Abilities of Ecological Ditch to Purify Livestock Wastewater in Different Seasons

• Main Authors: WU Hua-shan, ZHAO Hui, HUANG Hong-ying, XU Yue-ding
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2018-03-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: season, ecological ditch, purification, livestock wastewater
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2018/3/20180308.htm

The aim of this paper is to study the effects of purification of low concentration farming wastewater in ecological ditch in different seasons. The results showed that:the reduction rates of COD and TN were more than 86%, and that of TN was more than 98% in summer and autumn. The ecological ditch was better than other treatments for nutrient reduction in summer, followed by autumn, then spring, winter was the worst. Even the aquatic plants were mowed, the ecological ditch still could play a certain purification effect. With the accumulation of ecological ditch running time,the nutrient contents in the sediment increased. Increase was the fastest in initial stage of ecological ditch, and but the concentration of three pollutants decreased sharply to the end of the ecological ditch with the extension of the ecological ditch, and the change in nutrient contents of sediment were insignificant. The biomass of the aquatic plants in the initial section of the ecological ditch was the highest, then decreased significantly along with the extension of the ecological ditch, and was the lowest at the end point. The amouts of N and P absorbed by aquatic plants accounted for 28% and 8.7% of the total reduction amonuts in the ecological ditch.