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Table 4

Rural domestic sewage treatment technology evaluation index weight distribution

First-levelWeightSortingSecond-levelWeight
U1: Economic costs 0.0613 U11: Water treatment cost per ton 0.0402 
U12: System maintenance and replacement costs 0.0097 
U13: Unit area system construction cost 0.0114 
U2: Environmental impact 0.3009 U21: Water eutrophication affects the potential value 0.1637 
U22: Greenhouse effect influence potential value 0.0386 
U23: Solid waste 0.0148 
U24: Water consumption 0.0839 
U3: Technical performance 0.5204 U31: Removal rate of TN and TP 0.2816 
U32: Removal rate of COD and BOD 0.0746 
U33: System operating difficulty 0.0359 
U34: Resource efficiency 0.1283 
U4: Scope of application 0.1174 U41: Amount of sewage discharged 0.0319 
U42: Processing efficiency 0.0141 
U43: Supporting conditions 0.0714 
First-levelWeightSortingSecond-levelWeight
U1: Economic costs 0.0613 U11: Water treatment cost per ton 0.0402 
U12: System maintenance and replacement costs 0.0097 
U13: Unit area system construction cost 0.0114 
U2: Environmental impact 0.3009 U21: Water eutrophication affects the potential value 0.1637 
U22: Greenhouse effect influence potential value 0.0386 
U23: Solid waste 0.0148 
U24: Water consumption 0.0839 
U3: Technical performance 0.5204 U31: Removal rate of TN and TP 0.2816 
U32: Removal rate of COD and BOD 0.0746 
U33: System operating difficulty 0.0359 
U34: Resource efficiency 0.1283 
U4: Scope of application 0.1174 U41: Amount of sewage discharged 0.0319 
U42: Processing efficiency 0.0141 
U43: Supporting conditions 0.0714 
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