Abstract:
The seawater desalination using Reverse Osmosis (SWRO) has overcome the
increasing potable demand in Untung Jawa Island. However, the drawbacks are
linked to high operational and maintenance requirements. The decline of seawater
ecosystem harmony around the intake pump and brine discharge area also worsens.
Thus, the reuse of treated sewage (TS) blended with seawater (SW) intake for
decreasing feed water pollutant load is becoming a viable option to tackle this
problem from the source. The digital simulation for SWRO modeling was necessary
to be carried on due to time and cost efficiency, plant availability, and experiment
complexity. The study’s objectives are to validate the simulation software, predict
the potential improvement of SWRO by intake blending model, and determine the
best intake blending scenario that suitable for SWRO Untung Jawa Island. The
method of this study is based on secondary data collection and digital data processing
to simulate existing condition, potential plant integration, and ten variations of intake
blending using WAVE Design Software. It continued with the plot-graph and
reduction percentage data analysis of SWRO variables from intake blending model.
The output shows that existing condition result from software simulation is in the
range of secondary data. Plant distance and capacity make the plant integration
possible; however, the additional utilization of Sewage Treatment Plant (STP)
advanced treatment is required. Through the intake blending model, the higher
percentage of TS has potentially reduce SWRO technical variables. The study
concludes that WAVE Design Soft are was applicable for SWRO digital modeling.
The intake blending model is expected to improve SWRO performance and seawater
ecosystem harmony. The best SW:TS percentage for SWRO Untung Jawa Island
intake is 70:30 (15.97:6.85 m3/h) with potential reduction of 30% brine rate and 19%
brine TDS, 40% seawater intake rate, 13.9% overall feed water rate, 32.8 RO energy
consumption.
