Sustainable treatment of shrimp aquaculture wastewater using ATS-HRAP system with Chlorella vulgaris: A Nature-Based Approach for Environmental Protection

Tóm tắt

This study evaluates the effect of ATS substrate mesh size (0.2 mm, 0.6 mm, and 1 mm) and biomass retention time (7, 14, and 20 days) on nutrient removal efficiency and biomass development in an integrated High Rate Algal Pond (HRAP) system using Chlorella vulgaris for shrimp aquaculture wastewater treatment. A synthetic saline wastewater (7 ppt) simulating shrimp effluent was treated under controlled conditions. The results show that phosphate was removed most effectively, with average removal efficiencies reaching 86% under the 0.6 mm mesh and 7-day BRT. Total nitrogen removal peaked at 71.4% under the same condition. COD removal was modest, with a maximum of 22.1%, observed with the 1 mm mesh and 7-day BRT. Biomass accumulation was influenced by both substrate mesh size and retention time, with the highest MLVSS to MLSS ratios (above 0.75) found under mid-range mesh configurations. The findings highlight the role of substrate design and harvesting strategy in optimizing microalgae-based wastewater treatment systems and support the use of C. vulgaris as a feasible option for nutrient recovery and biomass production in saline aquaculture settings.