Mark J O'Hara

Title: The Innovative Contributions of Mark J O'Hara in Environmental Engineering

Introduction: Mark J O'Hara, a distinguished inventor based in Mt. Prospect, IL, has made significant contributions to the field of environmental engineering. With a remarkable portfolio of 26 patents, O'Hara’s innovations focus primarily on the immobilization of toxic metals from solid waste, contributing to safer waste management practices.

Latest Patents: Two of O'Hara's most notable recent patents address critical environmental issues. The first patent pertains to the "Immobilization of lead and cadmium in solid residues from the combustion." This innovation demonstrates how solid residues from burning solid waste can pass the EPA toxicity test by ensuring the pH remains within the range of 7.5 to 12.0. By incorporating water-soluble phosphate, particularly phosphoric acid, the immobilization of these hazardous metals is improved, allowing compliance with toxicity tests across a wider pH range.

The second patent, "Immobilization of lead and cadmium in fly ash," reveals that the leaching of cadmium and lead from incinerated refuse can be effectively mitigated by adding calcium sulfide to the residues. A practical approach involves combining dry lime and an aqueous solution of an inorganic salt that supplies sulfide, especially an alkali metal sulfide, in equimolar quantities, leading to environmentally acceptable levels of these toxic metals.

Career Highlights: Over the years, Mark J O'Hara has worked with notable companies such as UOP LLC and Wheelabrator Environmental Systems, Inc. His valuable experience in these organizations has contributed to his ability to develop innovative solutions for environmental challenges.

Collaborations: Throughout his career, O'Hara has collaborated with esteemed professionals in his field, including Russell W Johnson and Lee Hilfman. These partnerships have fostered a conducive environment for creativity and innovation, allowing for the advancement of valuable environmental technologies.

Conclusion: Mark J O'Hara's contributions to environmental engineering through his patents exemplify his commitment to addressing significant challenges in waste management. His innovative approaches provide practical solutions for immobilizing hazardous metals, ensuring safer environments and compliance with regulatory standards. O'Hara's work continues to inspire future advancements in the field.