Wastewater remediation using coal ash
Wastewater remediation using coal ash
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DOI：
10.1007/s101630300001
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发表时间：
2003-03
影响因子：
3.1
通讯作者：
D. Kirk;C. Jia;J. Yan;A. Torrenueva
中科院分区：
文献类型：
--
作者：
D. Kirk;C. Jia;J. Yan;A. Torrenueva
小型家庭化粪池排放过量的营养物质，如磷和氮，以及病原体，这可能会减少当地的供水。不幸的是，对于独栋住宅来说，传统的化学和物理处理是不可行的。这项工作报告了一种潜在的有吸引力的解决方案，通过使用低成本的工业废物--火山灰来清除污染物，以保护当地的供水。燃煤产生的灰是发电的结果。大部分火山灰被丢弃在垃圾填埋场和地表蓄水池中，或者储存在现场或非现场，产生大山或平坦的山谷。只有一小部分灰烬被利用，主要用于水泥工业和道路建设。例如，在加拿大，使用率不到25%。因此，如果能找到有用的应用，就有机会更好地利用这种废物。实验室小试和现场工业性试验表明，灰具有去除生活污水中磷的能力。实验和田间数据表明，磷酸盐水平和钙水平可以相关，尽管不是以一种简单的方式。此外，填充床中的灰分还去除了总悬浮固体(TSS)、生物需氧量(BOD)、氨氮(NH3-N)、总凯氏氮(TKN)等。Coli.对E.在所研究的病例中，大肠菌群接近100%。
Small-scale domestic septic tanks discharge excess nutrients such as phosphorus and nitrogen, as well as pathogens, which can degrade local water supplies. Unfortunately, traditional chemical and physical treatments are not practicable for single-home dwellings. This work reports on a potentially attractive solution to protect local water supplies by using a low-cost industrial waste, coal ash, for contaminant removal. Coal ash is produced as a consequence of electric power generation. The majority of the ash is disposed of in landfills and surface impoundments, or stored on- or off-site, producing large hills or leveling valleys. Only a small portion of the ash is ever utilized, mainly by cement industries and road construction. For example, in Canada less than 25% is used. Therefore, if useful applications can be found, an opportunity exists to make better use of this waste material. Bench-scale laboratory experiments and full-scale field tests show that coal ash has the capacity to remove phosphorus from domestic waste water. The experimental and field data demonstrate that phosphate levels and calcium levels can be correlated, although not in a simple manner. In addition, the ash in packed beds removed total suspended solid (TSS), biological oxygen demand (BOD), ammonia nitrogen (NH3—N), total Kjeldahl nitrogen (TKN), andE. coli.The removal ofE. coliwas close 100% in the cases studied.