No abstract

This research investigated the fate of organic pollutants in each unit of a full-scale O 3 -BAC (biological activated carbon) drinking water treatment plant with micro-polluted raw water under different temperatures. Total organic matters were largely removed with low DBPs (disinfection by-products) formed. Large molecules were broken into smaller ones by O 3 and middle-sized ones totally removed. Concentration of polysaccharide decreased except under high temperature. Small molecule contaminant species of refractory indus trial additives, hydrocarbons, aromatics, herbicides, possible DBPs, etc., were detected. Some species passed through treatment process, some were removed and also new species formed.

Dehydrated sludge with two concentrations of total suspended solids (high: 50 g/L TSS; low: 20 g/L TSS) were studied for 20 d to investigate the effects of anaerobic fermentation on sludge properties. The results showed that the soluble chemical oxygen demand (SCOD) of high-concentration sludge was 16.53 g/L, much higher than that from the low one. The SCOD/total nitrogen ratio of high-concentration sludge varied from 8 to 14.29 g/g, indicating that the sludge could serve as a carbon source for biological denitrification. High-concentration sludge showed a short-chain fatty acid yield of 11.29 g COD/L, much higher than that from low-concentration sludge. The specific resistance of the sludge to filtration (SRF) increased with fermentation time. The quantity of low-speed centrifugation substances (LSCS) was the main factor that influenced the reduction of dehydration. The correlation coefficient between the SRF and protein content in the LSCS layer was significantly positive.

Enhancement of UVC inactivation of coliphage MS2 by sodium alginate and its mechanisms through reactive oxygen species (ROS) generation.