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BACKGROUNDSustainable wastewater management mostly implicates treatment cost, viability, and performance of an appropriate system, in addition to reuse and recycling, to meet the present social needs. In the current study, algal technology was coupled with paddy‐soaked rice mill wastewater (PSRMW) treatment to enhance the efficient treatment and economic feasibility of algal‐based eco‐friendly products. Initially, the selected microalgae, Chlorella pyrenoidosa, were cultured in raceway ponds using PSRMW as a growth medium. Then, the harvested live algal biomass was carried forward to subsequent study, after primary seedling experiments of Indian okra (Abelmoschus angulosus), which involves soil amendment treatment samples T1 (control soil – no amendment), T2 (soil + live algal biomass), and T3 (soil + chemical fertilizer).RESULTSThe maximum ammoniacal nitrogen (NH3‐N) and phosphate (PO4‐P) removal of ~70% (average yield coefficient (YN): 5.78 mg biomass mg−1 of N) and ~65% (YP: 14.13) were obtained from the phycoremediation experiments. The biochemical composition such as lipid, protein, and carbohydrate contents of harvested biomass were recorded as ~35%, ~30%, and ~9%, respectively. From the biofertilizer experiments, the maximum absolute growth rate (AGR) of 0.40 day−1 was obtained in T2 plants with better growth characteristics of chlorophyll, fresh and dry shoot, root weights (which were ~30% more than that of T3), and control soil (T1) does not exhibit the plant growth as the soil was low in nutrients.CONCLUSIONThe present study revealed the phycoremediation potential of C. pyrenoidosa in PSRMW treatment and the application of produced algal biomass as a soil amendment for the growth of A. angulosus. © 2020 Society of Chemical Industry (SCI)

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Paddy processing (Rice mill) industries are agro‐based industries which discharge wastewater with high organic content, cause nutrient overloading to the environment. Amaranthus palmeri and Sorghum vulgare were used to reduce the excess nutrients from the soil collected from land near a rice mill where wastewater is being disposed. Potted plant experiments were conducted for the selected species and tested for its growth potential and compared with control soil (normal soil). Absolute growth rate (AGR) of 0.52and 1.61 cm/day were obtained for A. palmeri and S. vulgare grown in contaminated soil (APCS and SVCS) which are 2.89 and 1.23 times more than that of the species grown in control soil (APC and SVC), respectively. A positive correlation was observed between AGR and their dry weights (r > 0.685; P = 0.01), and nitrogen removal (r > 0.464; P = 0.01) where it was the negative correlation in phosphate removal (AGR: r < 0.481; P = 0.01; dry weight: r < 0.245; P = 0.05). Significant ANOVA results were obtained for the interaction effect among the species and soil on the nutrient removal efficiency (RE) with respect to AGR and dry weight. It is evident that the both A. palmeri (RE: N = 98.81% and K = 72.32%) and S. vulgare (RE: N = 99.54% and K = 73.23%) are the promising species to remediate the nutrient overloaded soil. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 354–361, 2019