Supposing the area of fishpond is 1000m2 and 0.8m deep, the volume of aeration tank and sedimentation tank, time of aeration, quantity of atmosphere needed, quantity of increased sludge were caculated.

• 取封闭式循环水鱼类养殖水面1000mZ，水深按0.；8m，进水BODS浓度So设为55m留L，出水BODS浓度Se为4m妙的设计计算了曝气池容积、曝气时间、曝气所需空气量、污泥增长量及二次沉淀池容积。