Precautions and methods for adding aerobic excess sludge to anaerobic tanks
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In our plant, the acrylic acid-based water and acrylate-based water are mixed in a mixing tank; after that, they go to the anaerobic tank for treatment, then to the aerobic tank, and subsequently to the secondary sedimentation tank. Part of the wastewater is recycled back to the aeration tank, while another part is dehydrated using a centrifuge (with flocculants added during this process), resulting in dry sludge. At present, since the effluent from the anaerobic tank contains sludge, the concentration of the activated sludge in this tank decreases over time. As a result, our plant now feeds the excess sludge from the aerobic tank directly into the anaerobic tank, using a circulation pump to circulate the sludge. During the anaerobic treatment phase, little or no new feed is added, allowing the sludge to undergo anaerobic decomposition. We would appreciate it if experts could advise us on what precautions should be taken in this approach, as well as share any experience they might have
It is best to leave it in an anaerobic environment for a week first before using it
Our company’s approach is to add hydrolysis-acidification between the aerobic and anaerobic stages