WULing-yu,LIDa-peng,QUSi-tong,et al.Effects of P-nCaO2-BFS Recovered from Wastewater and Low Molecular Weight Organic Acids on Plant Growth[J].China Water & Wastewater,2024,40(19):9-15.
Effects of P-nCaO2-BFS Recovered from Wastewater and Low Molecular Weight Organic Acids on Plant Growth
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第19期
Page:
9-15
Column:
Date of publication:
2024-10-01
- Abstract:
- 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 nCaO2-BFS, the obtained phosphorus-containing precipitate, P-nCaO2-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-nCaO2-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-nCaO2-BFS into water within 16 h, and the release rates were 53.19%, 80.69%, and 97.06%, respectively. In the pot experiment, P-nCaO2-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-nCaO2-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, P-nCaO2-BFS has the potential to be applied as a slow-release phosphate fertilizer and can realize the resource utilization of phosphorus in wastewater.
Last Update:
2024-10-01