Abstract
This paper studied the dewatering performance of modified kaolin conditioned sludge, and focused on the molecular composition and transformation of extracellular biological organic matter (EBOM) and supernatant dissolved organic matter (DOM) during the conditioning process. The results showed that the sludge dewatering performance was significantly improved after conditioning with modified kaolin. Under the dosage of 20% DS (200 g conditioner was added to each 1 kg sludge dry solids), the specific resistance to filtration (SRF) of sludge was reduced by 85.05%, the water content of sludge cake was decreased to 66.70%, and the time to filter (TTF) reduction rate was increased to 71.35%. The modified kaolin can broke the structure of sludge floc, which caused the transfer of organic matter from the solid phase to the liquid phase, thus promoting the release of bound water. In this process, the hydrophilic fraction in the inner layer of the sludge floc was released and enhanced the aromaticity of supernatant DOM. The transfer of proteins of the acidic fractions and polysaccharides of each fraction in the sludge EBOM to the supernatant DOM occurred. The reduction of hydrophobic and transitional proteins, hydrophobic and neutral humic acid-like substances, soluble microbial byproducts-like and fulvic acid-like materials in the sludge EBOM facilitated the breakage of the sludge floc.
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