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Inland Desalination Brine Disposal: A Baseline Study from Southern California on Brine Transport Infrastructure and Treatment Potential
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2021-11-09 , DOI: 10.1021/acsestengg.1c00276
Xinyu Tang 1 , Soyoon Kum 1 , Haizhou Liu 1
Affiliation  

In the inland region of Southern California, a 116-km brine line distribution system transports brackish desalination brine to the coast for treatment and ocean discharge; however, solid precipitation and pipeline scaling have occurred in the brine line. This case study investigated brine chemistry and solid precipitation behaviors in the brine line system. Brine chemical composition at multiple sites along the brine line was measured, and the theoretical type and amount of solid formation was predicted using chemical modeling. Lab-scale simulation experiments were performed to evaluate the impacts of antiscalant application on solid formation in the brine line. Sampling data showed that pre-existing solids discharged from inland brackish desalination plants accumulated in the brine line which may lead to scaling problems. Chemical modeling predicted that calcite, dolomite, silica, and hydroxyapatite were oversaturated but not precipitated. Lab simulation data suggested that the delayed solid formation was mostly due to the presence of antiscalants, especially secondary antiscalants in low flow turbulence conditions. Results suggests that, in order to minimize scaling issues in the brine line infrastructure, two strategies of active on-site brine pretreatment to remove antiscalants and hardness ions and operational optimization on the brine line for better flow control and real-time monitoring should be considered.

中文翻译:

内陆淡化盐水处理:南加州关于盐水运输基础设施和处理潜力的基线研究

在南加州的内陆地区,一个 116 公里的盐水输配系统将半咸水淡化盐水输送到海岸进行处理和海洋排放;然而,盐水管线中出现了固体沉淀和管道结垢。本案例研究调查了盐水管线系统中的盐水化学和固体沉淀行为。测量了沿盐水线多个地点的盐水化学成分,并使用化学模型预测了固体形成的理论类型和数量。进行了实验室规模的模拟实验,以评估阻垢剂应用对盐水管线中固体形成的影响。抽样数据显示,从内陆半咸水淡化厂排放的预先存在的固体在盐水管线中积累,可能导致结垢问题。化学模型预测方解石、白云石、二氧化硅和羟基磷灰石是过饱和的,但没有沉淀。实验室模拟数据表明,延迟固体形成主要是由于阻垢剂的存在,尤其是在低流量湍流条件下的二级阻垢剂。结果表明,为了最大限度地减少盐水管线基础设施中的结垢问题,应考虑两种策略:主动现场盐水预处理以去除阻垢剂和硬度离子,以及盐水管线上的操作优化以更好地控制流量和实时监控。 . 特别是在低流量湍流条件下的二级阻垢剂。结果表明,为了最大限度地减少盐水管线基础设施中的结垢问题,应考虑两种策略:主动现场盐水预处理以去除阻垢剂和硬度离子,以及盐水管线上的操作优化以更好地控制流量和实时监控。 . 特别是在低流量湍流条件下的二级阻垢剂。结果表明,为了最大限度地减少盐水管线基础设施中的结垢问题,应考虑两种策略:主动现场盐水预处理以去除阻垢剂和硬度离子,以及盐水管线上的操作优化以更好地控制流量和实时监控。 .
更新日期:2021-11-09
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