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城市工业废水和生活污水的排放量逐年增多,这些污水中含有大量的肥料.据测定,鞍山南部污水含氮量为40毫克/升,磷为14.4毫克/升,钾为13.4毫克/升.污水中还含有大量的有机质,能使土质保持疏松,提高土壤肥力.因此,污水灌溉能促进农作物增产.但是,污水中含有一些有害的化学物质,如氰化物、硫化物、酚、砷、汞、铬、铅、油酯等,不仅影响农作物生长发育,更严重的是危害人体健康.因此,污水灌区必须十分重视水质的调节工作,兴其利而避其害.
Municipal industrial wastewater and domestic sewage emissions increased year by year, the sewage contains large amounts of fertilizers.According to the determination, southern Anshan southern sewage nitrogen content of 40 mg / l, phosphorus was 14.4 mg / l, potassium was 13.4 mg / l. However, the sewage contains some harmful chemicals, such as cyanide, sulfide, phenol, arsenic, mercury, mercury and other pollutants, which can cause the increase of soil fertility, Chromium, lead, oil esters, etc., not only affect the crop growth and development, more serious is endangering human health.Therefore, the sewage irrigation area must attach great importance to the regulation of water quality, rejuvenate its benefits.