竹浆废水酸析固废农用处理初步研究

Agricultural utilization of solid waste from treating bamboo soda pulping waste water

竹浆废水酸析处理后产生以木质素为主要成分的固体废物。通过室内试验与盆栽试验,研究了竹浆废水酸析处理过程中产生的酸析固废与磷矿粉混合进行农业利用处理,并对处理效果进行分析。结果表明,将磷矿粉与酸析固废混合可有效地中和酸析固废中的游离酸,反应时间需要4 d以上。酸析固废能部分活化磷矿粉中的磷,提高磷的有效性。酸析固废与磷矿粉以质量比为1∶1混合4 d后活化效果最佳。对酸析固废活化磷矿粉中磷的机理研究表明,酸析固废中的残留酸是磷活化的主要因子。小白菜(Brassica campestrisssp.chinensisL.)和萝卜(Raphanus sativusL.)盆栽试验结果表明,经酸析固废活化后的磷矿粉有一定肥效,肥效介于磷矿粉与钙镁磷肥之间。

Bamboo soda pulping waste water produces a great quantity of solid waste in the process of acidification. The main component of the solid waste is lignin. Agricultural utilization of the solid waste was conducted in the lab and pot experiments. The results showed that rock phosphate could effectively neutralize the free acid in the solid waste to,enhance the pH to a suitable level for the agricultural use. Rock phosphate and solid waste should be mixed at the ratio of 1 ： 1 and the mixture should be stored more than 4 d to reach the highest activating efficiency. Further study showed that phosphorous in rock phosphate was predominantly activated by free acid. The result of pot experiment indicated that the nutritional effect of the mixture of sohd waste and rock phosphate on the growth of radish （Raphanus sativus L. ） and Chinese cabbage （ Brassica campestris ssp. chinensis L. ） was between rock phosphate and calcium magnesium phosphate.