BacTech Updates Zero-Tailings™ Patent Application to Include Fertilizer Concentration Process

BacTech Updates Zero-Tailings™ Patent Application to Include

Fertilizer Concentration Process

Addition of Reverse Osmosis and Mechanical Vapour Recompression Technology Supports

Production of Specification-Grade Ammonium Sulphate

TORONTO, ONTARIO — May 25, 2026 — BacTech Environmental Corporation

(CSE: BAC | OTCQB: BCCEF)

BacTech Environmental Corporation (“BacTech” or the “Company”) announces that it

has updated its provisional Zero-Tailings™ patent application to include a two-stage

concentration process designed to improve the production efficiency of ammonium

sulphate generated from acidic mining-related process streams.

The revised patent application incorporates Reverse Osmosis (“RO”) pre-concentration

and Mechanical Vapour Recompression (“MVR”) evaporation technologies into the

Zero-Tailings™ process flowsheet. These technologies are intended to reduce energy

consumption associated with ammonium sulphate crystallization and support the

production of specification-grade fertilizer products.

The Company believes the addition strengthens the scope of the provisional patent

application by extending coverage from acidic feed streams through to ammonium

sulphate recovery and crystallization.

Process Enhancement

Many hydrometallurgical and mining operations generate acidic, iron-bearing streams

that require neutralization and disposal treatment. BacTech’s Zero-Tailings™ process is

being developed to recover potentially valuable by-products from these streams,

including ammonium sulphate, magnetite, and certain base metals.

The Company identified ammonium sulphate concentration and crystallization as an

area requiring additional optimization for certain mining-derived streams due to their

relatively dilute nature. The addition of RO and MVR technologies is intended to

improve process efficiency and reduce energy requirements associated with fertilizer

production.

RO and MVR are commercially established technologies currently used in a range of

industrial water treatment and evaporation applications. The Company believes the

revised provisional patent application broadens the technical scope of the Zero-

Tailings™ process and supports ongoing evaluation of potential commercial

applications.

The process is intended to reduce waste treatment requirements while generating

potentially recoverable products from streams that are typically treated as waste.

Where appropriate, the RO reject stream can be recycled into the evaporation circuit,

further minimising water consumption and maximising ammonium sulphate recovery.

Condensate from the evaporation stage is also recycled, making the overall process

highly water-efficient — a meaningful advantage in water-stressed mining jurisdictions.

Patent Application and Development Activities

The revised provisional patent application protects the complete, commercially Zero-

Tailings™ flowsheet from acidic waste stream through to a saleable, specification-grade

ammonium sulphate fertilizer product. Management believes the revised provisional

patent application may:

• expand the technical scope of the Zero-Tailings™ process;

• support evaluation of the process across a broader range of feed streams; and

• preserve the Company’s priority date while patent work continues.

This technology development would not be possible without the research funds secured

through MIRARCO from Natural Resources Canada, Critical Minerals Research

Development and Demonstration, the Strategic Innovation Fund through the Mining

Innovation Commercialization Program, Ontario Centre of Innovation, Critical Minerals

Innovation Fund (Ontario Ministry of Energy and Mines), the Northern Ontario Heritage

Fund Industrial Research Chair Program, institutional support through Laurentian

University and Cambrian College, and industrial support from Vale Base Metals.

BacTech Environmental Corporation is a leader in commercial bioleaching, utilizing

naturally occurring bacteria to recover valuable metals while stabilizing harmful elements

such as arsenic. The Company is advancing a fully permitted 50-tonne-per-day bioleach

facility in Tenguel –Ponce Enríquez, Ecuador, and is developing its proprietary Zero-

Tailings critical minerals recovery technology in Sudbury, Canada with Mirarco.

Ross Orr, President and CEO of BacTech, is responsible for the contents of this press

release.

([email protected] + 416-346-5529)

About BacTech Environmental Corporation

BacTech Environmental Corporation (CSE: BAC | OTCQB: BCCEF) is a Canadian clean-

technology company specialising in the commercialisation of bioleaching and advanced

mineral processing technologies that convert environmentally harmful waste streams into

revenue-generating products. The Company's flagship Tenguel bioleaching project in

Ecuador is fully permitted and construction-ready, targeting approximately 30,000 ounces

of gold production per year from arsenopyrite concentrates supplied by local artisanal

miners. BacTech's Zero-Tailings™ platform extends the Company's technology offering

to the global hydrometallurgical industry, with applications across gold, copper, nickel,

rare earths, and acid mine drainage remediation.

Investor Relations Contact

BacTech Environmental Corporation | www.bactechgreen.com

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Cautionary Note Regarding Forward-Looking Statements

This press release contains forward-looking statements and forward-looking information

within the meaning of applicable Canadian securities legislation. Forward-looking

statements involve known and unknown risks, uncertainties, and other factors that may

cause actual results to differ materially from those expressed or implied by such

statements. Readers are cautioned not to place undue reliance on forward-looking

statements. BacTech does not undertake any obligation to update or revise any

forward-looking statements, except as required by applicable