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Abstract: Over the years, the Shaying River Basin has experienced frequent instances of river pollution. The presence of numerous critical pollutant discharge enterprises and sewage-treatment plants in the vicinity of the Shaying River has transformed it a major tributary with relatively serious pollution challenge within the upper reaches of Huaihe River Basin. To study the sources of manganese (Mn), chromium (Cr), nickel (Ni), arsenic (As), cadmium (Cd) and lead (Pb) in Shaying River water, 123 sets of surface water samples were collected from 41 sampling points across the entire basin during three distinct phases from 2019 to 2020, encompassing normal water period, dry season and wet season. The primary origins of heavy metals in river water were determined by analyzing the heavy metal contents in urban sewage wastewater, industrial sewage wastewater, groundwater, mine water, and the heavy metal contributions from agricultural non-point source pollution. The analytical findings reveal that Mn primarily originates from shallow groundwater used for agricultural irrigation, While Cr mainly is primarily sourced from urban sewage treatment plant effluents, coal washing wastewater, tannery wastewater, and industrial discharge related to metal processing and manufacturing. Ni is mainly contributed by urban sewage treatment plant effluents and industrial wastewater streams associated with machinery manufacturing and metal processing. Cd primarily linked to industrial wastewater, particularly from machinery manufacturing and metal processing facilities, while Pb is predominantly associated with urban sewage treatment plant effluents and wastewater generated in Pb processing and recycling wastewater. These research provides a crucial foundation for addressing the prevention and control of dissolved heavy metals at their sources in the Shaying River.
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Key words:
- Industrial waste /
- Urban sewage /
- Mine water /
- Agricultural non-point source pollution
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Table 1. The average heavy metal concentrations in river water of the Shaying River Basin at different time periods
Date Cr Mn Cd Ni As Pb Data source μg·L−1 The Shaying River Basin December 2018 0.38 56.82 0.14 0.95 2.87 0.96 Chu, 2001 December 2019 0.34 5.58 0.04 2.44 1.83 0.04 this study May 2020 0.23 7.54 0.03 1.62 3.33 0.10 this study August 2020 0.27 2.12 0.04 1.58 3.90 0.05 this study Category III in Environmental Quality Standard for Surface Water 50 100 5 20 50 50 GB 3838—2002 Table 2. Test results of heavy metal concentration in the Shaying River Basin
Items Normal season (December 2019) Dry season (May 2020) Wet season (August 2020) AVG S.D. MIN MAX AVG S.D. MIN MAX AVG S.D. MIN MAX μg·L−1 River water Cr 0.34 0.19 0.07 0.90 0.23 0.13 0.09 0.52 0.27 0.12 0.09 0.60 Mn 5.58 16.49 0.05 78.21 7.54 24.29 0.13 112.58 2.12 7.43 0.08 43.9 Cd 0.04 0.02 0.01 0.13 0.03 0.04 0.00 0.22 0.04 0.06 0.01 0.35 Ni 2.44 1.57 0.18 5.90 1.62 1.41 0.00 8.24 1.58 0.95 0.30 4.59 As 1.83 1.02 0.01 4.81 3.33 1.43 0.30 6.04 3.90 2.08 0.52 8.84 Pb 0.04 0.03 0.00 0.16 0.10 0.14 0.00 0.66 0.05 0.08 0.00 0.49 Note: AVG: Average; SD: Standard deviation; MIN: Minimum; MAX: Maximum Table 3. Concentrations of heavy metals and relevant water environment quality standards in different river basins
Data in relevant water basin Cr Mn Cd Ni As Pb Data sources μg·L−1 Chaohu Lake Basin 0.48 22.89 5.8 2.62 — 1.34 Wu et al. 2018 Taihu Lake Basin — — 0.93 — 9.87 45.88 Wang, 2016 Jiulongjiang River Basin 5.41 — 0.08 3.99 12.39 4.47 Chen et al. 2018 Middle and lower reaches of the Han River in the dry season — 17.35 0.00 — 0.07 0.54 Wang et al. 2019 Middle and lower reaches of the Han River in the wet season — 16.88 0.00 — 2.88 0.35 Wang et al. 2019 The Shaying River Basin 2018 0.38 56.82 0.14 0.95 2.87 0.96 Ding et al. 2019 December 2019 0.34 5.58 0.04 2.44 1.83 0.04 this study May 2020 0.23 7.54 0.03 1.62 3.33 0.10 this study August 2020 0.27 2.12 0.04 1.58 3.90 0.05 this study Category III in Environmental Quality Standard for Surface Water 50 100 5 20 50 50 GB 3838—2002 Table 4. List of soluble metal concentrations monitored by enterprises in the Shaying River Basin
