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The existence of risk factors of wastewaters to high organic materials, phenol compound, chlorinated compound and other complex providing a discharge of receptive waters could be serious hazards created for life in the water. In this study activated sludge/trickling filter (AS/TF) two-step integrated with upflow suspended growth denitrification (USGD) processes operation evaluated for inert chemical matter removal to conventional treatment. From the wastewater activated sludge system of Isfahan with trickling filter used to sequentially. The media from polypropylene, 240 m 2 /m 3  specific area, 1.8 m diameter and 6 m height applied to TF tank instal. Half industrial pilot part of this two-step system operated from 90 days with flow minimum equivalent to 3.6 m3/h until reached steady state. From AS/TF effluent used to feed four reactors in batch condition and lab scale. These reactors along with two reactors to glucose substrate and equivalent COD with other reactors performance from 504 h in the aerobic condition and room temperature (23–26°C). Each of which of soluble inert materials,total soluble COD, degradable suspended materials, degradable COD, refractory suspended materials and degradable soluble materials parameters calculated for single activated sludge (SAS), AS/TF and USGD effluent that mg/l reached for SAS 32, 180, 86, 234, 220 and 148 respectively. These parameters calculated for a two-step system 16, 180, 195,359,111 and 164 and the USGD process as 8, 180, 201, 373, 105 and 172 respectively. The calculations showed when AS integrated to TF in compare with when one applies single is capable inert COD removed two times and for USGD removed four times.

international journal of environmental analytical chemistry

Influence of integrated of activated sludge-trickling filter two-step and upflow suspended growth denitrification processes on the COD fractions in the municipal wastewaters