Removal of nitrogen from wastewater is a national concern. Because of its impact on the environment, the USEPA has established limits for safe drinking water of 10 mg/l of water. Salt-water estuaries are also threatened by this productivity-limiting nutrient. Given an inventory in the United States of over 26 million septic systems, that discharge of nitrogen biological denitrification is consi...

this study investigated the occurrence and removal of 12 antibiotics (ciprofloxacin, enrofloxacin, levofloxacin, norfloxacin, nalidixic acid, azithromycin, clarithromycin, roxithromycin, lincomycin, novobiocin, sulfamethoxazole, trimethoprim) at four sewage treatment plants (stps): two stps in kyoto, japan and two stps in beijing, china. the stps differed in design and operation conditions, uti...

The vertical separation of organic matter formation from respiration can lead to net carbon sequestration within the ocean’s interior, making the biological pump an important component of the global carbon cycle. Understanding the response of the biological pump to the changing environment is a prerequisite to predicting future atmospheric carbon dioxide concentrations. Will the biological pump...

The construction of large-scale water reservoir facilities in transboundary river basins always arouses intense concern and controversy. Grand Ethiopian Renaissance Dam (GERD) under Ethiopia is perceived to affect security Egypt Sudan. Therefore, this study investigated the sediment balance Blue Nile River (BNR) basin identified spatio-temporal variation yields along with GERD using Integrated ...

Replacing annual row crops with perennial grasses for bioenergy represents a landscape-level change in species composition, with the potential to impact annual soil nutrient removal on a regional scale. In this study we measured the concentration of ten essential nutrients in harvested material from three potential perennial bioenergy crops: Panicum virgatum L., Miscanthus giganteus, and a rees...

An approach is presented for the on-site treatment of diluted swine waste. The approach (1) incorporates anaerobic digestion with an anaerobic sequencing batch reactor (ASBR) to stabilize waste, reduce odor, and reduce solids and organic compounds, while producing biogas; (2) increases the ortho-phosphate concentration of the anaerobic digester effluent by enhanced biological phosphorus removal...