plant nitrate concentration
plant nitrate concentration
植物硝酸盐浓度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Due to the high concentration of COD, and the existence of many pollution matter in the nitrate wastewater, and its treatment is rather difficult for small nitrate plant.
氮肥生产废水污染物成份多， COD 浓度高，特别是小企业，治理起来困难很大。
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