HazenFilter is a groundbreaking model that can simulate complex biofiltration (BAF) systems along with conventional filters. It's a powerful way to explore how a wide range of designs and conditions could impact filter performance without having to physically test each one.

Utilities can use HazenFilter to predict how well filtration systems will remove organics and nutrients at specific sites. All they need to do is calibrate it using historical data and details about their operations and filter designs. 

The model can be calibrated using historical operational data, the design of the filter and filter media, and protocols for backwashing (cleaning the filter by pushing clean water back through it).

The earliest version of the tool was developed by engineers from Hazen and Sawyer and Virginia Tech. They designed it using decades of knowledge about the complex biological, chemical, and physical processes involved in BAF, along with data shared by Hampton Roads Sanitation District and Newport News Waterworks. The initial results for the model were published in the journal Water Research. Today, we're actively using this first-of-its-kind tool to help clients achieve their filtration goals.

Media properties

Turbidity/ TSS

Cleaning Protocols

Temper- ature

Filter Design

Headloss

Operational Data

Nutrients & organics 

Headloss trigger

OUTPUTS

Denitrification

Unit Filter Run Volume

INPUTS

Filter runtime trigger

Biofilm growth

Surface loading rate

Runtime (hours)

Filter dimen- sions

Cloudiness of water caused by tiny particles or suspended solids

Carbon (MeOH) dosage

NO3 removal

Headloss

About HazenFilter

Effluent Turbidity/TSS

Volume of water pushed through a filter per square foot before it needs cleaned 

How much time can pass before filter needs cleaned

HazenFilter DECIDE WITH CONFIDENCE

About HazenFilter

Headloss trigger

Runtime (hours)

Total Organic Carbon

Nutrients & organics  (if available)

Disinfectants (upstream chlorination or oxidation)

Filter runtime trigger

Effluent Turbidity

TOC removal %

HazenFilter DECIDE WITH CONFIDENCE

Turbidity