Acidic wastewater with excessive iron ions
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Why is sludge recirculation needed after the radial flow settler? Is it to enhance the flocculation effect? I hope an expert can explain in detail: regarding water inflow in pyrite mines, the HDS treatment technology, acidic wastewater – where pH is adjusted using lime slurry in a mixing reaction tank, followed by passage to an aeration tank, then to a chemical dosing mixing tank (PAM), and finally to an radial flow sedimentation tank. In this process, part of the sludge goes to a sludge concentration tank while another part is recycled, with a recycling ratio of 100%. The clear water from the radial flow sedimentation tank goes to a pH adjustment tank. Are the pumps and pipelines in this section designed based on a flow rate of 2Q corresponding to the amount of sludge?
The purpose of sludge recirculation is to stabilize the sludge concentration as well as the microbial population concentration.