水泥砂浆内衬管输配高品质再生水水质变化规律
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摘要
水泥砂浆内衬管因其化学性质稳定、防腐性能良好在输水领域得到了广泛应用。但在输送高品质再生水(经过反渗透工艺处理的再生水,因离子含量极少,水质接近纯水被称为高品质再生水)时,p H值升高、钙离子析出等水质参数变化问题明显,也存在着对管网材料的潜在损害。搭建了长为120 m的DN100水泥砂浆内衬铸铁管的管网模拟装置,研究了水泥砂浆内衬管输配高品质再生水时水质变化规律。结果表明,水泥砂浆内衬管运输再生水时水质变化明显,p H值、TDS(总溶解固体)、电导率、钙离子浓度以及硅、硫、铝元素浓度都有明显升高,未检测到Fe、Mn离子析出。水质变化主要是由于水泥砂浆中氢氧化钙溶解溶出和水化物的分解溶出导致。
Cast iron pipes lined with cement mortar are widely used for water supply,due to its good corrosion resistance and chemical stability. However,p H and calcium ion concentrations may change significantly when high quality reclaimed water is conveyed using cast iron pipe lined with cement mortar( high quality reclaimed water is defined as the water with minimal amount of ions,treated by the reverse osmosis technology). Meanwhile,the erosion of the cement mortar poses a potential risk. In this study,a dynamic simulated water distribution model test-loop,which was 120 meters long and made of DN100 cast iron pipe lined with cement mortar,was built to investigate the impact of changes in the reclaimed water quality. The results showed that parameters of water quality such as p H,TDS,conductivity,calcium,sulfur,aluminum and silicon increased substantially after reclaimed water was conveyed in the system. However,iron and manganese were not detected. The changes in water quality were due to dissolving of calcium hydroxide and other hydrates in the cement.
Cast iron pipes lined with cement mortar are widely used for water supply,due to its good corrosion resistance and chemical stability. However,p H and calcium ion concentrations may change significantly when high quality reclaimed water is conveyed using cast iron pipe lined with cement mortar( high quality reclaimed water is defined as the water with minimal amount of ions,treated by the reverse osmosis technology). Meanwhile,the erosion of the cement mortar poses a potential risk. In this study,a dynamic simulated water distribution model test-loop,which was 120 meters long and made of DN100 cast iron pipe lined with cement mortar,was built to investigate the impact of changes in the reclaimed water quality. The results showed that parameters of water quality such as p H,TDS,conductivity,calcium,sulfur,aluminum and silicon increased substantially after reclaimed water was conveyed in the system. However,iron and manganese were not detected. The changes in water quality were due to dissolving of calcium hydroxide and other hydrates in the cement.
引文
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[12]甘庆午,吴珊,厉智成.再生水对钢管与球墨铸铁管的腐蚀研究[J].南水北调与水利科技,2014,12(2):181-184.
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[14]Rothstein D,Thomas J J,Christensen B J,et al.Solubility behavior of Ca-,S-,Al-,and Si-bearing solid phases in Portland cement pore solutions as a function of hydration time[J].Cement and Concrete Research,2002,32(10):1663-1671.
[2]张振华,靳军涛,吴光学,等.再生水中铸铁材料的微生物腐蚀特征研究[J].中国给水排水,2016,32(19):108-114.
[3]林杨杰,田一梅,吴云龙.高锰酸钾预氧化与预氯化协同预处理再生水原水[J].中国给水排水,2017,33(1):118-120.
[4]王建淼,孙傅,曾思育,等.再生水管网水质特征及其影响因素研究[J].中国给水排水,2016,32(15):80-84.
[5]聂守田,王楠,王璐.西安市泾渭新城污水厂提标改造及再生水利用工程设计[J].中国给水排水,2016,32(14):44-47.
[6]中华人民共和国住房和城乡建设部.中国城乡建设统计年鉴[M].北京:中国计划出版社,2014.
[7]冯运玲,戴前进,李艺,等.几种典型再生水处理工艺出水水质对比分析[J].给水排水,2011,37(2):47-49.
[8]Crook J.Quality criteria for reclaimed water[J].Water Sci Technol,1991,24(9):109-121.
[9]童祯恭,刘遂庆,陶涛.供水管网中管材对水质影响的探讨[J].城市公用事业,2006,20(1):22-24.
[10]石晔,石宝友,蒋玉明,等.高品质再生水专用管网材质的选择[J].中国给水排水,2012,28(19):59-62.
[11]杨羽,石宝友,张建锋,等.再生水及自来水对水泥内衬管的侵蚀特性比较[J].中国给水排水,2013,29(23):81-84.
[12]甘庆午,吴珊,厉智成.再生水对钢管与球墨铸铁管的腐蚀研究[J].南水北调与水利科技,2014,12(2):181-184.
[13]Aligizaki K K.Pore Structure of Cement-based Materials:Testing,Interpretation,and Requirements[M].Florida:CRC Press,2005.
[14]Rothstein D,Thomas J J,Christensen B J,et al.Solubility behavior of Ca-,S-,Al-,and Si-bearing solid phases in Portland cement pore solutions as a function of hydration time[J].Cement and Concrete Research,2002,32(10):1663-1671.