Most of quality indices have been developed until now are about surface water,what is the reason that quality index for treated effluent has not been developed until now?
It is possible if we have comprehensive data on treated effluent of wastewater of that particular region or existing standard values from some published sources.
Do you think I should use expert judgment for finding the subindices weights or other methods are existed?would you please guide me?
The Water Quality Index (WQI)1 is similar to the Trophic State Index (TSI) in that both are used for the statewide assessment of surface waters: the 305(b) Report. WQI is used for streams, black waters (natural tea and coffee-colored waters), and springs, while TSI is used for lakes and estuaries.
The effluent quality index (EQI) is meant to quantify the effluent pollution load to a
receiving water body in a single variable. The EQI is the weighted sum of the pollution loads due to (1) total suspended solids (TSS), (2) chemical oxygen demand (COD), (3) biological oxygen demand after 5 days (BOD5), (4) total Kjeldahl nitrogen (TKN), (5) nitrates and (6) total phosphorus (TP) over one complete year. The used weights are based on Vanrolleghem et al. (1996) .
Water Quality Index is calculated according to FDEP. Integrated Water Quality Assessment for Florida: 2006 305(b) Report & 303(d) List Update., Appendix C. See also, Impaired Waters Rule
maybe this paper will help? it looks at wastewater from shrimp farm.
Ferreira N.C., Bonetti C., Seiffert W.Q. 2011. Hydrological and Water Quality Indices as management tools in marine shrimp culture. Aquaculture 318, 425-433
that paper uses the Hydrological index and the Canadian water quality index
The county of Honolulu, Hawaiian Archipelago, has been monitoring its sewage outfalls for more than 20 years by researchers at the University of Hawaii Water Resources Research Center. We are looking at the effects of primary and secondary treated effluents on the benthic fauna (i.e. crustaceans, polychaete worms, micromollusks, fish, etc.) at the zone of mixing, with two so-called control sites. They are also documenting sediment parameters: (i.e. ORP, TOC, TKN, grain sizes, etc.). One must consider that tropical conditions with steep coastlines in Hawaii are totally different from North America (temperate conditions with the presence of a large continental shelf).
The benthic organisms (presence of indicator species) found at these sites can indicate whether or not the sewage effluence is detrimental to the surrounding environments
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