Assessment of Biological Toxicity and Ecological Safety for Urban Black-Odor River Remediation

Abstract

The judgment and assessment of remediation effect on urban black-odor river still depend on the physical-chemical parameters and lack in ecological safety effects. A set of combined biological toxicity tests were applied to evaluate the ecological effects of one urban black-odor river before and after the remediation. The special growth rate of Chlorella vulgaris and mortality rate of Daphnia magna were used to assess acute toxicity. The Salmonella Typhimurium/Reverse Mutation Assay was applied to test the mutagenicity. The tests by C. vulgaris growth showed that there was no inhibition before and after remediation by overlying water, in contrast promoted the growth of C. vulgaris. The tests by D. magna showed slight toxicity on site 3# before remediation and nontoxic after remediation. The mutagenicity of organic extracts from overlying water at all sampling sites were positive before remediation, but were eliminated after remediation except from 3 of 4 sites on TA98 strain. The addition of the liver microsomal S9 induced the positive mutagenicity on site 4# compared to S9 absence. The results clarified the applicable and the importance of the biological toxicity tests on assessing the remediation effect and potential ecological risk of urban black-odor river.

The Physiological and Biochemical Responses of Daphnia magna to Dewatered Drinking Water Treatment Residue

“…The D. magna is commonly employed as a model organism given that it is a common member of aquatic invertebrate communities. Furthermore, D. magna is often considered a bioindicator species for studying environmental contamination because it has a short generation time, can be easily cultivated, and is sensitive to a wide range of contaminants [ 35 , 36 , 37 ]. Accordingly, determining the physiological and biochemical responses of D. magna to the dewatered DWTR could provide essential information about the safety of recycling DWTR in environmental remediation.…”

Ecological Risk Assessment of Three Pesticide Additives in Soil and Application to the Remediation of Contaminated Soil

“…Aquatic organisms at different levels of the food chain respond differently to toxicity. Xu et al (2020) studied the biotoxicity of porewater in black odiferous water and found that the toxicity levels of sediment porewater to D. magna and Chlorella vulgaris were different at the same site. Moreover, various factors in the actual environment can influence the toxic effect, and multiple pollutants in the environment may also have different combined toxicities.…”