Water Treatment And Methods

Step 1: Understanding the given data.
RO feed TDS concentration = 8000 ppm = 8000 mg/L
The recovery rate of the RO system is 70%, meaning 70% of the water is recovered as permeate, and 30% is rejected.
The RO unit removes 95% of the TDS.
Step 2: Calculate the TDS in the RO permeate.
The TDS removed by the RO unit is 95%, so the TDS concentration in the permeate is: This is equivalent to 400 mg/L.
Step 3: Calculate the TDS in the RO reject.
Since 30% of the water is rejected, and the TDS in the feed is concentrated, the TDS concentration in the reject will be: This is equivalent to 25.6 g/L (rounded off to one decimal place).
Step 4: Final answer.
The TDS in the RO reject is

Step 1: Understanding the given data.
RO feed TDS concentration = 8000 ppm = 8000 mg/L
The recovery rate of the RO system is 70%, meaning 70% of the water is recovered as permeate, and 30% is rejected.
The RO unit removes 95% of the TDS.
Step 2: Calculate the TDS in the RO permeate.
The TDS removed by the RO unit is 95%, so the TDS concentration in the permeate is: This is equivalent to 400 mg/L.
Step 3: Calculate the TDS in the RO reject.
Since 30% of the water is rejected, and the TDS in the feed is concentrated, the TDS concentration in the reject will be: This is equivalent to 25.6 g/L (rounded off to one decimal place).
Step 4: Final answer.
The TDS in the RO reject is