在巴西奥里藏特贝洛的Serra Azul直接过滤厂进行了实验室和中试工厂研究，以确定除锰和冲洗水回收的最佳条件。推荐的化学添加的倒序-氯-三氯化铁-石灰-为锰氧化提供了明确的优势。无论是聚电解质的使用还是过滤器冲洗水的回收都不有利。将现有的深层改为具有粗介质的优化浅层，将有助于过滤器的清洗。要充分清洁过滤器，需要比最初设计的清洗率更高的清洗率。 添加阴离子聚电解质可以改善污泥的沉降和比阻，但不会增加浓缩污泥或滤饼污泥的浓度。冲洗水将使用组合均衡沉淀池回收，污泥将在泻湖中干燥。包括11个参考文献、表格、图表。

Laboratory and pilot-plant studies were conducted to define the optimum conditions for manganese removal and washwater recovery at the Serra Azul direct filtration plant in Belo, Horizonte, Brazil. The inverted sequence of chemical addition recommended - chlorine-ferric chloride-lime - offers definite advantages for manganese oxidation. Neither the use of polyelectrolytes nor the recycling of filter washwater was found to be advantageous. Changing the existing deep beds to the optimized shallower beds with coarse media will facilitate washing of filters. Wash rates that are higher than those originally designed are necessary to adequately clean the filters. Adding anionic polyelectrolyte was observed to improve the settling and specific resistance of the sludge but did not increase thickened or filter cake sludge concentrations. The washwater will be recovered using combined equalization-settling tanks, and the sludge will be dried in lagoons. Includes 11 references, tables, figures.