention times (SRTs) (2, 5, 10 and 20 days). To examine the sON production, four bench-scale chemostat reactors, operated in parallel, were fed with synthetic wastewater with no organic nitrogen. In addition, fractions of effluent COD and organic nitrogen i.e. particulate, colloidal and soluble (pCOD and pON, cCOD and cON, sCOD and sON) along with biodegradable fraction of effluent sON (bsON) were investigated at different SRTs. Effluent sON generated at each SRT was identified. At SRT of 2 d 4.56 ± 2.64 mg-N/L, at SRT of 5 d 3.19 ± 0.96 mg-N/L, at SRT of 10 d 2.50 ± 0.48 mg-N/L and at SRT of 20 d 28.59 ± 6.22 mg-N/L of sON was generated. Although effluent sON concentration decreased from SRT of 2 d to 10 d, a significant spike was observed at SRT of 20 d, which is suggested to be exerted by endogenous residues. At SRTs of 2, 5 and 10 d, >50% sON was biodegradable whereas only 35% sON was biodegradable at SRT of 20 d. Therefore, AS process besides removing sCOD, generates biologically-produced sON which can be significantly high at long SRTs.
机译：随着富营养化病例的增加，导致鱼类杀死，水生环境恶化和饮用水供应的污染，正在为废水处理设施（WWTF）强制执行严格的规定，以调节日常营养排放限制。因此，为了满足监管要求，重要的是要了解WWTF在WWTF中使用的不同过程的限制。活性污泥（AS）过程是一种常见的生物处理方法（预处理后），因为它有效降低碳含量，具有成本效益，与生理过程相比是环保的。作为过程主要去除可溶性化学需氧量（SCOD），污水含有含有的可溶性有机物，并且在该过程中产生的有机材料。流出物中产生的有机材料包括大部分可溶性有机氮（儿子）。因此，本研究的目的是通过在不同固体保留时间（SRT）（2,5,10和20天）的儿子产生来检查作为过程的限制。为了检查儿子生产，四个平行运行的台级化疗液反应器用合成废水加入，没有有机氮。另外，在不同的Srts上研究了污水鳕鱼和有机氮的部分颗粒，胶体和可溶性（PCOD和PON，CCOD和CO，SCOD和SCCOD和CON，SCOD和SCCOD和CON），在不同的Srts下进行了生物降解的污水儿鉴定了在每个SRT时产生的流出子。在SRT为2d 4.56±2.64mg-n / l，在SRT为5d 3.19±0.96mg-N / L，SRT为10d 2.50±0.48 mg-N / L和20d 28.59±6.22的SRT生成了mg-n / l儿子。尽管从2d至10d的SRT降低的流出子浓度降低，但在20d的SRT下观察到显着的尖峰，这表明该施加以通过内源残留物施加。在2,5和10 d的Srts，> 50％的儿子是可生物降解的，而只有35％的儿子在20天的SRT下可生物降解。因此，作为除了去除Scod之外的过程，产生能够在长SRTS中显着高的生物产生的儿子。

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