Operational and structural A-stage improvements for high-rate carbon removal.

Biosorption of organics is investigated at two sites in order to optimize operation and infrastructure for carbon removal and redirection in upstream, high-rate processes. Sufficient process temperature and stable mixed liquor solids concentration were established as the key impact parameters for the process performance. Improved COD removal was achieved by either substantially enhanced aeration (elevated metabolic state) or by enhanced flocculation capability (dosed chemicals).

Performance of A-stage process treating combined municipal-industrial wastewater.

A biosorption column and a settling tank were operated for 6 months with combined municipal and industrial wastewaters (1 m/hr) to study the effect of dissolved oxygen (DO) levels and Fe dosage on removal efficiency of dissolved and suspended organics prior to biological treatment. High DO (>0.4 mg/L) were found to be detrimental for soluble chemical oxygen demand (COD) removals and iron dosing (up to 20 ppm) did not improve the overall performance.

Anammox treatment of high-salinity wastewater at ambient temperature.

The present study aims to provide a realistic understanding of how the anammox bacterial community and nitrogen removal performance are affected by increasing salt concentrations at ambient temperature. A laboratory-scale investigation was conducted for 92 days, during which the reactor was fed with synthetic inorganic wastewater composed mainly of NH(4)(+)-N and NO(2)(-)-N. A stable nitrogen removal rate of 4.

High-rate nitrogen removal by the anammox process at ambient temperature.

The purpose of this study is to investigate the nitrogen removal performance of the anaerobic ammonium oxidation (Anammox) process and the microbial community that enables the Anammox system to function well at ambient temperatures. A reactor with a novel spiral structure was used as the gas-solid separator. The reactor was fed with synthetic inorganic wastewater composed mainly of NH4+-N and NO2--N, and operated for 92 days.

High-rate nitrogen removal by the Anammox process with a sufficient inorganic carbon source.

This study focused on high-rate nitrogen removal by the anaerobic ammonium oxidation (Anammox) process with a sufficient inorganic carbon (IC) source. Experiments were carried out in an up-flow column Anammox reactor fed with synthetic inorganic wastewater for 110 days. The IC source was added into the influent tank in the form of bicarbonate.