Ahsan Md Ariful, Rahman M Safiur, Bhuiyan Md Abdul Quaiyum, Rahaman Md Saifur, Rahman Mir Tamzid, Khan Mubarak Ahmad
Isotope Hydrology Division, Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Bangladesh Atomic Energy Commission, Savar, Dhaka, Bangladesh.
Chemistry Division, Atomic Energy Centre, Bangladesh Atomic Energy Commission, Savar, Dhaka, Bangladesh.
Heliyon. 2022 Jul 20;8(8):e10009. doi: 10.1016/j.heliyon.2022.e10009. eCollection 2022 Aug.
This investigation concentrates on the possibility of using gamma radiation for the decomposition of organic pollutants in textile wastewater and reuse as irrigation water. The wastewater sample was irradiated at four different absorbed doses of 3, 5, 8, and 10 kilo Gray (kGy). After irradiation at 8-10 kGy, physicochemical parameters, i.e., pH, turbidity, EC, total suspended solids (TSS) and total dissolved solids (TDS), have decreased sharply and approached to the expected value recommended by Department of Environment (DoE), Bangladesh. At 10 kGy absorbed dose, 59.0 % biological oxygen demand (BOD) and 71.6 % chemical oxygen demand (COD) removal has been achieved, accelerating the enhancement in biodegradability index (BOD/COD). Ammonium and total nitrogen have improved up to 87.0 % and 94.5 % after irradiation at 10 kGy doses. Subsequently, the treated textile wastewater samples were reused to grow plants to inspect the fertility responses. When plants were nourished by textile wastewater irradiated at 8-10 kGy, increased values were observed in the plant morphological parameters such as dry masses of the fruits (from 2.25 to 3.02 g), moisture content (from 91.35 to 92.62%), root length (from 13.21 to 16.56 cm), average plant height (from 2.42 to 4.07 cm/week), average number of leaves (from 14 to 16 nos./week), and total number of fruits (from 25 to 40 nos.) in comparison to those plants nourished by simply water and raw wastewater. The elemental analysis confirmed that negligible amounts of heavy metals were found in fruits at higher absorbed doses. In contrast, helpful macro and micronutrients for plant production were raised to sufficient levels at 8-10 kGy, which can be the optimum doses for gamma irradiation to treat textile wastewater for maintaining sustainable water resources.
本研究聚焦于利用伽马辐射分解纺织废水中的有机污染物并将其再利用为灌溉用水的可能性。废水样本在3、5、8和10千戈瑞（kGy）这四种不同的吸收剂量下进行辐照。在8 - 10 kGy的辐照剂量后，物理化学参数，即pH值、浊度、电导率（EC）、总悬浮固体（TSS）和总溶解固体（TDS）急剧下降，并接近孟加拉国环境部（DoE）推荐的预期值。在10 kGy的吸收剂量下，生物需氧量（BOD）去除率达到59.0%，化学需氧量（COD）去除率达到71.6%，加速了生物降解性指数（BOD/COD）的提高。在10 kGy剂量辐照后，铵和总氮分别提高了87.0%和94.5%。随后，将处理后的纺织废水样本用于种植植物，以检测其肥力响应。当植物用8 - 10 kGy辐照的纺织废水浇灌时，与用单纯水和原废水浇灌的植物相比，观察到植物形态参数值增加，如果实干重（从2.25克增加到3.02克）、含水量（从91.35%增加到92.62%）、根长（从13.21厘米增加到16.56厘米）、平均株高（从每周2.42厘米增加到4.07厘米）、平均叶片数（从每周14片增加到16片）以及果实总数（从25个增加到40个）。元素分析证实，在较高吸收剂量下，果实中重金属含量可忽略不计。相比之下，对植物生长有益的大量和微量营养素在8 - 10 kGy时提高到了足够水平，这可能是伽马辐照处理纺织废水以维持可持续水资源的最佳剂量。
