ABSTRACT:- Shrimp farming is a major industry in Indonesia, contributing significantly to the economy but also posing environmental risks due to untreated wastewater discharge. This study aims to evaluate the operational processes, pollutant reduction efficiency, and potential improvements of the wastewater treatment plant (WWTP) at CV. TDB, a shrimp farm located in East Belitung, Indonesia. The method used was field observation and comparison with wastewater treatment theory and applicable quality standards. The TDB pond WWTP consists of a series of sedimentation ponds and biological treatment using Chanos chanos (milkfish) to aid in the breakdown of organic matter. Water quality parameters such as pH, ammonia (NH₃ ), nitrite (NO₂ -), nitrate (NO₃ -), and phosphate (PO₄ ³⁻ ) are monitored twice a year to assess compliance with local environmental regulations. The results showed that the WWTP system met local regulatory standards for pH (7.30-8.41) and ammonia (0.087 mg/L), but its efficiency in reducing nitrogen and organic matter was suboptimal due to the lack of sophisticated treatment processes. Despite complying with environmental limits, the system’s reliance on natural sedimentation and filtration limits its ability to manage pollutants consistently across a range of environmental conditions. Recommendations to improve the effectiveness and sustainability of the system include the introduction of secondary and tertiary treatment technologies, increased monitoring frequency, and the implementation of more frequent maintenance protocols. These improvements will enhance the operational efficiency of the WWTP, ensure long-term regulatory compliance, and reduce the environmental impact of shrimp farming operations. This study provides valuable insights into wastewater management in aquaculture and highlights the need for technological improvements to achieve sustainable production.

Keywords – Shrimp farming, Wastewater Treatment Plant, Nitrogen, Organic matter, Natural sedimentation