Mohsen Mehdipoor; Mohammad Hadi Dehghani; Simin Nasseri; Kazem Nadafi; Amir Hossein Mahvi
Abstract
Background and objective: One of the industries producing environmental pollutant is the rubber industry, which has a lot of in environmental dangers. This study was conducted in the purpose of investigation on Ozone and coagulant material’s (Aluminum sulfate –Ferric chloride) efficiency ...
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Background and objective: One of the industries producing environmental pollutant is the rubber industry, which has a lot of in environmental dangers. This study was conducted in the purpose of investigation on Ozone and coagulant material’s (Aluminum sulfate –Ferric chloride) efficiency in waste water treatmentof Rubber Industry. Materials and Method: In this work Rubber industries with the industrial waste volume over 2500 m3 per mount was studied. In order to qualitative evaluation of wastewater in this industry, the reduction of turbidity and the amount of COD were considered as the qualitative criteria. Results: In this study, the reduction rate of COD by chemical treatment with Ferric chloride after ozonation was 34 percent and the wastewater of chemical treatment with aluminum sulfate after ozonation shown 48 percent, the reduction of COD. Conclusion: One of the scientific and practical approaches for the treatment of wastewater in these industries is the use of complex process like chemical coagulation and ozonation along with possible biological processes. Paper type: Research article
Nasrin Abdollahi; Mohammad Hadi Dehghani; Kazem Nadafi; Fazlollah Changani; Amir Hossein Mahvi; Niaz Mahdi Esfahani
Abstract
Background and objective: Oil and grease causes damages for aquatic organisms, soil ecosystem, and mutagenic and carcinogenic for human. The aim of this research was to study the reduction of pollution of oil and grease of steel mill wastewater with Air Flotation system. Materials and Method: At first ...
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Background and objective: Oil and grease causes damages for aquatic organisms, soil ecosystem, and mutagenic and carcinogenic for human. The aim of this research was to study the reduction of pollution of oil and grease of steel mill wastewater with Air Flotation system. Materials and Method: At first phase of this examination the sampling performed of raw wastewater for determine amount of oil and grease, COD, TS, TDS, TSS, Turbidity and Alkalinity. The second phase flotation with dispersed air performed at pilot vessel and the second sampling performed for determinationof removal efficiency of oil and grease in 3 different concentration and 4 different retention time and measured for other parameters in best concentration and retention time. Results: The retention time were selected 30, 45, 60 and 90 min and concentrations were 591 mg/l, 386 mg/l and 277 mg/l. removal efficiency for parameters of oil and grease, COD, TS, TDS, TSS, Turbidity, Alkalinity, obtained %48, %46, %37, %36, %82, %89, %6. Conclusion: This study showed with increases of retention time from 30minute to 90minute removal efficiency for all of parameters gently increased but between 60 and 90 minute retention time removal efficiency was almost stable. Removal efficiency in high concentration of oil and grease(591mg/l) was more than removal efficiency in low concentration of oil and grease (277mg/l). Paper type: Research article