The Effect of Environmental Conditions on the Removal of Organic Compounds from Color Sludge Via Bioslurry Method

Sharareh Rashidi¹, Ahmad Halaji Sani² and Shahab Razavi³

¹Chemical Engineering Biotechnology, Islamic Azad University, North Tehran Branch, Tehran, Iran.

²Faculty Member of Engineering Department, Tehran University, Tehran, Iran.

³Chemical Engineering Biotechnology, Islamic Azad University, North Tehran Branch, Tehran, Iran.

DOI : http://dx.doi.org/10.13005/bbra/2582

ABSTRACT: Every industrial activities resultes in the pollution of environment. This pollution could be in the shape of voice, weather, and water or earth pollution. The amount of pollution in industries is different and it depends on the type of industry. So to purify and remove pollution, should know accuracy the amount and the type of pollutants. The sewage in the automotive industry includes 2 parts: Paint sludge produced in the automotive industry has the highest pollutant capability because of weighty elements. So, the removal of it in the wrong way will cause damage to the environment. In this research, a number of experiments were carried out to identify the main pollutants in the paint sludge. In this research, the method of research and data gathering was the use of a slurry bioreactor with the capability of the regulation of the amount of aeration and mixing speed to remove organic compounds of paint sludge. The experiment was designed according to the Taguchi method, which 9 experiments were designed to achieve the desired result. The results of the two experiments showed a significant reduction in the initial COD of 76 and 80% biologically pure and it became clear that aerobic bacteria purify the paint sludge more. Also, after analyzing all the results of Mini-Soft software, optimal purification conditions for effective environmental parameters were pH = 7, stirring speed = 14 rpm, dissolved oxygen concentration = 5.5 ppm. Finally, after the activation of the reactors to filter 1 kg of paint sludge for 30 days and at ambient temperature, the result of the two experiments showed a significant reduction in the initial COD of the biological treatment of 76 and 80%, and it was found that the aerobic bacteria do more the color sludge purification. Also, after analyzing all the results with mini-tab software, the optimum refining condition for effective environmental parameters was pH = 7, active sludge = 0.5 kg, stirring speed = 14 rpm, dissolved oxygen concentration = 5.5 ppm.

KEYWORDS: Color Sludge; Taguchi; Mini-Tab Software

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