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

01Overview and value chain

Markers: [EC: US EPA PFAS MCL + EU Urban Wastewater Treatment Directive | OECD: Environmental biotechnology, Circular bioeconomy | Regulator: EPA (USA), ADEME (France), REACH (EU)]

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.

02US

The United States pairs environmental-biotech start-ups with the world’s tightest PFAS regime: the EPA’s 2024 drinking-water maximum contaminant levels (~4 parts per trillion for PFOA and PFOS) plus Superfund designation for PFOA/PFOS create a bankable destruction market.

PFAS destruction, engineered microbes, enzymatic platforms

• Revive Environmental: its PFAS Annihilator, developed with Battelle, uses supercritical water oxidation (heat, pressure and oxidant) to break the carbon-fluorine bond and destroy PFAS to non-detect levels at facility scale, deployable at waste and water sites.
• Allonnia: a Ginkgo Bioworks spinout building engineered-microbe biosolutions; its D-Solve uses microbe-generated agents to selectively dissolve gangue minerals in mining flowsheets, extending biosolutions from wastewater into process remediation.
• PFAS and CERCLA pull: the EPA MCL plus the designation of PFOA and PFOS as CERCLA hazardous substances turns PFAS liability into a funded destruction pipeline for Revive-class technologies.

03CN

China runs the world’s largest municipal wastewater build-out, anchored by membrane-bioreactor leaders like Beijing Originwater and by enzymatic-recycling capacity coming online with Carbios’ Asian plant.

MBR municipal treatment, enzymatic recycling capacity

• Beijing Originwater (300070): a leading Chinese water company whose membrane bioreactor combines activated-sludge biology with submerged membrane modules, replacing the secondary clarifier and sustaining high mixed-liquor suspended solids for high-quality reuse water.
• Carbios Haining plant: the 50,000-tonne-per-year enzymatic PET biorecycling facility in Zhejiang, built with Wankai New Materials, is now expected to start up in H1 2028 after site-specific technical adaptations.
• Scale and policy: China’s treated-wastewater volume and reuse targets make membrane and biological treatment the dominant remediation route, supported by national pollution-discharge standards (GB 18918).

04EU

Europe pairs enzymatic-bioremediation leadership (Carbios, Novonesis) with a regulatory frame — the revised Urban Wastewater Treatment Directive and the planned EU PFAS restriction — that forces energy-neutral plants and pollutant elimination.

Enzymatic recycling, biosolution enzymes, water directive

• Carbios (Euronext: ALCBR): its Longlavat (France) 50,000-tonne-per-year plant enzymatically depolymerizes waste PET into purified monomers for food-grade repolymerization, the reference commercial site for enzymatic plastic biorecycling.
• Novonesis: the Novozymes–Chr. Hansen merger (effective 2024) created the leading industrial biosolutions firm, supplying engineered enzymes that cut chemical oxygen demand and lift biogas yield across municipal and industrial wastewater.
• Directive pull: the revised Urban Wastewater Treatment Directive mandates energy neutrality for large plants and tertiary treatment in sensitive areas, while the REACH-based PFAS restriction proposal adds destruction demand for Revive-class technology.

05Leading companies and research institutes

06Tech stack and innovations

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.

07Value chains and production pipelines

Industrial pipeline of membrane-bioreactor wastewater treatment (GB 18918 / EU UWWTD)

┌───────────────────────────┐      ┌───────────────────────────┐
│ 1. Influent screening      │ ───> │ 2. Primary treatment      │
└───────────────────────────┘      └───────────────────────────┘
                                                  │
                                                  ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 4. Membrane separation    │ <─── │ 3. Activated-sludge biotreatment│
└───────────────────────────┘      └───────────────────────────┘
              │
              ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 5. Tertiary polishing     │ ───> │ 6. Discharge or reuse      │
└───────────────────────────┘      └───────────────────────────┘

Stage 1: Influent screening

Raw municipal or industrial sewage passes through coarse and fine screens and grit removal to protect downstream pumps and membranes from rags, grit and debris before equalization.

Stage 2: Primary treatment

Primary settling removes settleable suspended solids and floating scum, cutting the biological load by roughly a third and producing primary sludge routed to anaerobic digestion.

Stage 3: Activated-sludge biotreatment

Aerobic microbes in the bioreactor oxidize dissolved organic matter, with nitrification and denitrification stages removing nitrogen; high mixed-liquor suspended solids raise the treatment rate in the MBR configuration.

Stage 4: Membrane separation

Submerged ultrafiltration or microfiltration membranes separate the cleaned water from the biomass, replacing the secondary clarifier and yielding a solids-free permeate at the heart of Originwater’s MBR plants.

Stage 5: Tertiary polishing

The permeate passes through tertiary treatment — activated carbon, disinfection or reverse osmosis — as in Wabag’s 45-MLD Chennai tertiary-treatment reverse-osmosis plant, to reach reuse or stringent discharge limits.

Stage 6: Discharge or reuse

Polished effluent is discharged to a receiving water body under GB 18918 or the EU Urban Wastewater Treatment Directive, or reused for industrial, urban or agricultural purposes, closing the water loop and valorizing the treated stream.