我国磷复肥产业与磷酸盐工业的现状与发展趋势_电子资料文库 关键词]磷石膏;综合利用;无二次污染 [gap=590]Key words: phosphogypsum; comprehensive utilization; free secondary pollution
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The catalytic hydrogenization process offers a practical approach to remove nitrate from water due to the high efficiency and the benefit free from secondary pollution.
催化加氢还原硝酸盐生成氮气具有高效、无二次污染等特点，是一种应用前景良好的脱氮技术。
The Group is the national pollution-free pig standardization demonstrative enterprise, which possesses a secondary breeding expansion field, five standardization commercial pig production field.
拥有二级种猪扩繁场一个、标准化商品猪生产场五个。
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