PFAS remediation
Air sparging, soil washing, phytoremediation, pump-and-treat, and treatment-train thinking for PFAS-impacted soil and groundwater.
PFAS remediation services
Aquentis Enviro — PFAS remediation and industrial wastewater consultancy
Specialist PFAS remediation, contaminated-site strategy, LC-MS/MS data interpretation, and industrial wastewater engineering for evidence-led environmental decisions.
About the practice
Rigorous science, translated into practical environmental decisions.
Aquentis Enviro is a specialist environmental consultancy translating rigorous PFAS remediation science, contaminated-site assessment, analytical interpretation, and industrial wastewater management into practical decisions.
The practice helps organisations turn complex contamination challenges into evidence-based next steps: from bench-scale tests and numerical modelling to field implementation, partner coordination, and regulatory reporting.
The work is built for scrutiny: clear assumptions, transparent data interpretation, and recommendations that a technical team, regulator, or project board can act on.
What Aquentis does
Focused expertise for high-stakes environmental work.
Support for industry, consultancies, regulators, and research consortia where PFAS, groundwater, and industrial effluent decisions need specialist depth.
Numerical modelling and computational tools
Custom Python and MATLAB tools for complex PFAS and wastewater datasets, mass-balance analysis, sensitivity testing, visualisation, and reproducible decision support.
Analytical interpretation
PFAS quantification, suspect screening, and data interpretation across soil, water, foam, treatment streams, and co-contaminants.
View lab evidenceSite investigation and risk assessment
Conceptual site models, groundwater and soil sampling design, exposure pathways, and risk-based decision support for impacted sites.
Contaminated land servicesIndustrial wastewater management
Consultancy for complex organic loads, resource recovery, sustainable operation, AnMBR performance, fouling indicators, and process evaluation.
Industrial wastewater servicesReporting and project leadership
Regulator-facing reports, technical review, proposal writing, Horizon Europe coordination, and work package leadership across partners.
Discuss supportHow Aquentis works
A clear path from contamination problem to defensible decision.
Most engagements follow three stages, scaled to the size of the question and the evidence already available.
1
Assess
Review site data, conceptual model, and regulatory drivers; define the contamination problem, receptors, and what success looks like.
2
Model & test
Bench-scale experiments, LC-MS/MS interpretation, and numerical modelling of PFAS fate, transport, and treatment performance to compare options.
3
Recommend
Translate the evidence into a practical, costed remediation strategy and clear technical reporting for partners, regulators, and stakeholders.
Remediation toolkit
Choose the right method for the site, not the other way around.
PFAS treatment depends on source strength, hydrogeology, receptors, regulatory drivers, and operational constraints. Aquentis compares those factors before recommending a path.
Track record
Decision support across site, lab, model, and regulator-facing work.
Aquentis Enviro is built around practical outputs: clearer conceptual models, stronger technology choices, defensible monitoring plans, and transparent evidence for project teams and decision-makers.
GlobalProjects and collaboration across Europe, Australia, Sri Lanka, the US, and India.
Field-to-dataSampling context, LC-MS/MS interpretation, PFAS modelling, and wastewater diagnostics in one advisory workflow.
Decision-readyFeasibility reviews, monitoring logic, risk assessment, and regulator-facing technical reporting.
Mar 2023 - presentUppsala, Sweden
Senior Researcher & Project Investigator
Leads applied PFAS remediation research within European Commission and nationally funded environmental projects — spanning air sparging, soil washing, phytoremediation, and numerical modelling of contaminant fate and transport.
Aug 2023 - Feb 2024Melbourne, Australia
Engineering Intern - Groundwater Contamination and Remediation
Environment Protection Authority (EPA) Victoria. Reviewed remediation projects and environmental audit reports, and built a remediation technology database to support agency guidance.