Rivers Administrative districts Categories of pollutant discharging enterprises Enterprise quantity Enterprise scale The concentration of soluble heavy metal discharge/μg·L−1 Monitoring date Mn Cr Ni As Cd Pb Jialu River Xingyang Pharmacy production 1 Middle scale, Type II 14 31/3/2021-14/3/2022 Printing equipment manufacturing 1 Middle scale, Type II 15-86 26/2/2021-14/3/2022 Wastewater treatment 3 Small scale 4-15 0.05-0.8 0.4-4 1-12 26/1/2021-7/12/2022 Zhengzhou Municipal District Wastewater treatment 8 3 large scale, Type II, 3 middle scale, Type I, 2 small scale 16-80 0.3-1.3 1-2 1-50 1/1/2021-22/12/2022 Zhongmu Wastewater treatment 1 Small scale ND 2-2.1 20-21 15/1/2021-11/12/2022 Automobile parts manufacturing 1 Large scale, Type II 60-230 1/1/2021-31/12/2022 Weishi Wastewater treatment 2 1 large scale, Type II, 1 small scale. 0.24-40 0.4-30 0.05-3.9 0.09-13 14/1/2021-9/12/2022 Tannery 1 Middle scale, type I 0.35-0.4 4/4/2021-5/9/2021 Fugou Wastewater treatment 2 Small scale ND 0.4-1.52 2-6 ND 2/3/2021-1/12/2021 Xihua Tannery 1 Small scale 15-950 19/1/2021-22/4/2022 Ying River Xinmi Electroplating plants 1 Middle scale, Type II 30-190 2/1/2021-31/12/2022 Wastewater treatment 2 1 middle scale, Type I,1 middle scale, Type II 12-24 0.15-0.5 0.25-4 1.25 13/1/2022-7/7/2022 Xinzheng Wastewater treatment 2 1 middle scale, Type I, 1 small scale. ND ND ND ND 14/1/2021-7/12/2022 Coal mining 1 Large scale, Type II ND 3-4 1-8 6/1/2021-5/12/2022 Dengfeng Wastewater treatment 1 Middle scale, Type I 4-30 0.3-1 0.8-30 1-50 2/3/2021-/810/2022 Jian'an Wastewater treatment 2 1 middle scale, Type I, 1 small scale 4-6 0.8-3.7 0.1-0.2 2-8 18/1/2020-8/10/2022 Coal mining and washing 1 Large scale, Type II 15-910 0.5-80 0-5 0-200 21/1/2021-9/10/2022 Yanling Wastewater treatment 1 Middle scale, Type I 3-12 2-52 1-5 3-4 24/9/2021-18/1/2022 Yuzhou Wastewater treatment 3 Small scale 0-18 0-0.3 0-1 0-10 5/1/2021-6/12/2022 Coal mining and washing 1 Large scale, Type II 80-210 50-95 0.3-350 1 0-10 12/1/2021-7/3/2022 Changge Tannery 1 Middle scale, Type II 70-102 13/5/2021-21/12/2022 Wastewater treatment 2 Small scale 4-7 ND 2.3-4.5 0.1-0.2 1-10 31/3/2021-4/11/2022 Linying Wastewater treatment 2 Small scale 0.01-0.03 0.05-0.021 0.5-1 1-13 14/1/2021-1/12/2022 Xihua Wastewater treatment 1 Small scale ND ND ND ND 19/1/2021-20/10/2022 Beiru River Ruyang Wastewater treatment 2 Small scale 38-53 1-6.2 0.1-2.8 1-15.3 1/1/2021-21/12/2022 Ruzhou Wastewater treatment 1 Middle scale, Type I 0.3-30 0-1 0-10 14/3/2021-16/9/2022 Jiaxian Wastewater treatment 2 Small scale 0.4-0.6 0-4 0-7 23/1/2021-8/11/2022 Xiangcheng Wastewater treatment 3 2 small scale 36-51 0.3 1-5 10-20 1/1/2021-29/11/2022 Sha River Lushan Wastewater treatment 3 Middle scale, Type II ND ND ND 5/1/2021-23/12/2022 Yexian Wastewater treatment 1 Small scale ND ND ND 8/1/2021-1/12/2022 Shilong Wastewater treatment 1 Small scale ND ND ND 18/1/2021-2/4/2021 Pingdingshan municipal district Wastewater treatment 4 Middle scale, Type I 0-19 0.7-46.3 0.4-16.2 1-844 8/1/2021-10/10/2022 Luohe municipal district Wastewater treatment 6 1 middle scale, Type I, 4 middle scale, Type II, 1 small scale 4-92 0.1-30 20 0.1-30 0.3-2.5 0.2-90 2/1/2021-24/12/2022 Shangshui Wastewater treatment 2 Middle scale, Type II 20-100 0.3-0.8 0.025-2 30-90 30/1/2021-31/12/2022 Xiangcheng Tannery 5 4 middle scale, Type II, 1 small scale 30-149 20/1/2021-31/12/2022 Wastewater treatment 1 Small scale ND 0-0.4 0-8 40 20/1/2021-9/12/2022 Jieshou Lead processing and recycling 7 39-44 3.8-4.3 7.1-8.9 59-80 Q4 2021 Taihe Metal processing and recycling 4 3.2-25 50-90 1.1-5 0.1-18 3-70 1/7/2020-19/4/2021 Fuyang municipal district Metal processing and recycling 3 3-80 Note: 1) The data is from the enterprise self-monitoring platform of the Ecological Environment Department in Henan Province and Anhui Province;2) ND represents a test indicator not detected. -
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