The excess nutrients in the wastewater, like ammonia, nitrite, nitrate, and phosphates, are leading water bodies to eutrophication. The traditional biological treatment methods for removing nitrogen and phosphorus from wastewater are expensive, mainly because there's not enough natural material to help break them down. Microalgae hold immense potential as an environmentally sustainable resource in treatment plants for wastewater treatment. This study aims to understand how nitrogen and phosphorus pollution can be reduced in household wastewater using special types of algae called Chlorella vulgaris and Scenedesmus quadricauda in a controlled three batch bioreactor to see how they affect the organic carbon content. It has been observed that Scenedesmus quadricauda is more effective in removing ammonia nitrogen (NH₃-N) (83.5%), orthophosphate (PO₄ ⁻³) (57.9%), and total carbon (TC) (86.7%) from household wastewater compared to Chlorella vulgaris. On the other hand, Chlorella vulgaris shows double the efficiency in removing total nitrogen (TN) (%76.5) compared to Scenedesmus quadricauda. While both types of algae are good at removing inorganic carbon and ammonia nitrogen, they show relatively lower efficiency in removing nitrate nitrogen (NO₃ ⁻-N) (%39) and orthophosphate. The kinetic modeling of Chlorella vulgaris and Scenedesmus quadricauda microalgaes are determined for optimize water treatment process. For substrate of NH₃-N due to their consumption priority, µ_max is 1.85 day⁻¹, K_s is 33.3 mg/L. Besides, for Chlorella vulgaris, using the substrate of NH₃-N, µ_max is 1.05 day⁻¹, K_s is 11.2 mg/L.

Microplastics (MPs) have indeed raised significant concerns due to their widespread presence and potential adverse effects on both the environment and human health. This study aims to illuminate crucial aspects of MPs, including their origins, migration behavior, and the potential for bioremediation as an effective strategy for their removal. Microplastics can originate from various sources, such as the fragmentation of larger plastics, the presence of microbeads in personal care products, the shedding of fibers from textiles, industrial pellets, and products containing microplastics. These diverse sources contribute to the omnipresence of microplastics in both terrestrial and aquatic ecosystems. This study focuses on observing the biological degradation process of two fungi, Aspergillus flavus, and Aspergillus versicolor when exposed to three different types of microplastics: Polypropylene (PP), Polyethylene (PE), and Polystyrene (PS). After conducting experiments, removal efficiencies of A. flavus and A. versicolor were calculated. Based on the data collected during the 10th week of using these fungi, it was observed that A. flavus exhibited removal efficiencies of 18.3% for PE, 6.8% for PP, and 1.9% for PS. On the other hand, A. versicolor yielded removal efficiencies of 6.7% for PE, 5.1% for PP, and 3.3% for PS. It was determined that A. flavus and A. versicolor exhibited the highest biodegradation efficiency when targeting microplastic PE, while their effectiveness was relatively lower when dealing with microplastic PS.