WASTEWATER TREATMENT CAPACITY FOR INTENSIVE SHRIMP POND EFFLUENT USING FISHING NET FILTER MATERIALS

Abstract

This study aims to test  the potential use fishing nets for treating wastewater from intensive whiteleg shrimp (Litopenaeus vannamei) ponds.  The study was conducted at a laboratory scale using a custom-built experimental model. This research used K₃ media (biofilm surface area > 2,900 m²/m³) to test treatments with and without aeration. Its performance was then compared with that of fishing net material (HDPE fiber, 3 × 3 cm mesh, density 150 kg/m³) under both aerated and non-aerated conditions. This research used one pilot in which each treatment unit had a volume of 6.4 L. One unit contained 50% K₃ media, while another contained 89.2% fishing net material by volume. The study results showed that parameters including DO, pH, salinity, alkalinity, turbidity, H₂S, BOD₅, COD, TSS and coliforms in all four treatments met the Vietnamese standard QCVN 02-19:2014/BNNPTNT. However, ammonia (NH₃) concentrations slightly exceeded the permissible limit in all four treatments, highlighting the need for enhanced ammonia removal. Treatment 1 (fishing net without aeration) was selected for application in real wastewater treatment.