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Usman, Muhammad; Khan, Aqib Zafar; Malik, Sana; Xiong, Wenlong; Lv, Yongkun; Zhang, Shen; Zhao, Anqi; Solovchenko, A.E.; Alam, Md Asraful; Alessa, Abdulrahman H.; Mehmood, Muhammad Aamer; Xu, Jingliang
Chemosphere (Oxford), August 2024, 2024-08-00, 20240801, Volume: 361Journal Article
Peri-urban environments are significant reservoirs of wastewater, and releasing this untreated wastewater from these resources poses severe environmental and ecological threats. Wastewater mitigation through sustainable approaches is an emerging area of interest. Algae offers a promising strategy for carbon-neutral valorization and recycling of urban wastewater. Aiming to provide a proof-of-concept for complete valorization and recycling of urban wastewater in a peri-urban environment in a closed loop system, a newly isolated biocrust-forming cyanobacterium Desertifilum tharense BERC-3 was evaluated. Here, the highest growth and lipids productivity were achieved in urban wastewater compared to BG11 and synthetic wastewater. D. tharense BERC-3 showed 60–95% resource recovery efficiency and decreased total dissolved solids, chemical oxygen demand, biological oxygen demand, nitrate nitrogen, ammonia nitrogen and total phosphorus contents of the water by 60.37%, 81.11%, 82.75%, 87.91%, 85.13%, 85.41%, 95.87%, respectively, making it fit for agriculture as per WHO's safety limits. Soil supplementation with 2% wastewater-cultivated algae as a soil amender, along with its irrigation with post-treated wastewater, improved the nitrogen content and microbial activity of the soil by 0.3–2.0-fold and 0.5-fold, respectively. Besides, the availability of phosphorus was also improved by 1.66-fold. The complete bioprocessing pipeline offered a complete biomass utilization. This study demonstrated the first proof-of-concept of integrating resource recovery and resource recycling using cyanobacteria to develop a peri-urban algae farming system. This can lead to establishing wastewater-driven algae cultivation systems as novel enterprises for rural migrants moving to urban areas. Display omitted •Wastewater-grown algal biomass has been questioned for biotech use.•Resource recovery from urban wastewater and use of algal biomass as soil amender.•Soil incubation with wastewater-grown biomass and recycling of treated water.•Desertifilum tharense BERC-3 improved soil fertility and soil microbial activities.•Resource recovery and recycling in peri-urban environments for biomass production.
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