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Table 2 The levels used in the parameters used in the test

From: Improved biodegradability of hardly-decomposable wastewaters from petrochemical industry through photo-Fenton method and determination of optimum operational conditions by response surface methodology

Parameters -alpha Low Center High +alpha
COD initial 1000 1375 1750 2125 2500
H2O2 1000 1750 2500 3250 4000
Fe2+ 500 1125 1750 2375 3000
TDS 4500 6250 8000 9750 11,500
(BOD/COD)IN 0.09
pH 3