Social and economic feasibility of struvite recovery from urine at the community level in Nepal
Social and economic feasibility of struvite recovery from urine at the community level in Nepal
复制标题
在尼泊尔社区一级从尿液中回收鸟粪石的社会和经济可行性
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
K. Udert
中科院分区：
文献类型：
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作者：
E. Tilley;B. Gantenbein;R. Khadka;K. Udert
面对不断上涨的磷价格，尼泊尔和所有农业社会一样，迫切需要低成本、可持续的磷和氮来源。加德满都山谷的Siddhipur镇被选为研究地点，以确定利用源头分离的尿液作为原料建立社区规模的鸟粪石加工中心的可行性。重点小组、讲习班和家庭问卷被用来确定文化上的接受程度和支付意愿。尿液质量和数量的测量，沿着肥料成本分析，以确定经济可行性。采用当前当地营养值进行回归分析，计算鸟粪石的理论值;鸟粪石的估计营养值为每公斤24至41 NRp，与当地可用的磷酸二铵（DAP）范围相同。由于可用镁源的高价格，鸟粪石的生产目前成本约为25 NRp/kg。尽管如此，鸟粪石沉淀在经济上是可行的，至少有三个原因。首先，尼泊尔拥有自己的菱镁矿矿床，这可能使其能够生产更便宜的镁资源。其次，消费者可能会为当地生产的鸟粪石支付比进口合成肥料更高的价格。第三，鸟粪石沉淀的流出物还可以用作有价值的高效氮钾肥。尽管影子定价的基础上的营养成分，真正的价值鸟粪石不能知道，直到它的生产和销售。
In the face of increasing phosphorus prices, Nepal, like all agrarian societies is in imminent need of a low-cost, sustainable source of phosphorus and nitrogen. The town of Siddhipur in the Kathmandu valley was selected as a study site to determine the feasibility of establishing a community-scale struvite processing centre using source-separated urine as a feedstock. Focus groups, workshops and household questionnaires were used to determine cultural acceptability and willingness to pay. Urine quality and quantity measurements, along with fertilizer cost analysis were used to determine the economic feasibility. A regression analysis using the current, local value of the nutrients was used to calculate the theoretical value of struvite; the estimated nutrient value of struvite was found to be 24 to 41 NRp per kilogram, which is in the same range as locally available Diammonium Phosphate (DAP). The production of struvite would currently cost about 25 NRp/kg due to high prices of available magnesium sources. Nevertheless, struvite precipitation can be economically feasible for at least three reasons. First, Nepal possesses its own magnesite deposits, which might allow it to produce cheaper magnesium sources. Second, customers are likely to pay more for locally produced struvite than for imported synthetic fertilizers. Third, the effluent from struvite precipitation can also be used as a valuable and efficient nitrogen and potassium fertilizer. Despite shadow-pricing based on the constituent nutrients, the true value of struvite can not be known until it is produced and sold.