Bioengineering Pseudomonas putida to degrade halocarbon-based refrigerants.

The Halocarbon Dilemma

THE COLD RUSH IS HEATING UP THE PLANET...

NUMBER OF COOLING APPLIANCES IN-USE GLOBALLY

A warming planet, rapid urbanization and growing population have driven up the global demand for refrigeration and air conditioning. The numbers are projected to touch 10 billion appliances by 2050. Domestic use of air-conditioners will grow as much as five-times by 2050.

Halocarbons – The ubiquitous coolants

Chlorofluorocarbons (CFCs) had been synonymous with coolants for most of the last century despite the harm they have caused to the planet’s atmosphere. After the Montreal Protocol identified them as the leading cause of ozone depletion in 1989, these gases were replaced by yet another group of halocarbons – HCFCs and HFCs. Currently, these gases serve a massive 83% of the world’s cooling needs. 

REFRIGERANT TYPES VAPOR COMPRESSION SYSTEMS

A smouldering future

Hydrochlorofluorocarbons (HCFCs) and Hydrofluorocarbons (HFCs), although less potent than CFCs, have high global warming potentials and continue to affect the ozone layer. With the rising emissions of halocarbons and other green-house gases, studies predict that the earth will warm up 2 - 2.5 °C above the pre-industrial levels by 2100.

OZONE DEPLETION POTENTIALS (ODPS) and GLOBAL WARMING POTENTIALS (GWPS)

Efforts to abate

Initiatives are being taken and agreements are being signed globally to mitigate the impending climate catastrophe. Party to the Kigali Agreement and HCFC Phase Out Management Plans (HPMPs), more than 130 countries have put the halocarbons in a process of phase-out, to be replaced by greener coolants. These regulations alone can help avoid as much as 0.5 °C rise in global temperature this century. 

HFC EMISSIONS

But what about the coolants that already exist?

The phase-out activities will ensure that newer, greener technology replaces the halocarbon-based coolants. However, the existing reserves or ‘banks’ of these potentially polluting coolants still need to be taken care of. Once rendered obsolete, the HCFCs and HFCs will either leak into the atmosphere from dump yards, where our appliances go, or from banks – tons and tons of gases we don’t have any use for.  

The emissions of HCFC-22 alone are equivalent to carbon sequestered by 82,675,429,895 tree seedlings grown for 10 years

Our Solution

Borne out of multiple months of brainstorming and integrated efforts, Halocleen aims to build a sustainable and green solution to the halocarbon disposal problem. We are incorporating enzyme systems that can degrade most of these gases through a sequential anaerobic-aerobic pathway into the bio-industrial workhorse, Pseudomonas putida. To deliver our remedy to the world, we are designing a cost-efficient bioreactor. With Halocleen, we want to contribute towards preserving the environment for generations to come!

Read on to know more about our idea and our efforts to bring it to fruition.