This work was executed to design and construct a scale plant as part of a water treatment process by combining filtration and disinfection in one unit, using the local medium of sand, and a Pulse Electric Field-Low Voltage (PEF-LV). The Existing Rapid Sand Filtration (ERSF) is a purely physical method of drinking water purification. Biofilm formation takes place in the sand medium and comprises three steps i) bacterial cells settle onto the sand medium, ii) cells proliferate and secrete adhesive Extracellular Polymeric Substrates (EPS) and iii) cells detach and spread the biofilm to new locations, forming a soapy substance. In this study, we attempted to modify the ERSF by overcoming the drawbacks, in terms of the quality of the filtered water, EPS removal, as well as ease of operation–maintenance to make it more sustainable. The Disinfectant of Rapid Sand Filter (DRSF) incorporates the Pulse Electric Field-Low Voltage through the electrodes between the media. The experiments were done over the period from December 2019 to July 2020, at 8 hr/day as the running time The effectiveness of the various operational conditions of the DRSF and their findings were also analyzed, together with the observational, experimental and theoretical basis. The results showed that the optimum conditions for better performance of the DRSF include 30V, 3 pulses/second, AC pulse frequency, 50Hz, two pairs of electrodes in the sand medium, 100 L/hr influent flow rate, and parallel connection. Backwashing requirements for the ERSF was necessary every day, but in DRSF it was only once in every 7 days, at the same influent flow rates of 100 L/hr. Therefore, as the DRSF is to be backwashed less frequently, the operation and maintenance difficulties will be greatly minimized. The EPS, which was produced by the bacteria, was responsible for clogging the medium and causing the necessity to backwash every day in the ERSF. This microbial biomass reduced the pore space in the medium and increased the head loss.

这项工作的进行是为了设计和建造一个规模化工厂，作为水处理过程的一部分，该过程是通过使用局部沙子介质和低压脉冲电场（PEF-LV）将过滤和消毒组合在一个单元中来进行的。现有的快速砂滤（ERSF）是纯净的饮用水净化方法。生物膜的形成发生在沙子介质中，包括三个步骤：i）细菌细胞沉降到沙子介质上； ii）细胞增殖并分泌粘附性细胞外聚合物基质（EPS）； iii）细胞分离并将生物膜扩散到新的位置，形成一个肥皂性物质。在本研究中，我们试图通过克服缺点来对ERSF进行修改，这些缺点包括过滤水的质量，EPS的去除以及易操作性维护，以使其更具可持续性。快速砂滤器消毒剂（DRSF）通过介质之间的电极结合了脉冲电场低电压。实验在2019年12月至2020年7月的8小时/天的运行时间内进行。还分析了DRSF的各种运行条件的有效性及其发现，以及观察，实验和理论基础。结果表明，DRSF更好性能的最佳条件包括30V，3脉冲/秒，AC脉冲频率，50Hz，砂介质中的两对电极，100 L / hr的进水流量以及并联。每天需要对ERSF进行反冲洗，但是在DRSF中，每7天只有一次，并且进水流量为100 L / hr。因此，由于减少了对DRSF的反洗次数，因此将极大地降低操作和维护难度。由细菌产生的EPS导致培养基堵塞并导致每天在ERSF中反冲洗的必要性。这种微生物生物量减少了介质中的孔空间并增加了水头损失。