Guangming Zeng and colleaguesat the Hunan University, Changsha, used the Analytic Hierarchy Process and a technique called Grey Relation Analysis (GRA) to evalute four wastewater treatment alternatives - Economic (attributes 1-3 at second level)
- Technical (4-7)
- Administrative (8)
- Capital cost
- O and M cost (Operation and Maintenance)
- Land area
- Removal efficiency (of nitrogenous and phosporus pollutants)
- Sludge disposal effect
- Stability of plant operation
- Maturity of technology
- Professional skills required for O and M
- Anaerobic/anoxic/oxic (A2/O)
- Triple oxidation ditch
- Anaerobic single oxidation ditch
- Sequencing batch reactor (SBR)
Source unclear but for attributes 4-8 based on expert grading on scale of excellent, good, moderate, poor and very poor translated as .9, .7, .5, .3 and .1. Economic criteria based on objective data. The details of GRA are not presented at second level so it is not possible to explain the major difference between the authors' concluding analysis, reported at top level (slide 1), and the results from second level analysis using raw  Ratings (slide 2) or idealised ratings (slide 3) Elicited by AHP intensity of preference method but not clear from whom and should probably be taken as illustrative. Reflect Ratings and Weightings. Note the major ranking changes between slide 1 and slides 2/3 Guangming Zeng, Ru Jiang, Guohe Huang, Min Xu and Jianbing Li (2007) 'Optimization of wastewater treatment alternative selection by hierachy grey relational analysis' Journal of Environmental Analysis 82: 250-259. Email author: zgming@hnu.cn The purpose of presenting an Annalisa version of a study conducted using another MCDA method (such as the Analytic Hierarchy Process) is to summarise and present the analysis in a simple and attractive one-screen format for a large audience - and to permit the interested viewer to download the .alt file and interact with the Weightings and Ratings to determine the effect of changes on the Scores. Alternatively the .alt file may be used as a 'starter' for a new analysis. No opinion is expressed or implied in regard to the merits of the study on any criterion
download alt file here
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