污水中回收P-nCaO_(2)-BFS协同有机酸对植物生长影响  

Effects of P-nCaO_(2)-BFS Recovered from Wastewater and Low Molecular Weight Organic Acids on Plant Growth

作　　者：吴玲予 李大鹏[1] 曲思彤 黄勇[1] WU Ling‑yu;LI Da‑peng;QU Si‑tong;HUANG Yong(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]苏州科技大学环境科学与工程学院,江苏苏州215009

出　　处：《中国给水排水》2024年第19期9-15,共7页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51778393)。

摘　　要：从污水中回收磷酸盐并资源化利用成为了近年来的研究热点。在利用一种新型复合材料nCaO_(2)-BFS从污水中回收磷酸盐的基础上,将得到的含磷沉淀物P-nCaO_(2)-BFS作为缓释磷肥施用。由于nCaO_(2)-BFS回收的多为难溶性钙磷沉淀,进一步探讨了添加低分子质量有机酸对其释磷能力的影响。结果表明,P-nCaO_(2)-BFS可在水中缓慢且稳定地释放磷酸盐,并能够抑制土壤中水分的流失。同时,12、16和20 mmol/L的柠檬酸溶液能使P-nCaO_(2)-BFS在16 h内向水中更加快速且充分地释放磷酸盐,释放率分别达53.19%、80.69%和97.06%。在盆栽实验中,P-nCaO_(2)-BFS能够增加土壤有效磷、速效钾、全氮以及有机质的含量,促进鸡毛菜生长。而添加柠檬酸溶液后,21 d内P-nCaO_(2)-BFS向土壤中释放磷酸盐的速率明显提高,49 d后土壤有效磷、速效钾和有机质的含量较空白组分别增加了64.02%~127.37%、3.40%~11.59%和6.36%~9.43%,单株鸡毛菜的株高、干质量和鲜质量较空白组分别增加了6.1~9.4 cm、12.33~15.52 g和0.44~0.68 g,生长情况较为优秀。因此,P-nCaO_(2)-BFS具有作为缓释磷肥施用的潜力,能够实现污水中磷的资源化利用。The efficient recovery and recycling of phosphate from wastewater has become a research hotspot in recent years.Based on the phosphate recovery from wastewater using a new composite material called nCaO_(2)-BFS,the obtained phosphorus‑containing precipitate,P-nCaO_(2)-BFS,was utilized as a slow‑release phosphate fertilizer.Since the residue consisted of insoluble calcium-phosphorus precipitates,the impact of low molecular weight organic acids on the phosphorus release capacity of the precipitate was investigated.The results showed that P-nCaO_(2)-BFS could release phosphate slowly and steadily in water and inhibit water loss in soil.The citric acid solution with 12 mmol/L,16 mmol/L,and 20 mmol/L could accelerate phosphate release from P-nCaO_(2)-BFS into water within 16 h,and the release rates were 53.19%,80.69%,and 97.06%,respectively.In the pot experiment,P-nCaO_(2)-BFS increased the availability of phosphorus,potassium,total nitrogen,and organic matter content in the soil and promoted the growth of Brassica rapa L..The addition of citric acid solution significantly increased the rate of phosphate release from P-nCaO_(2)-BFS within 21 days.Compared with the control group,the contents of available phosphorus,available potassium,and organic matter in soil were increased by 64.02%-127.37%,3.40%-11.59%,and 6.36%-9.43%after 49 days.And the plant height,dry weight,and fresh weight of a single plant increased 6.1-9.4 cm,12.33-15.52 g,and 0.44-0.68 g.Therefore,PnCaO_(2)-BFS has the potential to be applied as a slow‑release phosphate fertilizer and can realize the resource utilization of phosphorus in wastewater.

关 键 词：磷回收 缓释磷肥 鸡毛菜 有机酸 

分 类 号：TU992[建筑科学—市政工程]