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Five sewage-treatment plants were studied for 1 year including the two plants of the Beijing Gaobeidian Sewage Treatment Factory, the largest activated-sludge scheme in China, with a treatment capacity of one million tons of sewage daily. Vorticella convallaria, Epistylis plicatilis, Aspidisca sulcata and Arcella hemisphaerica occurred frequently at all five plants and usually appeared in large numbers...
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