Assessment of Groundwater Stability Using Corrosion and Scaling Tendency Indices on Selected Springs in the Manga Region in Nyamira County, Kenya

We present the result of groundwater stability assessment on three major springs in the Manga region in Nyamira County found in Kenya in 2018. These springs are Kiangoso (SP1), Kerongo (SP2) and Tetema (SP3). The corrosion and scaling tendency indices were obtained using the Langelier saturation index (LSI), Ryznar stability index (RSI), and Puckorius scaling index (PSI). The LSI values obtained for SP1, SP2, and SP3 are −3.93, −4.71, and −4.17, respectively, while using RSI, the values obtained for SP1, SP2, and SP3 are 14.15, 14.53, and 13.74, respectively. Using PSI, the values of SP1, SP2, and SP3 are 5.58, 5.45, and 5.58, respectively. From the interpretation of the indices, the groundwater from the three springs in the Manga region using LSI and RSI showed intolerable corrosion;hence, it is unlikely to scale as obtained from PSI.

改良型诱晶软化技术对污水厂尾水结垢控制的效果

城镇生活污水厂尾水补充工业循环冷却水时存在结垢问题。文章以LW污水厂尾水为研究对象,考察改良型诱晶软化技术对污水厂尾水结垢的控制效能,探讨处理出水主要水质指标的控制范围和资源化利用的可行性。结果表明,污水厂尾水中硬度和碱度含量较高,易发生结垢问题。结合实际生产用水需求,当软化药剂投加量为80 mg/L左右时,处理效果和经济效益显著:处理出水的硬度、碱度等主要水质指标稳定,Puckorius结垢指数(PSI)为7.8左右,结垢倾向已完全消除;工艺运行成本低于0.2元/m^(3)。处理过程中产生以碳酸钙为主体成分的结晶颗粒可回用于烟气脱硫。综上,改良型诱晶软化技术可作为污水厂尾水阻垢抑垢处理的备选技术之一,处理出水水质情况满足循环冷却水补充水的水质要求。

水的电导率与结垢倾向关系研究

利用Langelier指数、Ryznar指数和Puckorius指数判断水的结垢倾向,得出电导率与结垢倾向的关系,把电导率1500μS/cm作为循环水结垢与否的判断标准。