农业工程学报Issue(11)：243-248,6.DOI:10.11975/j.issn.1002-6819.2015.11.035
适宜牡蛎与龙须菜配比提高含氮养殖废水处理效果
Optimal ratios of oyster toGracilaria improving removal efficiency of nitrogen nutrients in aquaculture wastewater
摘要
Abstract
Currently, intensive marine aquaculture has been widely adopted to obtain higher yields of aquatic food production. However, the effluent unfiltered wastewater, including organic and inorganic nitrogen and phosphorous can damage the physiology of farmed species and cause hyper-trophication of adjacent ecosystems. Using bivalve mollusc and macroalgae to purify wastewater before discharged is gaining extensive attention due to their cost effect and efficient features. The present study was conducted to investigate the effectiveness of an oyster-Gracilaria system. The study focused on the effects of Gracilaria lemaneiformisdensities and Crassostrea gigas toGracilaria lemaneiformis ratios. This experiment contained two parts. In the first part, four densities ofGracilaria (0.8, 1.6, 2.4 and 3.2 g/L) were set up. The results showed that all the four treatments had a low total ammonia nitrogen removal rate (less than 40%) before 48 h. However, treatments of 2.4 g/L and 3.2 g/L had a relative high TAN removal rate in 60 h (54.34% and 67.70%, respectively), 72 h (39.77% and 48.27%, respectively).Gracilaria of 1.6 g/L and 2.4 g/L removed relative more NO2-N in 6 h (56.64% and 55.26%), and in 12 h. In comparison, 2.4 g/L had a significant higher (P<0.05) NO2-N removal rate (57.33%) than other groups. Significant difference (P<0.05) of NO3-N removal rate occurred in 6, 18 and 72 h, with the highest removal rate in sets of 3.2 g/L (11.72%), 2.4 g/L (15.65%) and 2.4 g/L (7.61%), respectively. In the second part, a two-factor experiment was designed. Three gradient densities of oyster (1.6, 2.4, 3.2 g/L) andGracilaria were set up and combined to each other. Results showed that 2.4 g/L oyster and 2.4 g/LGracilaria lemaneiformis combination had higher NO2-N removal rate (40.29%) than other treatments. There were significant (P<0.05?) interaction on TAN removal efficiency between the densities of oyster andGracilaria lemaneiformis and Gracilaria lemaneiformis played a leading role (Gracilaria of 2.4 g/L removed 74.44% of TAN). The combination of 2.4g/L oyster and 1.6g/L Gracilaria lemaneiformis had better NO3-N removal rates, while there was no significant (P>0.05) difference withGracilaria lemaneiformis of 2.4 g/L. Therefore, both oyster andGracilaria lemaneiformis had the best efficiency in treating wastewater at the density of 2.4 g/L (Oyster:Gracilaria=1:1).关键词
养殖/废水/N去除/牡蛎/龙须菜/数量配比/大西洋鲑Key words
aquaculture/wastewater/nitrogen removal/Crassostrea gigas/gracilaria lemaneiformis/ratio/Atlantic salmon分类
农业科技引用本文复制引用
李甍,宋协法,孙国祥,马晓娜,刘鹰..适宜牡蛎与龙须菜配比提高含氮养殖废水处理效果[J].农业工程学报,2015,(11):243-248,6.基金项目
国家科技支撑计划课题（2011BAD13B04），国家自然科学基金（31472312，41306152，31402283），青岛市创新创业人才计划（13-CX-16）。 （）
