不同用量的呼吸环和陶瓷环处理养殖废水中氨氮的效果

采用挂膜法在曝气式生物滤池中比较分析不同用量的呼吸环和陶瓷环处理养殖废水时NH_4~+-N,NO_2~--N的质量浓度变化,并构建浓度变化模型公式。结果表明,不同生物滤料、不同用量的NH_4~+-N质量浓度均随处理时间延长而逐渐下降,NO_2~--N质量浓度先上升至峰值然后下降。14%红色呼吸环、10%红色呼吸环NH_4~+-N和NO_2~--N处理效果最优,处理的第21~23天NH_4~+-N达最低值(0.056±0.014)mg·L~(-1),去除率为97.37%;处理的第10天NO_2~--N达到峰值(1.722±0.014)mg·L~(-1),第24~26天达最低值(0.024±0.009)mg·L~(-1)。不同比例不同生物滤料NH_4~+-N去除效果满足模型公式y=a/(1+be~(cx))+d,NO_2~--N去除效果满足模型公式y=x~ae~((b/x+cx))+d。

Effect of Breathing Loops and Ceramic Rings at Different Ratios on the Removal of NH4 +-N in the Wastewater from the Aquaculture

Red breathing silica loops and white ceramic rings were placed in the aerated biofilter to observe their removal of NH4 +-N and NO2--N from the wastewater in the aquaculture of Portunus trituberculatus by using the biofilm formation method.Mathematical models were set up for the changes of NH4 +-N and NO2--N concentration in the wastewater.The results showed that the NH4 +-N concentration descended gradually with time in both the breathing silica loops and the white ceramic rings at different ratio while the NO2--N concentration rose to the peak and then decreased.The red breathing silica loops at the ratio 14％ and 10％ had the highest removal rate of NH4 +-N and NO2-N.They reduced the NH4 +-N concentration of the wastewater to 0.056 ±0.014 mg · L-1 with a removal rate of 97.37％ at days 21-23 after treatment;the NO2-N concentration rose to the peak (1.722 mg·L-1 ±0.014 mg · L-1) at day 10 after treatment and decreased to the lowest (0.024 ±0.009 mg · L-1) at days 24-26.The concentration of NH4 +-N (y) in the wastewater fits the model of y =a/(1 + becx) + d and that of NO2--N (y) fits the model y =xa e(b/x+cx) + d for the biofiltering mateials at different ratios.