Construction and Application of Electrocoagulation and Filtration Linkage Control System in Recirculating Aquaculture System----South China Sea Institute of Oceanology Chinese Academy of Sciences

Construction and Application of Electrocoagulation and Filtration Linkage Control System in Recirculating Aquaculture System

Source：IOCAS

13 01, 2022

Source：IOCAS 01 13, 2022 | 【 A A A 】 | 【Print】【Close】

Total suspended solids (TSS) are a major factor in reducing water quality in recirculating aquaculture systems (RAS).

Dr. XU Jianping of the research team led by Prof. SUN Jianming at Institute of Oceanology, Chinese Academy of Sciences (IOCAS), constructed an electrocoagulation diameter increasing reactor and microscreen drum filter (EDIR-MDF) linkage control system, and investigated its application in the RAS of Litopenaeus vannamei.

The study was published in Journal of Water Process Engineering (https://doi.org/10.1016/j.jwpe.2021.102379).

In the present study, electrocoagulation (EC) was used for the first time to increase the particle size of TSS in RAS and improve the filtration efficiency of the microscreen drum filter (MDF) without reducing the filtration pore size.

Researches suggested that total suspended solids (TSS) are the major factors that reduce water quality in a recirculating aquaculture system (RAS). The TSS with small particle size in traditional RAS is easy to accumulate, resulting in excessive ammonia and nitrite nitrogen, which limits the aquaculture capacity in RAS.

The working principle of the EDIR-MDF linkage control system is that the output current of EDIR (IEDIR) was feedback controlled by the backwashing interval period of MDF (TMDF). The relationship between TMDF and IEDIR was obtained:

When the aquaculture water was treated using an electrocoagulation diameter increasing reactor (EDIR) for 2 min, with current density at 50 A/m2 and influent flow at 300 L/h, the D50 of TSS increased by 86.43%.

In addition, results showed that the EDIR-MDF linkage control system increased the average removal efficiency of RAS for TSS, chemical oxygen demand (COD), ammonia, and nitrite by 24.07%, 24.30%, 8.94%, and 1.39%, respectively, and resulted in average energy consumption and anode loss of EDIR of 2.38 kWh/d (1.68 RMB/d) and 370 g/d (2.22 RMB/d). EDIR-MDF linkage control system can significantly increase the water quality of the aquaculture pond.

The work was supported by the National Key R&D Program of China, the Science and Technology Major Project of Guangxi, the Key Research and Development Program of Shandong Province and the China Postdoctoral Science Foundation.

Fig. 1 Schematic diagram of the experimental system

Fig. 2 Comparison of TSS particle size between influent (A) and effluent (B) of EDIR in the laboratory-scale system

Fig. 3 Pictures of aquaculture pond in no-EC stage (A) and EC stage (B)

Xu, J., et al. Construction and application of an electrocoagulation and filtration linkage control system in a recirculating aquaculture system. Journal of Water Process Engineering, 2021, 44, 102379. https://doi.org/10.1016/j.jwpe.2021.102379.

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