Client Background
Our client is a state-owned factory located in Surabaya, Indonesia. The factory specializes in shrimp processing and generates a significant amount of wastewater during the shrimp washing process. The client aims to treat this wastewater to achieve a quality suitable for recycling, thereby addressing the issue of water scarcity in the region.
Project Overview
The wastewater generated from shrimp washing contains high levels of contaminants, making it unsuitable for direct reuse. Even after preliminary treatment, the water quality remains poor, with a Total Dissolved Solids (TDS) level of approximately 4000 ppm. However, for the water to be recycled, the TDS must be reduced to below 100 ppm. To achieve this, a comprehensive water treatment system was designed, incorporating multiple stages of filtration and purification.
Water Quality Analysis
- Initial TDS: 4000 ppm (after simple wastewater treatment)
- Target TDS: <100 ppm (for recycling purposes)
Treatment Process
Given the high TDS levels and the need for extensive purification, the treatment process was designed to include the following stages:
- PAC (Polyaluminum Chloride) Chemical Treatment: Used to coagulate and remove suspended solids and organic matter from the wastewater.
- Multi-Media Filtration: This stage involves the use of multiple layers of filtration media (such as sand, gravel, and anthracite) to remove larger particles and further reduce turbidity.
- Activated Carbon Filtration: Activated carbon is used to adsorb organic compounds, chlorine, and other impurities that may affect the taste, odor, and color of the water.
- Dosing System: Chemicals are added to adjust the pH and to prevent scaling and fouling in the subsequent filtration stages.
- Ultrafiltration (UF): UF membranes are used to remove fine particles, bacteria, and viruses, achieving a high level of purification with a recovery rate of 90%.
- Reverse Osmosis (RO): The final stage involves RO membranes, which remove dissolved salts and other contaminants, reducing the TDS to the desired level of 80 ppm. The RO system has a recovery rate of 65%.
System Design and Flow Diagram
- Shrimp Farm Wastewater Pool: The wastewater is collected in a pool before being pumped into the treatment system.
- PAC Chemical Treatment: The wastewater undergoes coagulation and flocculation to remove suspended solids.
- Multi-Media Filtration: The water passes through multiple layers of filtration media to remove larger particles.
- Activated Carbon Filtration: Organic compounds and chlorine are adsorbed by the activated carbon.
- Dosing System: Chemicals are added to adjust the pH and prevent scaling.
- Ultrafiltration (UF): Fine particles, bacteria, and viruses are removed by the UF membranes.
- Reverse Osmosis (RO): Dissolved salts and contaminants are removed, achieving the desired TDS level.
- Pure Water Tank: The treated water is stored in a pure water tank for reuse in the shrimp washing process.
Project At Site
- Capacity: 25,000 liters per hour (L/H)
- Inlet Water Quality: 4000 ppm TDS
- Purified Water Quality: 80 ppm TDS
- UF Recovery Rate: 90%
- RO Recovery Rate: 65%
- Power Supply: 380V, 50Hz, 3-Phase
Conclusion
This comprehensive water treatment system ensures that the wastewater generated from shrimp washing is effectively treated and recycled, addressing both environmental concerns and the client’s need for sustainable water use. By combining chemical treatment, multi-media filtration, activated carbon filtration, ultrafiltration, and reverse osmosis, the system achieves the required water quality for recycling, with a final TDS of 80 ppm. This project not only helps the client reduce water consumption but also contributes to the sustainable management of water resources in the region.
System Specification
- Capacity: 25,000 L/H
- Inlet Water Quality: 4000 ppm TDS
- Purified Water Quality: 80 ppm TDS
- UF Recovery Rate: 90%
- RO Recovery Rate: 65%
- Voltage: 380V, 50Hz, 3-Phase
