The efficiency of coagulation treatment wastewater by reagent obtained from waste alumina production
Keywords:Red mud, Acid activation, Coagulation, Dyes, Surfactants, Coagulation reagent, Wastewater
Background. The accumulation of industrial waste is one of the most urgent problems. So, development of complex technology utilization of wastes (red mud) is most economically and environmentally attractive way to solve the problem of red mud accumulation and getting of highly efficient purification reagents that was obtained from secondary raw materials.
Objective. The synthesis of coagulation reagents of water purification by acid activation of waste alumina production and test possibility of reagents using in wastewater treatment technology from the organic component.
Methods. Photometric analysis methods of initial components and products of coagulation cleaning.
Results. It is found that rational conditions of the red mud processing are: acid activation temperature from 150 to 250 °C; weight ratio of acid to red mud 0.5–2; process duration from 30 to 60 minutes. The high coagulation properties of reagents that was synthesized from waste was established and it was confirmed a high efficiency (82–96 %) treatment of wastewater that was contaminated with organic dyes and surfactants.
Conclusions. It was established that all synthesized samples of coagulation reagents from industrial wastes (red mud and hydrolytic sulfuric acid) are effective coagulants and can be used in water purification technology. Thus, when the “Bright-blue HF” dye concentration in the water 10 mg/l, cleaning efficiency was 96 % at the dose of coagulation reagent 200 mg/l.
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