Faculty of Agriculture, Kochi University, Monobe Otsu 200, Nankoku City, Kochi, 783-8502, Japan,
Environ Monit Assess. 2014 Sep;186(9):5605-16. doi: 10.1007/s10661-014-3806-6. Epub 2014 Jun 4.
In Cambodia, groundwater has been contaminated with arsenic, and purification of the water is an urgent issue. From 2010 to 2012, an international collaborative project between Japan and Cambodia for developing arsenic-removing technology from well water was conducted and supported by the foundation of New Energy and Industrial Technology Development Organization, Japan. Quality of well water was surveyed in Kandal, Prey Veng, and Kampong Cham Provinces, and a monitoring trial of the arsenic removal equipment using our patented amorphous iron (hydr)oxide adsorbent was performed. Of the 37 wells surveyed, arsenic concentration of 24 exceeded the Cambodian guideline value (50 μg L(-1)), and those of 27 exceeded the WHO guideline for drinking water (10 μg L(-1)). Levels of arsenic were extremely high in some wells (>1,000-6,000 μg L(-1)), suggesting that arsenic pollution of groundwater is serious in these areas. Based on the survey results, 16 arsenic removal equipments were installed in six schools, three temples, two health centers, four private houses, and one commune office. Over 10 months of monitoring, the average arsenic concentrations of the treated water were between 0 and 10 μg L(-1) at four locations, 10-50 μg L(-1) at eight locations, and >50 μg L(-1) at four locations. The arsenic removal rate ranged in 83.1-99.7%, with an average of 93.8%, indicating that the arsenic removal equipment greatly lower the risk of arsenic exposure to the residents. Results of the field trial showed that As concentration of the treated water could be reduced to <10 µg L(-1) by managing the As removal equipment properly, suggesting that the amorphous iron (hydr)oxide adsorbent has high adsorbing capacity for As not only in the laboratory environment but also in the field condition. This is one of the succeeding As removal techniques that could reduce As concentration of water below the WHO guideline value for As in situ.
在柬埔寨，地下水已受到砷的污染，因此净化水是当务之急。从 2010 年到 2012 年，日本和柬埔寨之间开展了一个国际合作项目，共同开发从井水去除砷的技术，并得到了日本新能源与产业技术开发组织基金会的支持。在干丹省、磅湛省和磅清扬省进行了井水质量调查，并对使用我们专利非晶态铁（氢）氧化物吸附剂的除砷设备进行了监测试验。在所调查的 37 口井中，有 24 口井的砷浓度超过了柬埔寨的指导值（50μg/L），有 27 口井的砷浓度超过了世界卫生组织的饮用水指导值（10μg/L）。一些井中的砷含量极高（>1000-6000μg/L），表明这些地区地下水砷污染严重。根据调查结果，在六所学校、三座寺庙、两个保健中心、四所私人住宅和一个公社办公室安装了 16 台除砷设备。经过 10 多个月的监测，四个地点的处理水砷浓度平均值在 0-10μg/L 之间，八个地点在 10-50μg/L 之间，四个地点>50μg/L。砷去除率在 83.1-99.7%之间，平均为 93.8%，表明除砷设备大大降低了居民砷暴露的风险。现场试验结果表明，通过适当管理除砷设备，处理水中的 As 浓度可降低至<10μg/L，这表明非晶态铁（氢）氧化物吸附剂不仅在实验室环境中，而且在野外条件下对 As 都具有高的吸附能力。这是一种能够将水中的砷浓度降低到世界卫生组织规定的砷含量标准以下的成功的除砷技术之一。
