Combined toxic effects of nitrite and ammonia on life history traits of Daphnia pulex

Yu, Bo; Lyu, Kai; Li, Jiajia; Yang, Zhou; Sun, Yunfei

doi:10.3389/fenvs.2022.1019483

Cited by 2 publications

(1 citation statement)

References 46 publications

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“…Ammonia and nitrite are common toxic nitrogenous pollutants for organisms in aquatic ecosystems, and dissolved oxygen is important for living organisms. These three parameters are crucial to the health of aquatic organisms [40,41]. Our findings further demonstrate that the deterioration in water quality in Tai O Village, caused by inadequate sewage treatment and the influx of tourists, could potentially threaten the adjacent coastal wetland ecosystems in Tai O.…”

Section: Spatial Variation Of Water Quality Among the Different Sampl...mentioning

confidence: 53%

The Impact of Anthropogenic Pollution on Tidal Water Quality in Mangrove Wetlands

Lam,

et al. 2023

JMSE

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Mangrove wetlands are vulnerable coastal ecosystems that provide critical habitats for aquatic life. Tai O is a popular tourist village on Lantau Island, Hong Kong, which is surrounded by mangrove wetlands with rich biodiversity; and this village is also famous for its traditional stilt houses. However, the untreated municipal sewage from some stilt houses is directly discharged into nearby tidal channels, potentially threatening health of the adjacent mangrove wetlands. In order to evaluate the anthropogenic impact on these wetlands and identify the potential sources of their pollution, this study aimed to evaluate spatial (at the sampling points) and temporal (during weekdays and weekends) differences in the quality of their tidal water, and examine relationships between the water quality and the density of the stilt houses. The results indicated that the water quality was worse during weekends. The ammonia concentrations in most samples exceeded the limits of the Hong Kong Water Quality Objectives, China’s Sea Water Quality Standards, and even the U.S. EPA criterion for fish reproduction. This high ammonia input could potentially adversely affect the mangrove ecosystem, underscoring the need for further comprehensive studies. Moreover, some of the weekend water samples had lower dissolved oxygen levels and were polluted by phosphate. Our Principal Component Analysis revealed that water quality was correlated with stilt house density, suggesting that anthropogenic inputs of untreated sewage was the major source of pollution. These findings highlight that nutrients released from human activities, particularly ammonia and phosphate, must be controlled for a better protection of mangrove wetland ecosystems.

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Section: Spatial Variation Of Water Quality Among the Different Sampl...mentioning

confidence: 53%

The Impact of Anthropogenic Pollution on Tidal Water Quality in Mangrove Wetlands

Lam,

et al. 2023

JMSE

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Charcoal stabilizes pH and improves nutrients removal of bacteria-microalgae interaction: A potential for improving water quality in aquaculture

Salisu¹,

Umar²,

Zhong³

et al. 2023

Environmental Engineering Research

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Aquaculture is prone to pH fluctuations depending on dominating microbial pathway in the management. The present study takes advantage of the influence of pH in changing the properties of charcoal to condition the pH and improve nutrient removal. Two Synthetic aquaculture wastewaters of 100 mg/L TAN were designed to test the pathway's nutrient removal and pH stability. Glucose at 15 C/N was added to one wastewater, favoring heterotrophic pathway. The other was free of organic carbon, favoring autotrophic pathway. Powdered charcoal was added to each pathway at 0.5, 1.0, 2.0, and 4.0% (charcoal weight/volume of media) compared to the 0 % group without charcoal. The result revealed that as charcoal percentages increase, the pH shifts towards stabilization and improves nutrient removal (<i>p</i> ≤ 0.05). At 4.0% charcoal, the pH was stabilized at 6.0 – 7.5 in heterotrophic and 7.5 – 7.9 in autotrophic pathways, which are within the optimum range for the survival of aquatic organisms, corresponding to the removal efficiency of TAN (99.96 and 50 %), and phosphate (55 and 17 %) within 6 days. Hence, for every 100 mg/L of TAN in wastewater, 4.0% of the wastewater volume as charcoal could stabilize pH and improve microbial nutrient removal.

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Combined toxic effects of nitrite and ammonia on life history traits of Daphnia pulex

Cited by 2 publications

References 46 publications

The Impact of Anthropogenic Pollution on Tidal Water Quality in Mangrove Wetlands

The Impact of Anthropogenic Pollution on Tidal Water Quality in Mangrove Wetlands

Charcoal stabilizes pH and improves nutrients removal of bacteria-microalgae interaction: A potential for improving water quality in aquaculture

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