Variations in dissolved inorganic carbon species in effluents from large-scale municipal wastewater treatment plants (Qingdao, China) and their potential impacts on coastal acidification

Liu, Xiangyu; Yang, Xufeng; Li, Yunxiao; Zang, Han; Zhang, Longjun

doi:10.1007/s11356-019-04871-2

Cited by 10 publications

(7 citation statements)

References 27 publications

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“…Third, to separate mixing effects, the slope values of [TA-DIC]-Salinity between the composite treated wastewater and seawater in January and June were estimated from end-members values. Treated wastewater end-member values were calculated by the [TA-DIC] values and discharge of three WWTPs in corresponding months which were reported by Liu et al [44]. Though their studies showed that changes in DIC and TA were generally same in the two years, the uncertainties brought by the treated wastewater end-member in our cruises still exist in [TA-DIC] A-mix .…”

Section: Uncertainty Analysis Of the Quantitative Estimatementioning

confidence: 76%

“…The direct input of treated wastewater has become the main form of terrestrial input, and unlike natural rivers affected by seasonal changes, treated wastewater input is a persistent process. The pH values of the treated wastewater from the three WWTPs were 7.16~7.33 in January and 7.44~7.50 in June [44]. The wastewater input with low pH values would directly reduce the Ω arag in the northeastern area of JZB.…”

Section: Qualitative Identification Of the Main Factors Controlling Tmentioning

confidence: 98%

“…Terrestrial runoff usually has low pH and [CO 3 2− ] values, which directly lead to a decrease in Ω arag in the receiving water body [21,43]. The rivers entering JZB have no natural runoff, but the daily discharges of the Licun River WWTP, the Lushan River WWTP and the Haibo River WWTP, which are located at the three estuaries in the eastern area of the bay, are up to 250,000, 100,000 and 160,000 tons, respectively [11,44]. The direct input of treated wastewater has become the main form of terrestrial input, and unlike natural rivers affected by seasonal changes, treated wastewater input is a persistent process.…”

Section: Qualitative Identification Of the Main Factors Controlling Tmentioning

confidence: 99%

“…Thus, the change ratio of [TA-DIC] per unit salinity was obtained. The [TA-DIC] values of the treated wastewater were obtained from Liu et al [44], and the [TA-DIC] value of the freshwater end-member was calculated according to the proportion of three WWTPs' discharge ( ([TA-DIC] I × Q i )/ Q i , Q was the charge, Table 1). The freshwater end-member values were −405 µmol/kg in January and −110 µmol/kg in June.…”

Section: Processes Controlling the Spatial Distribution Of Surface ω mentioning

confidence: 99%

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Spatial Variation in Aragonite Saturation State and the Influencing Factors in Jiaozhou Bay, China

Zhang

Xue

et al. 2020

Water

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Both natural processes and human activities affect seawater calcium carbonate saturation state (Ωarag), while the mechanisms are still far from being clearly understood. This study analysed the seawater surface Ωarag during summer and winter in Jiaozhou Bay (JZB), China, based on two cruises observations performed in January and June 2017. The ranges of Ωarag values were 1.55~2.92 in summer and 1.62~2.15 in winter. Regression analyses were conducted to identify the drivers of the change of Ωarag distribution, and then the relative contributions of temperature, mixing processes and biological processes to the spatial differences in Ωarag were evaluated by introducing the difference between total alkalinity (TA) and dissolved inorganic carbon (DIC) as a proxy for Ωarag. The results showed that biological processes were the main factor affecting the spatial differences in Ωarag, with relative contributions of 70% in summer and 50% in winter. The contributions of temperature (25% in summer and 20% in winter) and the mixing processes (5% in summer and 30% in winter) were lower. The increasing urbanization in offshore areas can further worsen acidification, therefore environmental protection in both offshore and onshore is needed.

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Section: Uncertainty Analysis Of the Quantitative Estimatementioning

confidence: 76%

Section: Qualitative Identification Of the Main Factors Controlling Tmentioning

confidence: 98%

Section: Qualitative Identification Of the Main Factors Controlling Tmentioning

confidence: 99%

Section: Processes Controlling the Spatial Distribution Of Surface ω mentioning

confidence: 99%

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Spatial Variation in Aragonite Saturation State and the Influencing Factors in Jiaozhou Bay, China

Zhang

Xue

et al. 2020

Water

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“…The total amount of daily treated sewage from the three wastewater treatment plants near the northeastern area was 510,000 tons, and the DIC and TA concentrations of discharged sewage were as high as 2554~5173 μmol/kg and 2326~4570 μmol/kg, respectively. Obviously, the direct input of sewage was an important factor for the addition of DIC and TA in the northeastern area (Liu et al, 2019;Yang et al, 2018). The impact of sewage on aquatic environment has been widely reported in China (Yang et al, 2008;Yang et al, 2012).…”

Section: Aerobic Respiration Caused the Bay To Act As A Co2 Source In Early Wintermentioning

confidence: 99%

The spatiotemporal variation and control mechanism of surface pCO2 in winter in Jiaozhou Bay, China

Yang

Zhang

et al. 2020

Continental Shelf Research

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In many mid-latitude coastal waters during winter months, in addition to temperature, the large change in biogeochemical processes often influence and complicate the surface partial pressure of CO2 (pCO2). Based on the hydrological and carbonate parameters in seven cruises, this study analysed the evolution process and explored the control mechanism of the surface pCO2 in Jiaozhou Bay, China, from December to March. The results showed that the pCO2 ranged from 157 μatm to 647 μatm, and the bay represented a sink for atmospheric CO2 (-3.8 mmol m -2 d -1 ) in the whole winter. The non-temperature processes were the dominant factors affecting intra-winter pCO2 variation. In December, the bay was dominated by aerobic respiration and acted as a CO2 source (3.0 mmol m -2 d -1 ). From early January to late February, however, the vigorous growth of cold algae caused strong primary production, and the bay presented as a CO2 sink (from -6.4 mmol m -2 d -1 in early January to -15.5 mmol m -2 d -1 in late February). In March, primary production weakened and the effects of the CaCO3 precipitation appeared, and the strength of the CO2 sink was obviously weakened (-1.1 mmol m -2 d -1 ). Meanwhile, the water temperature decreased gradually from December to late January and then increased until March, and it further expanded the variation range of pCO2. Our results highlight the obvious source/sink change in mid-latitude seawater CO2 in winter, while more field observations are still needed to further understand the complicated biogeochemical processes and its influence on seawater pCO2.

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The Response of Carbonate System to Watershed Urbanization Process in a Semi-Arid River

Li,

Dang,

Huang

et al. 2024

J. Ocean Univ. China

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Variations in dissolved inorganic carbon species in effluents from large-scale municipal wastewater treatment plants (Qingdao, China) and their potential impacts on coastal acidification

Cited by 10 publications

References 27 publications

Spatial Variation in Aragonite Saturation State and the Influencing Factors in Jiaozhou Bay, China

Spatial Variation in Aragonite Saturation State and the Influencing Factors in Jiaozhou Bay, China

The spatiotemporal variation and control mechanism of surface pCO2 in winter in Jiaozhou Bay, China

The Response of Carbonate System to Watershed Urbanization Process in a Semi-Arid River

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