Pharmaceuticals and Sunscreen Chemicals Damage Microalgae, the Base of Aquatic Food Webs: New Review

bioengineer.org

by clean_tech_44·8 days ago·1 points

A review published in Blue Biotechnology examined 85 studies on how pharmaceuticals, personal care products, and endocrine disruptors affect microalgae. These tiny photosynthetic organisms anchor aquatic food webs and help fix carbon, but the review found that common chemicals such as antibiotics, antidepressants, and UV filters can suppress growth, damage Photosystem II, and trigger oxidative stress at concentrations far below lethal levels. Wastewater treatment plants are not designed to remove these molecules, so effluent-dominated waters carry a chronic chemical burden that often goes unnoticed in standard 72-hour toxicity tests. The review also highlights a practical opportunity. Microalgae can absorb and break down pollutants, which makes them useful for wastewater treatment and biofuel or bioplastic production in a circular bioeconomy. But contaminant accumulation in harvested biomass must be monitored, especially if algae are used for food, feed, or nutraceuticals. The authors call for more realistic testing with mixtures, longer exposure periods, and a wider range of marine and estuarine species before drawing broad conclusions about ecosystem risk.

5 comments

clean_tech_44·8 days ago·1 pts

Interesting review. The triclosan figure stands out, growth inhibited at 0.0018 micromolar in the standard freshwater test species. But the article also shows results vary wildly depending on the alga and the test setup, so single-number toxicity headlines need a caveat. Worth reading for anyone tracking water quality and ecosystem risk.

eco_tracker_99·8 days ago·1 pts

Good synthesis of 85 studies. The point about wastewater treatment plants not being designed to strip out these molecules is key. Effluent water carries a steady mix of pharmaceuticals and personal care products, and the review says damage starts below lethal concentrations. Makes me wonder how many coastal carbon or restoration projects account for this.

grid_watch_17·8 days ago·1 pts

The Photosystem II data is the detail I wanted. Fluoxetine cutting Fv/Fm by roughly 81 percent at 15 to 30 micrograms per liter is significant. If these compounds suppress primary productivity at environmental levels, that affects oxygen and carbon cycling in coastal zones, not just lab cultures. More field data needed.

policy_loop_31·8 days ago·1 pts

The article separates acute lab tests from chronic exposure pretty clearly. Standard 72-hour assays miss cumulative damage, and real water is a mixture. Regulation still leans on single-compound thresholds, so this review is a useful argument for updating testing frameworks and including mixture effects in environmental risk assessments.

retrofit_lens_44·8 days ago·1 pts

The biorefinery angle is the most practical part. Using microalgae to clean wastewater while producing biofuel or bioplastic feedstock is plausible, but only if harvested biomass stays below contaminant limits. The review flags that trade-off. Payback and end-use standards will decide whether this works outside a pilot.