YUEYaoxu,YANXiaolei,QINShiyi,et al.Pilot Study of Circulating Granulation Fluidized Bed for Concentrated Water Softening and Pipeline Scale Inhibition[J].China Water & Wastewater,2026,42(5):41-46.
循环造粒流化床对浓水软化和管道阻垢的中试研究
- Title:
- Pilot Study of Circulating Granulation Fluidized Bed for Concentrated Water Softening and Pipeline Scale Inhibition
- Keywords:
- circulating granulation fluidized bed; reverse osmosis concentrate; high-hardness water softening; scaling index; pipeline scaling
- 摘要:
- 以陕西某超滤-反渗透（简称“双膜”）工艺地下水厂产生的反渗透浓水为研究对象，采用化学结晶循环造粒流化床与循环结团造粒流化床组合系统（简称“循环造粒流化床系统”）进行浓水软化和管道阻垢中试研究。当上升流速为80 m/h、晶种投加量为225 g/L、氢氧化钠投加量为500~550 mg/L、盐酸投加量为50~55 mg/L、聚丙烯酰胺（PAM）投加量为1.00 mg/L时，总硬度和钙离子去除率分别可达到60%和88%，出水浊度为0.2~0.5 NTU、pH为7.10，药剂成本为2.14~2.35 元/m3，此时出水Langelier饱和指数为-0.37、Ryznar稳定指数为7.77、Puckorious结垢指数为6.65，满足管道不结垢条件。经EDS和XRD表面元素分析，结晶颗粒物主要成分为高纯度CaCO3。中试结果表明，循环造粒流化床系统能有效去除浓水中的硬度和碱度，降低管道的碳酸钙结垢倾向，可为其在双膜工艺水厂中的实际应用提供理论依据和数据支撑。
- Abstract:
- This study conducted a pilot-scale investigation on concentrated water softening and pipeline scale inhibition using a combined system comprising a chemical crystallization circulating granulation fluidized bed and a circulating agglomeration granulation fluidized bed (collectively referred to as the circulating granulation fluidized bed system). The feed water was reverse osmosis (RO) concentrate from an ultrafiltration-RO (“dual membrane”) groundwater treatment plant in Shaanxi Province. Under the optimal operating conditions—upflow velocity of 80 m/h, seed crystal dosage of 225 g/L, sodium hydroxide dosage of 500-550 mg/L, hydrochloric acid dosage of 50-55 mg/L, and polyacrylamide (PAM) dosage of 1.00 mg/L—the removal rates for total hardness and calcium ions reached 60% and 88%, respectively. The treated effluent exhibited a turbidity of 0.2-0.5 NTU and a pH of 7.10. The chemical cost was calculated to be 2.14-2.35 CNY/m3. The scaling propensity indices of the effluent were as follows: Langelier saturation index (LSI) of -0.37, Ryznar stability index (RSI) of 7.77, and Puckorious scaling index (PSI) of 6.65, collectively indicating a low potential for pipeline scaling. Surface element analysis via EDS and XRD confirmed that the primary component of the crystalline particles was high-purity CaCO3. The pilot-scale results demonstrate that the circulating granulation fluidized bed system can effectively remove hardness and alkalinity from the concentrate, reduce the tendency of calcium carbonate scaling in pipelines, and thereby provide a theoretical basis and data support for its practical application in dual membrane groundwater treatment plants.
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