摘要
本文介绍工业废水经处理后利用于农业生产上的一个较好的研究例子. 亚硫酸钙法制浆废水经田间试验、处理和分析,结果为:该废水(1)不利于水稻种子发芽、育苗,但含25%废水有利于水稻生长;(2)不施化肥时,用于水田有明显增产效果.施化肥时,以含25%废水灌溉产量最高.废水中COD、BOD分别应控制在350～400mg/l和70～90mg/l为宜;(3)有利于改善土壤;(4)稀释至25%浓度为最佳利用效果,农作物既不受毒害又不会使品质下降.
The results of the field and pot culture experiments are as follows: (1) although the checking effect of acid-made pulp wastes on the germination of rice seeds, 25% wastewater well promotes the growth of the rice seedings after transplanting.(2)The wastewater remarkably increases the rice yield without chemical fertilizer. Maximum rice yield will be got with 25%wastewater and chemical fertilizer but the yield decreases with over 50% ones.(3)The wastewater can improve the physical properties of soil and increases the content of nutrients and organic substances in soil.(4)The optimum concentration of the wastewater is diluted to 25%, in which the contents of heavy metals arc below the GB standard
出处
《环境污染与防治》
CAS
1988年第3期5-10,14+46,共8页
Environmental Pollution & Control
