Optimizing Water Reuse and Chemical Discharge Reduction in Biofuel Production

Case Study Summary

This case study examines how a Midwest biofuel facility achieved aggressive water reuse goals while reducing chemical discharge by more than 30%. By leveraging Apex’s WaterSim™ modeling platform and implementing targeted process and chemistry optimizations, the facility reduced freshwater demand, improved system efficiency, and enhanced regulatory compliance.

Biofuel production facilities operate complex water systems that must balance production demands, discharge limits, and sustainability goals. Increasing pressure to reduce water usage and chemical discharge has driven many facilities to evaluate reuse opportunities — often requiring detailed system modeling to avoid unintended operational consequences.

A Midwest biofuel producer set internal targets to reduce both freshwater consumption and wastewater discharge while maintaining stable production. The facility partnered with Apex to evaluate its existing water balance, identify reuse opportunities, and implement a data-driven optimization strategy using WaterSim™.

Results at a Glance

Facility Background

• Industry: Ethanol/Biofuels
• Application: Process Water Optimization
• Operational Focus: Water reuse, sustainability, and ZLD planning
• Apex Solution: WaterSim™ Water System Modeling and Optimization Program

The plant was operating under extreme water stress driven by a zero liquid discharge plan. Excessive water recycle and retreatment were creating inefficiencies across fermentation, distillation, and cooling operations. Leadership needed a solution that could reduce water and chemical usage while supporting long-term compliance and sustainability goals.

The Challenge

The facility faced several interconnected challenges:

• Excessive water recycle and retreatment due to ZLD constraints

• Increasing chemical discharge and associated costs

• Elevated sulfates impacting cooling system performance

• Infrastructure limitations creating process bottlenecks

• Difficulty balancing reuse goals with operational efficiency

These issues were limiting the plant’s ability to maximize yield while maintaining sustainable operations.

The Apex Solution

Working closely with the plant’s local team, Apex specialists conducted a comprehensive evaluation of water flows and process interactions. Using Apex’s proprietary WaterSim™ program, the team modeled system behavior to identify opportunities for improvement across the plant.

Key elements of the solution included:

• Detailed mapping of water flows and reuse pathways

• Identification of pinch points driving recycle and retreatment

• Targeted recommendations to improve water quality entering critical processes

• Optimization strategies to reduce downtime and improve yields in fermentation and distillation

• Alignment of water management practices with sustainability and compliance goals

This data-driven approach enabled informed decision-making without requiring immediate infrastructure expansion.

Results & Operational Impact

Following implementation of WaterSim™-driven recommendations, the facility achieved measurable improvements:

• Cooling tower cycles increased from 8 to 13, reducing makeup water demand and saving energy

• Chemical discharge was reduced by well over 30%, lowering operating costs

• Sulfate levels decreased while corrosion rates in the cooling system improved

• Equipment longevity was extended through improved water chemistry control

• The plant advanced its water reuse and sustainability objectives while maximizing ROI

Together, these improvements delivered both immediate cost savings and long-term operational resilience.

Applicable To

This solution is relevant for:

• Biofuel and ethanol production facilities
• Plants seeking to reduce water use and chemical discharge
• Facilities evaluating reuse but lacking system-level visibility
• Operations operating under tightening regulatory constraints

Conclusion

This Midwest biofuel plant’s success demonstrates the power of combining system-level modeling with practical operational expertise. By leveraging WaterSim™, Apex helped the facility overcome infrastructure limitations, reduce water and chemical usage, and move confidently toward its sustainability goals.

For biofuel producers navigating water reuse, ZLD planning, or system optimization challenges, Apex delivers insight-driven solutions that turn complexity into opportunity.

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