Technical assistance: Problems with aerobic contact treatment; seeking expert help
Thread Content
This post was last edited by hesonchang214 on 2011-12-25 at 20:27. Recently, problems have arisen in the aerobic contact tank of the factory’s wastewater treatment system: there is a large amount of foam on the surface of the aeration tank, the effluent is milky and turbid, and the efficiency of COD removal has dropped sharply; the system is now almost non-functional. Experts are requested to analyze the causes and share their insights! Thank you
What is the color of the foam? Is the foam easy to break, what is its viscosity, and has it been examined under a microscope? The possible reasons for the appearance of a large amount of foam are as follows: it is milky white in color due to detergents ； When the biochemical system is affected by toxic substances, the foam becomes darker in color, is less likely to break apart, and the quality of the effluent water is poor ； If the influent contains oils and fats, the age of the sludge is too long, or the pH is too low, then an excessive growth of Bacillus species can result in brown or gray-brown foam that is sticky and difficult to remove. What are the properties of raw water? Was microscopic examination of the microorganisms performed after the decrease in COD removal rate? How about SV30?
Could you tell me what’s going on? I might be able to help you. QQ: 18087632. Please mention where you heard about me when adding me as a friend
How is the water quality? Is it due to sulfur content or an excessive COD load?
Reply to 4# Yuru Yucheng: It contains 1500mg/L of sulfate ions, right?
This is definitely caused by a significant change in the quality of the water entering the system. The presence of foam may be due to a high level of surfactants, which reduces the efficiency of oxygenation of the sludge; as a result, the activity of the sludge decreases, leading to low COD degradation. It is necessary to identify the cause before taking any corrective actions.