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The aim of the study was to evaluate the effect of organic coagulants on sludge sedimentation and the quality of textile wastewater. The amount of sludge and its sedimentation properties depended on the type of coagulant as well as on the composition and ionic nature of compounds present in the wastewater. In view of the amount of sludge formed it was preferable to use organic coagulants Perrustol IPD and chitosan and a mixed organic-inorganic coagulant Alcat. Depending on the wastewater type, colour reduction was as follows: for Fercat from 38 to 90%, Alcat from 71 to 95%, Perrustol IPD around 65%, chitosan from 72 to 90%, and for ferrous sulfate from 67 to 100%. The reduction of COD depended on the wastewater type: for Fercat it was from 19 to 66%, Alcat from 23 to 81%, Perrustol IPD about 23%, chitosan from 10 to 52%, and ferrous sulfate from 10 to 64%.

Effectt of Using Coagulants on Sedimentation Sludge Properties and Quality of Textile Wastewater