Geotrichum capitatum, a new isolate degrading phenol

<i>Geotrichum capitatum</i> strain GID2, highly active in degradation of phenol was isolated from the biocenosis of rotating discs reactor treating petrochemical wastes. It was also able to utilize ethanol, glycerol, acetate, citrate and p-, m-cresoles as sole C-sources.

Application of an anaerobic hybrid reactor for petrochemical effluent treatment

An anaerobic hybrid reactor (UASB/Filter) was used for petrochemical wastewater treatment in mesophilic conditions. The seeded flocculent sludge from a UASB plant treating dairy wastewater, acclimatized to the petrochemical wastes in a two-stage operation. After start up, under steady-state conditions, experiments were conducted at OLRs of between 0.5 and 24 kg TCOD m−3 d−1, hydraulic retention times (HRT) of 4–48 h and up-flow velocities 0.021–0.25 mh−1. Removal efficiencies in the range of 42–86% were achieved at feed TCOD concentrations of 1,000–4,000 mg L−1. The results of reactor performance at different operational conditions and its relations are presented and discussed in this paper. Then, the obtained data are used for determination of kinetic models. The results showed that a second-order model and a modified Stover–Kincannon model were the most appropriate models for this reactor. Finally, the biogas production data were used for the determination of biogas production kinetics.

An Explorement of Multi-Habitat Ecological Pond with Situ Water Purification Technology in Treating Nitrogen and Phosphorus from Petrochemical Wastewater

The objective is to explore degradation and removal of nitrogen and phosphorus in each unit of pond when using an artificially enhanced ecological system treats petrochemical wastes. The system consists of anoxic pond, the aerobic pond and aquatic plants pond, aiming to achieve a coordinate treatment effect in the multi-habitat system. The system combines treatment effects including assimilation, decomposition, interception, absorption, adsorption and filtration of microorganisms, aquatic plants and soil in the anaerobic, anoxic and aerobic state. It shows that the system has a good removal effect on COD, NH3-N, TN, and TP, and the removal rate range for each is 26.7% ~ 48.6%, 55.4% ~ 91.3%, 20.4% ~ 43.6% and 25.7% ~ 46.4%, respectively. It is also found that the treatment effects change with seasons, which are the best in summer because of vigorous plant growth and strong microbial activity. In conclusion, the system has a higher efficiency to remove nitrogen and phosphorus than the traditional stabilization pond technology.