Treatment performance was evaluated by measuring
several parameters of influent and effluent, two or three times per week. Chemical oxygen demand (COD), biochemical oxygen
demand (BOD5), total and volatile suspended solids (TSS
and VSS), total Kjeldahl nitrogen (TKN), ammonia (NeNHþ
4 ),
total phosphorus (P) and pH were determined using standard
methods (APHA and AWWA, 1998). Total nitrogen (TN) was
measured by means of a carbon analyzer (model 5050) with an
additional total nitrogen measuring unit (model TNM-1) by
Shimadzu Co Japan. Oxidised nitrogen (NeNOx) was calculated
as the difference between TN and TKN. Total surfactants
were calculated by summing anionic (MBAS; 5540 C), non ionic
(LCK 333 of Dr. Lange; DEV H23) and cationic (LCK 331 of Dr.
Lange; DEV H 20) surfactants. Colour removal was evaluated
as decolourization percentage, measuring the absorbance of
the samples in quartz cuvettes with a 1 cm path-length at
three wavelengths (426 nm, 558 nm and 660 nm)
Treatment performance was evaluated by measuringseveral parameters of influent and effluent, two or three times per week. Chemical oxygen demand (COD), biochemical oxygendemand (BOD5), total and volatile suspended solids (TSSand VSS), total Kjeldahl nitrogen (TKN), ammonia (NeNHþ4 ),total phosphorus (P) and pH were determined using standardmethods (APHA and AWWA, 1998). Total nitrogen (TN) wasmeasured by means of a carbon analyzer (model 5050) with anadditional total nitrogen measuring unit (model TNM-1) byShimadzu Co Japan. Oxidised nitrogen (NeNOx) was calculatedas the difference between TN and TKN. Total surfactantswere calculated by summing anionic (MBAS; 5540 C), non ionic(LCK 333 of Dr. Lange; DEV H23) and cationic (LCK 331 of Dr.Lange; DEV H 20) surfactants. Colour removal was evaluatedas decolourization percentage, measuring the absorbance ofthe samples in quartz cuvettes with a 1 cm path-length atthree wavelengths (426 nm, 558 nm and 660 nm)
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