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季明东,李建平,叶章颖,朱松明.泡沫分离器去除养殖循环水中不同粒径细微颗粒物的效果[J].农业工程学报,2018,34(19):202-207.DOI:10.11975/j.issn.1002-6819.2018.19.026
泡沫分离器去除养殖循环水中不同粒径细微颗粒物的效果
投稿时间:2018-04-10  修订日期:2018-08-13
中文关键词:  养殖  颗粒物  循环水  泡沫分离  水力停留时间  进气量  粒径分布
基金项目:国家水体污染控制与治理科技重大专项课题(2014ZX07101);浙江省重大科技专项重点农业项目(2015C02010)
作者单位
季明东 浙江大学生物系统工程与食品科学学院杭州 310058 
李建平 浙江大学生物系统工程与食品科学学院杭州 310058 
叶章颖 浙江大学生物系统工程与食品科学学院杭州 310058 
朱松明 浙江大学生物系统工程与食品科学学院杭州 310058 
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中文摘要:为高效去除循环水养殖中的细微颗粒物,通过试验优化射流式泡沫分离器的水力停留时间和进气量,并结合相关理论研究分析不同粒径区间颗粒物的去除情况。以孔径125 μm转鼓式微滤机出水口的水体作为泡沫分离原样进行批处理试验,以颗粒物去除率为指标优化水力停留时间和进气量;以4个粒径区间≤10、?10~50、?50~90和?90 μm的颗粒物质量浓度变化率为指标分析各区间的颗粒物去除情况。养殖水中细微颗粒物在泡沫分离时,细化气泡和增加水力停留时间在提高去除率中会达到极值,水力停留时间和进气量对颗粒物去除率有显著影响,水力停留时间为2.0 min和进气量为1.3 L/min时,去除率较高为(34.06%±4.37%);泡沫分离对粒径≤90 μm的颗粒物都有较好的去除作用,且对粒径≤10和?50~90 μm的颗粒物去除率相对较高,而对粒径?90 μm的颗粒物去除较困难。
Ji Mingdong,Li Jianping,Ye Zhangying,Zhu Songming.Removing effect of fine particles with different sizes by foam fractionator in recirculating aquaculture system[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(19):202-207.DOI:10.11975/j.issn.1002-6819.2018.19.026
Removing effect of fine particles with different sizes by foam fractionator in recirculating aquaculture system
Author NameAffiliation
Ji Mingdong College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China 
Li Jianping College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China 
Ye Zhangying College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China 
Zhu Songming College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China 
Key words:aquaculture  particles  recirculating water  foam fractionation  hydraulic retention time  air inflow  particle size distribution
Abstract: In recirculating aquaculture system (RAS), the main solid wastes are uneaten feed, faeces and bacterial flocs. Solid wastes can decrease water quality and aquacultural benefit if without removed effectively. A higher removal efficiency of solid wastes is the guarantee for improving the environmental sustainability of RAS, and it will promote the development and utilization of RAS in China. The larger particles can be removed by settling basin, drum filter, swirl separator, and so on. But it’s difficult to remove fine particles accounting for 95% of total solid wastes smaller than 20 μm and the heterotrophic bacteria can use particulate organic matter for mineralization process. This process not only consumes oxygen, but also produces ammonia, which may aggravate the burden of biofilter for autotrophic nitrifying bacteria to remove ammonia and nitrite. For removing fine particles efficiently, Venturi type of foam separator was optimized by the testing of hydraulic retention time and the air inflow, and combined with relevant theory research, the removal situation of particles with different size ranges was analyzed. In this experiment, the water as original sample from the outlet of drum filter with microscreen mesh size of 125 μm was introduced for batch foam fractionation. The mass concentration of particles in the original sample was (30.33±4.54) mg/L, and the size of more than 98% of them was smaller than 10 μm. The removal efficiency of fine particles was applied as the index for optimization of hydraulic retention time and the air inflow. According to the particle size distribution of the original sample, all particles were divided to 4 size ranges, i.e. ≤10, >10-50, >50-90 and >90 μm, and their concentrations in original sample were (6.56±0.98), (8.68±1.30), (7.75±1.16) and (7.35±1.10) mg/L respectively. And the changing rate of fine particles’ concentration for each interval was applied as the index for analyzing the removal situation of particles with different size ranges. The results showed that the hydraulic retention time and air inflow had significant influences on the removal efficiency of fine particles. When the hydraulic retention time was 2.0 min and the air inflow was 1.3 L/min, the removal efficiency of fine particles was the highest, which was 34.06%±4.37%, and particles size range of the foam wastewater discharged from the foam separator was 1-300 μm, more than 95% of which was smaller than 10 μm. Foam fractionation had a good effect on removing the particles whose size was ≤90 μm, and the removal efficiency of the particles with the size of ≤10 and >50-90 μm was relatively higher than that of >10-50 μm, while it was difficult to remove the particles with the size of >90 μm. Removal efficiency can be increased to some extent with the decreasing of bubbles size and the increasing of hydraulic retention time, but there exists an extreme value, and it suggests that the design and operation of foam fractionation is determined by the nature of the particles and size distribution in the aquaculture water. For the sake of improving the fine particles removal efficiency of foam fractionation in RAS, the fractionation mechanism should be further studied, especially the properties of bubbles and particles, such as how to select the bubble size according to the properties and size distribution of particles in different operating conditions of RAS, and how to apply ozone, a kind of strong oxidizer that has been proved to be efficient for improving the removal of solids in actual RAS.
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