More frequently drying-rewetting is likely to be expected for soils this century, with strong effect on nitrogen transformation. Experiments were conducted in semi-disturbed soils which were incubated under 4 different moisture regimes (dry wet\constant wet\constant dry\constant flooded) for 71 d. The results show that the dry soil has a rapid NO3--N increase after rewetting. Drying-rewetting increases soil nitrification which shows a "pulse" increasing. The drying and rewetting soil has the highest nitrification intensity when the soil moisture content (g/g) ranging at 15.82% ~ 17.06%. Drying-rewetting contributes to the accumulation of NO3--N.
Keratin sponge film was prepared from feather reduction residues, and influence of glycerol content on film’s characters and removal of aerosol were investigated. With increasing glycerol content, the elongation at break, porosity and air permeability increased together with looser structure of the film, while the inhalable particles removal rate decreased. The tensile strength increased when the glycerol content was below 5%, while the glycerol content exceeded 5% decreased. The film with 5 % glycerol content showed the best mechanical character, thermostability and flexibility. The air permeability was 368 mm/s, film's removal rate of PM10, PM2.5 and PM1.0 were 98.3 %, 39.28 % and 32.97 % respectively in air speed of 1 m/s. As a material made from natural resources, it was highly affinitive and had great potential in mask manufacture.
The successful cultivation of aerobic granular sludge used for simultaneous nitrogen and phosphorus removal in sequencing batch reactor (SBR) was performed using a synthetic domestic wastewater and conventional flocculent activated sludge as seeding sludge. The removal efficiency of sludge for chemical oxygen demand (COD),ammonia nitrogen and phosphate was 92.4%,88.1% and 95.9%, respectively. After screening, a strain was obtained with high efficient in nitrogen and phosphorus removal. By analyzing, the strain was identified as Raoultella ornithinolytica. After strain accumulation, the strain cultured at 30°C for 24h. The ammonia nitrogen and phosphate removal efficiency were 78.3% and 92%, respectively.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.