Using PHREEQC for laboratory and industrial applications

Julien Declercq, Ph.D

SRK Consulting

Rob Bowell, Ph.D

SRK Consulting

Workshop Need

This day and half workshop will provide an introduction to geochemical modelling and the USGS geochemical / thermodynamic modelling code PHREEQC (PH, REdox, EQuilibrium, Code). PHREEQC is a free, well-supported software code and one of the most, if not the most, widely used code amongst academia and industry for thermodynamic modelling applications.

During the workshop, we will present the different geochemical modelling steps, from the definition of a conceptual model to the geochemical calculations within PHREEQC. We will also present exercises drawn from the presenters’ experiences, both in a laboratory setting and applied industrial setting.

Target Audience

This course is intended for students, researchers, and professionals using or planning to use PHREEQC to model and predict the results of geochemical operations, from simulation of laboratory experiments to natural settings (such as groundwater interaction with bedrock, simulating field data and predicting water quality).

Attendees are encouraged to bring with them their own examples of natural or laboratory systems that they wish to model for discussion with the session tutors.

Short Workshop Programme

The workshop will take place in three sessions split over two days.

In the first session we will provide an introduction to geochemical models, the conceptualisation of the problems, and an overview of the thermodynamics that govern PHREEQC and the definitions within the databases. We will make a point of discussing the thermodynamic databases available within PHREEQC, their issues and the possible ways to overcome these.

Over the second session we will provide the basic skills needed to use PHREEQC, including the definition of inputs and outputs, of solid and aqueous solutions, and of reactions and equilibrium calculations.


The third session will provide a more in-depth look at the possibilities offered by PHREEQC in terms of kinetic, transport, and sorption calculations. The aim is to develop an understanding of how to extract the equations defining the reactivity of mineralogical phases from the literature or experimental data and integrate these into PHREEQC. We will then show you how to use sorption experiments to define attenuation equations and sorption blocks in the program and provide an introduction to transport simulations.

The workshop will finish with a general discussion.

Date: July, 13-14, 2019

Minimum: 20 delegates,

Maximum: 30 delegates


  • Regular €275/€300,

  • Students €170/€200