Growth and efficiency of nutrient removal by Salix jiangsuensis J172 for phytoremediation of urban wastewater

Abstract

Willows are a group of versatile tree species that may have multiple environmental applications. In the present study, Salix jiangsuensis J172 plants were grown in the fixed mats as an economic plant-based treatment system to evaluate its potential for removing nutrients in wastewater. Plants grew normally in wastewater compared with those in Hoagland solution. However, wastewater containing a high concentration of chlorine ions was toxic to S. jiangsuensis J172 plants. The plants accumulated large amounts of nitrogen and phosphorus in aboveground tissues under conditions of abundant supply. The removal efficiency for raw wastewater was 82.18-87.78 % for nitrogen, 57.35-65.58 % for phosphorus, and 58.24-59.90 % for chemical oxygen demand. Nutrient removal efficiency was positively correlated with the initial nutrient supply. The results show that S. jiangsuensis J172 grown in the fixed mat economic plant-based treatment system with nutrient-rich, eutrophic water may be an effective, low-cost phytoremediation technology to treat water containing undesirable levels of wastewater.

Efficiency of Treated Domestic Wastewater to Irrigate Two Rice Cultivars, PK 386 and Basmati 515, under a Hydroponic Culture System

“…Previous studies have found that saplings irrigated with untreated textile wastewater had shorter length and weight [59][60][61]. As far as the Hoagland solution is concerned, studies also endorsed its efficacy in synthesizing bacterial strains that may be helpful in the treatment of different wastewaters and assist in the growth of crop plants [53]. In our work, the Hoagland solution fulfilled the same purpose.…”

“…Moreover, it was concluded from these readings that the treatment UTDWW has a negative impact, even with the Hoagland solution. This may be due to the presence of toxic compounds in domestic wastewater that overshadowed the benefits of the Hoagland solution [53]. Previous studies have also shown reduction in seedling length (mainly root length) as compared to the control when grown in raw wastewater mixed with the Hoagland solution in a hydroponic system [31,33,[36][37][38][39].…”