Sanitary Engineering Section, Public Works Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt.
Sci Rep. 2023 Nov 27;13(1):20785. doi: 10.1038/s41598-023-48129-x.
The water shortage problem in Egypt has promoted the exploration of new water resources, including the use of treated agricultural drainage water. This study aims to develop an efficient and cost-effective method for the in-situ treatment of agricultural drainage water from the Bahr-ElBaqar drain using a microalgae layer. The objective was to establish the optimal thickness of the layer for achieving the highest removal efficiency of pollutants from the drain's wastewater. Practical work was performed on a pilot consisting of five channels with four channels having microalgae with different thicknesses and fixed lengths of 50 cm, and the fifth channel acting as a buffer channel to assimilate the drain water without any treatment microalgae layer. After the experiment, it was discovered that a 10-mm layer of microalgae was the most effective thickness for eliminating pollutants from wastewater. The removal efficiencies were 29% for biochemical oxygen demand (BOD), 46.9% for chemical oxygen demand (COD), and 56.1% for total suspended solids (TSS) removal. This experiment provided evidence that microalgae could represent a viable solution for in-situ treatment of agricultural drainage wastewater with high removal efficiencies for pollutants in wastewater and decreased the need for constructing huge and expensive wastewater treatment plants.
埃及的水资源短缺问题促使人们探索新的水资源，包括利用经过处理的农业排水。本研究旨在开发一种高效且具有成本效益的原位处理方法，利用微藻层处理来自 Bahr-ElBaqar 排水的农业排水。目标是确定层的最佳厚度，以实现从排水废水中去除污染物的最高效率。实际工作是在一个由五个渠道组成的试验台上进行的，其中四个渠道具有不同厚度的微藻，长度固定为 50 厘米，第五个渠道作为缓冲区，将未经任何处理的微藻层处理的排水吸收进去。实验后发现，10 毫米厚的微藻层是去除废水中污染物的最有效厚度。生化需氧量（BOD）的去除率为 29%，化学需氧量（COD）的去除率为 46.9%，总悬浮固体（TSS）的去除率为 56.1%。该实验证明，微藻可以成为原位处理农业排水的可行解决方案，对废水中的污染物具有很高的去除效率，减少了建造庞大而昂贵的废水处理厂的需求。
