# Quality Evaluation of Wasteless Mining in Dongguashan Based on Intuitionistic Fuzzy Set and VIKOR
## 4 Case Study
### Overview of the Dongguashan Copper Mine
The surface water treatment of the Dongguashan Copper Mine refers to the Class IV standard in the _Surface Water Environmental Quality Standard_ (GB3838-88) [26;27], and is calibrated to the Class IV standard in the _Surface Water Environmental Quality Standard_ (GB3838-2002) [28], as shown in Table 5.  
Compared with the Class IV standard of the _Surface Water Environmental Quality_ in Table 5, the water quality of the three measurement points meets the relevant standards, indicating  
Figure 3: Comparison of wastewater monitoring results between the standard and the total discharge of the precipitation pond of Dongguanshan Copper Mine Plant. (I—the comparison of the concentration of hazardous substances between the standard and the total discharge of the precipitation pond (a); II—comparison of wastewater monitoring concentration of hazardous substances between the standard and the total discharge of the precipitation pond (b); III—comparison of wastewater monitoring between the PH standard and the total discharge of the precipitation pond). \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Project**} & \multicolumn{3}{c}{**IV Standard Value**} & \multicolumn{3}{c}{**Monitoring Values**} \\ \cline{2-6}  & **GB3838-88** & **GB3838-2002** & \begin{tabular}{c} **Measurement** \\ **Point 1** \\ \end{tabular} & \
\begin{tabular}{c} **Measurement** \\ **Point 2** \\ \end{tabular} &
\begin{tabular}{c} **Measurement** \\ **Point 3** \\ \end{tabular} \\ \hline pH & 6.5–8.5 & 6.0–9.0 & 8.08 & 7.71 & 7.7 \\ CODer & \(\leq\)30 & \(\leq\)30 & 9.7 & 14.7 & 23.3 \\ SS & 38.5–51.5 & & 51.5 & 39.2 & 38.5 \\ Petroleum & \(\leq\)0.5 & \(\leq\)0.5 & 1.35 & 1.63 & 1.13 \\ Sulfide & \(\leq\)0.5 & \(\leq\)0.5 & 0.02 & 0.02 & 0.02 \\ Total Copper & \(\leq\)1.0 & \(\leq\)1.0 & 0.009 & 0.014 & 0.05 \\ Total Lead & \(\leq\)0.05 & \(\leq\)0.05 & 0.013 & 0.013 & 0.013 \\ Total Zinc & \(\leq\)2.0 & \(\leq\)2.0 & 0.007 & 0.021 & 0.022 \\ Total Cadmium & \(\leq\)0.005 & \(\leq\)0.005 & 0.002 & 0.002 & 0.002 \\ Chromium & \(\leq\)0.05 & \(\leq\)0.05 & 0.004 & 0.004 & 0.004 \\ Total Mercury & \(\leq\)0.001 & \(\leq\)0.001 & 0.0004 & 0.00004 & 0.00004 \\ Total Arsenic & \(\leq\)0.1 & \(\leq\)0.1 & 0.0023 & 0.0053 & 0.0033 \\ Dissolved iron & \(\leq\)0.5 & \(\leq\)0.3 & 0.429 & 0.235 & 0.826 \\ \hline \hline \end{tabular} Note: Measurement point 1 in the table is 500 m upstream of the confluence of Hongxing River and Dongguanan Copper Mine’s total sewage ditch; measurement point 2 is 1000 m downstream of the confluence of Hongxing River and Dongguanan Copper Mine’s total sewage ditch; measurement point 3 is 4000 m downstream of the confluence of Hongxing River and Dongguanan Copper Mine’s total sewage ditch.  
\end{table} 
Table 5: Surface water environmental quality IV standard indicators and detection values Unit: mg/L (pH is dimensionless). that the production of the Dongguashan Copper Mine does have a negative impact on the surface water. The research and monitoring results of the groundwater situation show that the groundwater environmental situation is also good and meets the provisions of the Class III standard in the _Groundwater Quality Standard_ GB(T14848-2017) [29]. In summary, based on China's national standards, the wastewater treatment effect of wasteless mining in the Dongguashan Copper Mine is obtained as pollution-free, and the mine production does not pollute the groundwater;  
(4) Exhaust gas emissions  
The impact of dust on air quality is mainly considered in the air pollution evaluation of Dongguashan Copper Mine. For the odorous and toxic disorganized emission gases from the pharmaceutical preparation room, the test room and the laboratory, the enterprise set up facilities such as axial flow fans to reduce the air pollution from the mine production.