Abstract
The present study was conducted on Indian Spinach irrigated by groundwater (control) and sevendifferent types of textile dyeing wastewater to assess the suitability for further utilization in vegetablescultivation. The impact of dyeing wastewater was assessed regarding the growth, yield and nutritionalqualities of Indian Spinach. The different types of dyeing wastewater were analyzed for a wide rangeof parameters and compared with irrigation water quality standard. The results revealed that pH,biochemical oxygen demand, dissolved oxygen, chloride and color of the mixed wastewater sample(D8) were exceeded the irrigation water quality standards of Department of Environment, Bangladeshwhile these properties of other wastewater samples were almost within allowable limits. The mixedwastewater was not suitable for irrigation considering the intensity of pollution and yield of IndianSpinach. The average yield of Indian Spinach irrigated with five less polluted wastewater(2 nd wash after scouring and bleaching, enzyme treated wastewater, 2nd wash after dyeing,neutralized wastewater and fixing wastewater) was 58.54 g which was about 28 percent lower thanthe groundwater irrigated Indian Spinach. However, number of leaves, plant canopy area, stemdiameter and plant height did not varied significantly with groundwater treated plant. Nutritionalqualities of Indian Spinach irrigated with wastewater were similar to those irrigated by groundwater.The concentration of ascorbic acid in Indian Spinach irrigated with wastewater was found almostidentical with groundwater irrigated plants. Chlorophyll a and chlorophyll b of different wastewatertreated plants varied from 0.17 to 0.29 mg and 0.05 to 0.08 mg per gm among the treatmentsrespectively while groundwater irrigated Indian Spinach contained in these range. β carotene inwastewater irrigated Indian Spinach was also higher than the groundwater irrigated plant. Fromoverall assessment, selected wastewater of a dyeing factory could be directly reutilized in irrigationpurpose of vegetables cultivation.
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