液压系统对硫化床性能的影响:脱和不成比例化
Yi-Lu Sun1, Wei Wei2, Huu Hao Ngo2
1Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China.
Environmental research
|September 30, 2023
概括
建筑湿地中的硫包装床 (SPB) 在水平流 (HF) 中显示出更好的酸盐去除,但产生更多的硫化物. 垂直流 (VF) 减少硫化物,但降低了酸盐去除效率.
科学领域:
- 环境工程 环境工程
- 水处理技术水处理技术
- 生物地质化学过程
背景情况:
- 硫包装床 (SPB) 在建筑湿地中用于酸盐的去除.
- 液压系统显著影响SPB性能,但其影响尚未得到充分理解.
- 了解这些机制对于优化酸盐去除和管理硫化物生产至关重要.
研究的目的:
- 在不同的水平流 (HF) 和垂直流 (VF) 液压系统下调查试点规模的SPB的性能.
- 在不同的流量条件下分析硫自脱 (SAD) 和硫不成比例 (SDP) 之间的相互作用.
- 开发用于评估液压系统和减轻SPB中的硫化物排放的方法.
主要方法:
- 试点规模的SPB实验是在不同的HF和VF液压系统下进行的.
- 对于每个方案,酸盐去除效率和硫化物产生量化.
- 分析了SAD基板和SDP产品的空间分布,以了解流动动力学.
- 计算流体动力学 (CFD) 模拟用于体制预测.
- 作为一种控制硫化物排放的策略,测试了通风.
主要成果:
- 高频模式实现了比VF模式 (0.9-2.8 mg-N/L) 更高的酸盐去除 (3.1-4.4 mg-N/L).
- 与VF模式 (1.5-2.3 mg/L) 相比,HF模式导致硫化物产量增加 (3.8-5.6 mg/L).
- 对基质和产品分布的分析揭示了停滞和短路等流动模式.
- 气化有效降低了硫化物排放到0.5 mg/L以下.
结论:
- 液压系统极大地影响了SPB的性能,影响了酸盐的去除和硫化物生成.
- 对基质/产品分布的详细分析为水力动力学提供了洞察力,超过了一般的CFD预测.
- 优化硫封装和战略通风是有效和安全地在建筑湿地实施SPB的关键.
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