2019 - 2024Melbourne, Australia
Doctoral Researcher - Chemical Engineering
Victoria University, Institute of Sustainable Industries and Liveable Cities. Investigated submerged anaerobic membrane bioreactor systems, dynamic fouling models, and biomethane recovery for high-strength industrial effluents.
Aug 2016 - Jul 2019Lucknow, India
Lecturer - Water and wastewater treatment process design
BBA University. Delivered water and wastewater treatment process design teaching, advanced hydraulic structures, and applied environmental engineering project supervision.
From field to lab
Real sites, real samples, real treatment questions.
Use the field and laboratory evidence to connect technology choices with site-specific constraints.
Media shown here are proprietary Aquentis Enviro field, laboratory, and project visuals © 2026. All rights reserved.
Consulting and collaboration
How Aquentis can help your organisation.
Specialist PFAS and industrial wastewater support for the people who have to make defensible environmental decisions.
Industry and site operators
Remediation feasibility, technology selection, monitoring design, and performance evaluation for PFAS-impacted sites.
PFAS, contaminated-land, and engineering consultancies
Specialist input on PFAS fate and transport, contaminated-site strategy, numerical modelling, LC-MS/MS interpretation, and remediation reporting.
Regulators and agencies
Evidence review, guidance development, and technical briefings, with experience across EPA Victoria and Swedish frameworks.
EU Horizon and research consortia
Proposal support, work package leadership, scientific coordination, and technical delivery across multinational environmental research partnerships.
Collaboration experience
Built for multi-partner environmental projects.
Through academic and project roles, Rajneesh has worked alongside partners across Europe, Australia, Sri Lanka, the US, India, and beyond, spanning research consortia, geotechnical and environmental agencies, regulators, and industry. Aquentis Enviro brings that multi-country, multi-partner experience to every engagement.
Featured research · case study
Air sparging + foam fractionation for AFFF-impacted soil.
A controlled column study on field-contaminated soil from a Swedish airport firefighting-foam (AFFF) site, testing how much PFAS air sparging can move out of saturated soil — and capture in foam.
Paired soil columns were run side by side — one with water flow only, the other with water plus injected air — so the added effect of sparging could be isolated. Air sparging sharply increased the share of PFAS transferred from soil into the mobile water and foam phases, especially for the surface-active sulfonates and fluorotelomers that are hardest to treat. The rising foam acted as a dedicated capture pathway, while short-chain PFCAs moved mainly with the water.
3.5% → 21%PFHpS exported (water-only → with air)
up to 38%of PFOA captured in foam
~30×rise in aqueous PFOS under sparging
The practical takeaway: for saturated PFAS source zones, pairing air injection with controlled foam recovery offers a targeted way to mobilise and capture the most surface-active PFAS — provided field design controls where the mobilised mass goes.
Selected publications
Research credibility behind the consulting.
Selected peer-reviewed work in PFAS remediation, environmental risk, analytical screening, and anaerobic membrane bioreactor systems.
Chemical Engineering Journal - 2026
Evaluating the influence of air sparging technique on PFAS desorption and mobilization in soil using short-term column experiments
Gautam, R. K., Kleja, D. B., Enell, A., Montelius, M., Pettersson, M., Mottaghipisheh, J., and Ahrens, L.
J. Hazardous Materials Advances - 2025
PFAS contamination in key Indian states: environmental impacts, regulatory challenges, and predictive exposure
Gautam, R. K., Mottaghipisheh, J., Verma, S., Singh, R. P., Muthukumaran, S., Navaratna, D., and Ahrens, L.
Chemical Engineering Journal - 2024
Sustainable operation of a submerged anaerobic membrane bioreactor (SAnMBR) with ceramic ultrafiltration
Gautam, R. K., Olubukola, A., Verma, S., Muthukumaran, S., and Navaratna, D.
Let’s work together
Bring specialist science into your next environmental decision.
For PFAS remediation, contaminated-site review, industrial wastewater management, or research collaboration, Aquentis Enviro would be glad to hear from you.
