Environmental Resources Research Department, National Institute of Environmental Research, Incheon, South Korea.
Measurement Analysis Department, Wonju Regional Environment Agency, Wonju-si, Gangwon-do, South Korea.
Waste Manag Res. 2023 Jan;41(1):195-204. doi: 10.1177/0734242X221105443. Epub 2022 Aug 1.
Incineration is the most effective method for reducing the increasing waste volume. However, as the pollutants generated during incineration may cause secondary pollution, blocking them in advance is necessary. During incineration, prevention facilities are operated to reduce the amount of pollutants. Conventional selective non-catalytic reduction (SNCR) reduces nitrogen oxides (NO) by injecting ammonia and urea as reducing agents. In this study, the NO reduction effect on food wastewater (FW) was examined. In addition, the removal efficiency was compared at different concentrations of urea mixed with FW. When different concentrations of urea were injected in SNCR facilities A, B and C, NO removal efficiencies of up to 75% were observed; with FW injection only, removal efficiency was 56%; and when both urea and FW were injected, removal efficiency was up to 79%. Although FW showed a lower NO removal efficiency than urea, injecting both increased the efficiency. In addition, when air pollutant emissions and the incinerator temperature were analysed, we found that they could be managed without exceeding the allowed limits. However, for the injection and incineration of reducing agents, the characteristics of the incineration facility and reducing agents must be considered.
焚烧是减少日益增加的废物量的最有效方法。然而，由于焚烧过程中产生的污染物可能会造成二次污染，因此有必要提前进行阻断。在焚烧过程中，会运行预防设施以减少污染物的数量。传统的选择性非催化还原（SNCR）通过注入氨和尿素作为还原剂来减少氮氧化物（NO）。在本研究中，考察了食品废水（FW）对 NO 的还原效果。此外，还比较了不同浓度的尿素与 FW 混合时的去除效率。当在 SNCR 设施 A、B 和 C 中注入不同浓度的尿素时，NO 的去除效率高达 75%；仅注入 FW 时，去除效率为 56%；而同时注入尿素和 FW 时，去除效率高达 79%。虽然 FW 的 NO 去除效率低于尿素，但同时注入两者可以提高效率。此外，在分析空气污染物排放和焚烧炉温度时，我们发现它们可以在不超过允许限值的情况下进行管理。然而，对于还原剂的注入和焚烧，必须考虑焚烧设施和还原剂的特性。
