Microbial bioremediation (enzymatic degradation, PFAS destruction, MBR wastewater)

Microbial bioremediation uses bacteria, fungi, microalgae and engineered enzymes to degrade, detoxify or immobilize pollutants — waste plastics, per- and polyfluoroalkyl substances (PFAS), hydrocarbons, industrial effluents and municipal wastewater — converting contaminants into harmless metabolites, recoverable monomers or inert residue. It is the lowest-energy, lowest- carbon route to environmental cleanup, and it is scaling fast on regulatory pressure: the US EPA’s 2024 national primary drinking water regulation caps PFOA and PFOS near 4 parts per trillion, and the EU’s revised Urban Wastewater Treatment Directive pushes energy neutrality and nutrient removal. Carbios operates enzymatic polyethylene-terephthalate biorecycling at a 50,000-tonne-per-year reference scale (Longlavat, France, with a second 50,000-tonne plant in Haining, China expected in H1 2028); Revive Environmental’s PFAS Annihilator uses supercritical water oxidation to destroy forever chemicals at facility scale; and Beijing Originwater’s membrane bioreactors underpin large Chinese municipal plants while VA Tech Wabag runs a 45-megalitre-per-day tertiary treatment plant in Chennai under a contract above 1,000 crore rupees. The global water and wastewater treatment services market, into which most of this flows, exceeds 300 billion dollars a year.

The key directions of microbial bioremediation are:

1. Enzymatic plastic biodegradation (Carbios): engineered PET hydrolase enzymes depolymerize waste polyethylene terephthalate into its monomers for repolymerization into virgin-grade resin, at a 50,000-tonne-per-year commercial scale in France.
2. PFAS and persistent-pollutant destruction (Revive, Allonnia): Revive’s supercritical water oxidation shatters PFAS molecules at facility scale, while Allonnia’s engineered microbes target biosorption and degradation of mining and waste contaminants.
3. Membrane bioreactors and bio-wastewater (Originwater, Wabag): the membrane bioreactor fuses activated-sludge biology with membrane separation, delivering high-quality reuse water from municipal and industrial effluent at plants like Chennai’s 45-MLD tertiary facility.
4. Industrial enzyme biosolutions (Novonesis): engineered enzymes degrade fats, starches, proteins and recalcitrant organics in wastewater and sludge, lifting biogas yield and cutting chemical oxygen demand before discharge.

Sectoral value chain#

[Pollutant stream: wastewater / effluent / waste plastic / contaminated site] ──> [Characterization & conditioning] ──> [Bio-treatment: microbial / enzymatic / MBR / destruction]
                                                                                                                          │
                                                                                                              (separation and recovery)
                                                                                                                          │
                                                                                                                          ▼
[Outputs: clean water · recovered monomers · inert residue] <─── [Polishing and discharge or reuse]

Value chain levels#

Cross-cutting technologies of the sector:

• Engineered enzymes and strains: Novonesis and Carbios tune enzyme active sites to cleave specific bonds (ester, peptide, fluorocarbon) that natural biodegradation cannot reach.
• Membrane and separation tech: polymeric and ceramic membranes drive the membrane bioreactor and tertiary reverse-osmosis stages that make direct water reuse economical.
• Biosensors and monitoring: real-time chemical oxygen demand, PFAS and pathogen sensors close the control loop that keeps bio-treatment within permit limits.

The microbial-bioremediation stack rests on four pillars: enzymatic depolymerization, PFAS destruction, membrane bioreactors and industrial biosolution enzymes — together converting contaminants into clean water, recoverable monomers and inert residue.

1. Enzymatic depolymerization:
   • Carbios’ engineered LCC (leaf-branch-compost) polyethylene-terephthalate hydrolase cleaves the ester bonds in waste PET at a 50,000-tonne-per-year scale, yielding purified terephthalic acid and ethylene glycol for repolymerization.
   • Directed evolution raised enzyme thermostability and turnover to industrial rates, enabling a stirred-tank process that tolerates mixed and coloured waste.
2. PFAS destruction and biosorption:
   • Revive’s supercritical water oxidation operates above water’s critical point (~374 C and 220 bar) to mineralize PFAS to carbon dioxide, fluoride and water below detection limits.
   • Allonnia’s engineered microbes pursue selective biosorption and degradation of mining and waste contaminants, an emerging complement where destruction is impractical.
3. Membrane bioreactors:
   • The MBR fuses activated-sludge biology with submerged ultrafiltration or microfiltration membranes, sustaining high biomass concentration and removing the secondary clarifier; Originwater deploys it at municipal scale across China.
   • Membrane flux, fouling control and aeration energy set operating cost, the levers Wabag tunes in plants like the 45-MLD Chennai tertiary reverse-osmosis facility.
4. Industrial biosolution enzymes:
   • Novonesis enzymes hydrolyze lipids, starches and proteins in wastewater and sludge, reducing chemical oxygen demand and lifting biogas yield in anaerobic digestion.
   • Formulation stability across pH, temperature and inhibitor gradients decides whether a biosolution survives a real municipal or industrial plant.