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采用水生植物滤池(U B和PU B)和固定膜生物滤池(SB)的复合净化模式,对鲍鱼养殖水体和系统排放水体进行净化,实现了循环水养鲍系统的清洁生产。试验结果表明,植物滤池U B对养殖水体中总氨氮(TAN)具有很高的吸收效率,从而降低了SB的硝化负荷,大大减少了TAN、NO2--N、NO3--N和COD的积累,在整个试验过程中,养殖水体中TAN、NO2--N、NO3--N和COD的浓度分别低于0.19、0.01、1.75和1.20 m g/L。由于U B滤池的吸收作用和SB的硝化作用,养殖水体中PO43-的浓度一直保持在0.30 m g/L以下。另外,这种复合净化模式具有调节水体pH值的作用,在试验期间,养殖水体中的pH值一直保持在8.11~8.14的良好水质范围,对鲍鱼的养殖十分有利。系统排放水经另一植物滤池PU B吸收净化后,PO43-浓度降至0.22 m g/L以下,NO3--N的浓度甚至降至0.10m g/L以下。本文还建立了养殖循环水体中无机氮的循环模型,用于对养殖水体中TAN、NO2--N和NO3--N的预测和控制。
The compound purification model of aquatic plant filter (U B and PU B) and fixed membrane biofilter (SB) was used to purify abalone farming water and system discharge water to realize the clean production of recirculating water conservation abalone system. The results showed that the plant filter UB had a high absorption efficiency for total ammonia nitrogen (TAN) in aquaculture water, thus reducing the nitrification load of SB and greatly reducing the accumulation of TAN, NO2 - N, NO3 - N and COD During the whole experiment, the concentrations of TAN, NO2 - N, NO3 - N and COD in the aquaculture water were lower than 0.19, 0.01, 1.75 and 1.20 mg / L, respectively. Because of the absorption of UB filter and the nitrification of SB, the concentration of PO43- in aquaculture water remained below 0.30 m g / L. In addition, this compound purification mode has the function of regulating the pH value of the water body. During the test period, the pH value of the breeding water body has been kept in the good water quality range of 8.11 to 8.14, which is very beneficial to abalone breeding. When the system discharge water is purified by PU B, another plant filter, the concentration of PO43- drops below 0.22 m g / L and the NO3 - N concentration drops below 0.10 m g / L. In this paper, a cycle model of inorganic nitrogen in aquaculture water was also established to predict and control TAN, NO2 - N and NO3 - N in aquaculture water.