Abstract
In order to reduce the impacts on sludge treatment facilities caused by impurities such as fibers, hairs, plastic debris, and coarse sand, an innovative primary sludge pretreatment technology, sludge impurity separator (SIS), was proposed in this study. Non-woven micromesh with pore size of 0.40mm was used to remove the impurities from primary sludge. Results of lab-scale tests showed that impurity concentration, aeration intensity, and channel gap were the key operation parameters, of which the optimized values were below 25g/L, 0.8m3/(m2min), and 2.5cm, respectively. In the full-scale SIS with treatment capacity of 300m3/day, over 88% of impurities could be removed from influent and the cleaning cycle of micromesh was more than 16days. Economic analysis revealed that the average energy consumption was 1.06kWh/m3 treated sludge and operation cost was 0.6yuan/m3 treated sludge.
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