Integrated urban water management is an increasingly popular concept that cost-effectively maximizes system-wide performance by holistically considering all aspects of water and wastewater sectors. An innovative technology enabling production of high-quality bioenergy and an iron salt, ferrous carbonate ($\text{FeC}{\mathrm{O}}_3$$\text{FeC}{\mathrm{O}}_3$), represents a significant opportunity for integrated urban water management. This study experimentally evaluates the effect of in-sewer $\text{FeC}{\mathrm{O}}_3$$\text{FeC}{\mathrm{O}}_3$ dosing on the performance of sewers and the downstream wastewater treatment plants. Two continuous-flow laboratory-scale urban wastewater systems, each consisting of sewer reactors, a sequencing batch wastewater treatment reactor, and an anaerobic digester, were operated in parallel. After establishing comparable performance, one served as the control without any chemical dosing, while the other received a dosing of $10\text{mg}\text{Fe}/\mathrm{L}$$10\text{mg}\text{Fe}/\mathrm{L}$ of $\text{FeC}{\mathrm{O}}_3$$\text{FeC}{\mathrm{O}}_3$ in its sewer reactors. Compared to the control, the $\text{FeC}{\mathrm{O}}_3$$\text{FeC}{\mathrm{O}}_3$-dosed experimental system reduced dissolved sulfide concentrations by $32.2\pm 3.3\%$$32.2\pm 3.3\%$ (at $0.58\pm 0.05\text{mg}\mathrm{S}/\text{mg}\text{Fe}$$0.58\pm 0.05\text{mg}\mathrm{S}/\text{mg}\text{Fe}$, or $1.0\text{mol}\text{Fe}/\text{mol}\mathrm{S}$$1.0\text{mol}\text{Fe}/\text{mol}\mathrm{S}$) in sewer reactors, decreased phosphate concentrations by $38.3\%\pm 3.2\%$$38.3\%\pm 3.2\%$ (at $0.37\pm 0.04\text{mg}\mathrm{P}/\text{mg}\text{Fe}$$0.37\pm 0.04\text{mg}\mathrm{P}/\text{mg}\text{Fe}$, or $1.5\text{mol}\text{Fe}/\text{mol}\mathrm{P}$$1.5\text{mol}\text{Fe}/\text{mol}\mathrm{P}$) in sequencing batch reactors, and lowered dissolved sulfide concentrations by $72.0\pm 4.2\%$$72.0\pm 4.2\%$ ($18.9\pm 2.4\text{mg}\mathrm{S}/\mathrm{L}$$18.9\pm 2.4\text{mg}\mathrm{S}/\mathrm{L}$) in the anaerobic sludge digester. Iron accumulated in the sludge and improved sludge settleability by $33.9\pm 5.5\%$$33.9\pm 5.5\%$ and enhanced dewaterability of anaerobically digested sludge by $15.9\pm 2.0\%$$15.9\pm 2.0\%$. The findings indicate multiple benefits from the integrated use of $\text{FeC}{\mathrm{O}}_3$$\text{FeC}{\mathrm{O}}_3$, potentially being as a substitute for the currently used iron salts in urban wastewater systems.

中文翻译：

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通过现场生产和应用碳酸亚铁实现综合城市污水管理


综合城市水管理是一个越来越受欢迎的概念，它通过全面考虑水和废水部门的各个方面，经济高效地最大限度地提高整个系统的性能。一种创新技术，能够生产高质量的生物能源和铁盐碳酸亚铁 （FeCO3“>$\text{FeC}{\mathrm{O}}_3$）代表了城市水资源综合管理的重要机遇。本研究实验评估了下水道 FeCO3“>$\text{FeC}{\mathrm{O}}_3$ 的影响对下水道和下游污水处理厂的性能进行计量。两个连续流实验室规模的城市污水系统，每个系统由下水道反应器、一个序批式废水处理反应器和一个厌氧消化器组成，并联运行。 在建立可比性能后，一种作为对照，没有任何化学剂量，而另一种接受 10mgFe/L 的剂量>$10\text{毫克}\text{Fe}/\mathrm{L}$ 的 $\text{铁}{\mathrm{O}}_3$在它的下水道反应器中。与对照相比，FeCO3“>$\text{FeC}{\mathrm{O}}_3$ 剂量实验系统将溶解硫化物浓度降低了$32.2\pm 3.3\%$ （0.58$0.58\pm 0.05\text{毫克}\mathrm{S}/\text{mg}\text{铁}$，或 $1.0\text{mol}\text{Fe}/\text{mol}\mathrm{S}$） 的磷酸盐浓度降低了 $38.3\%\pm 3.2\%$ （在$0.37\pm 0.04\text{毫克}\mathrm{P}/\text{mg}\text{Fe}$，或 $1.5\text{mol}\text{Fe}/\text{mol}\mathrm{P}$） 的浓度，溶解硫化物浓度降低了 $72.0\pm 4.2\%$ （$18.9\pm \mathrm{阿拉伯数字。}4\text{mg}\mathrm{S}/\mathrm{L}$）。铁在污泥中积累，污泥沉降率提高 $33.9\pm 5.5\%$ 和增强厌氧消化污泥的脱水能力$15.9\pm 2.0\%。$研究结果表明，FeCO3“>$\text{FeC}{\mathrm{O}}_3$ 的综合使用具有多种优势，可能作为城市废水系统中目前使用的铁盐的替代品。