Acceptable Effluent yet High Chemical-and-Water Consumption: Pay Attention to Hidden Operating Anomalies

Introduction

Under certain working conditions, all effluent indexes meet specifications, but acid-alkali consumption and post-regeneration rinsing-water consumption keep rising, namely reduced operating economic indicators. This type of problem does not directly cause water-quality non-compliance and is frequently overlooked. Long-term operation brings unnecessary consumption of chemicals and water and serves as an early warning signal of equipment hazards.

Main Text

Key characteristics:

1. Regenerant specific consumption persistently exceeds design reference ranges;

2. Extended rinsing time after regeneration, resulting in elevated rinsing-water consumption;

3. Acid-alkali consumption per ton of produced water is obviously higher than process reference values.

Common causes:

1. Resin fouled by colloids and organics; large-volume impurities need elution during regeneration, increasing chemical and rinsing-water demand;

2. Improper setting of regeneration-process parameters: inappropriate regeneration flow rate or concentration;

3. Severe resin breakage, elevated bed resistance, biased regenerant flow and insufficient contact between regenerant and resin, lowering chemical utilization efficiency;

4. Resin-bed disorder under counter-current regeneration conditions, reducing regeneration efficiency.

Deteriorated operating economic indicators often represent early warning signs of resin or equipment problems. Without timely intervention, substantial faults in effluent quality and cyclic capacity are likely to occur subsequently.

Summary

Operation-and-maintenance work shall not focus merely on effluent indexes. Periodically count regenerant and water consumption to identify hidden hazards at an early stage.