[Transformation of phosphorus forms in the construction process of phosphate reduction system of hypersaline and high-phosphorus wastewater].

Transformation of phosphorus forms in the construction process of biological phosphate reduction system was discussed in treating saline and high-phosphorus pickled mustard tube wastewater to resolve problems encountered with present phosphorus removal technology. A phosphate reduction system under hypersaline condition (salinity, 7% , measured by NaCl) was successfully constructed, when the reactor was started with 3% salinity wastewater and the salinity was increased through two stages, at influent organic loading (COD) 0.45 kg x (m3 x d)(-1), phosphorus loading (PO4(3-)-P) 5.

[Simultaneous chracterization of RBCOD and SBCOD in wastewater by hybrid respirometer].

Respirometry was made using wastewater and activated sludge from a WWTP of Chongqing through self-developed hybrid respirometer. And complete oxygen uptake rate (OUR) curves containing OUR of biodegradation process of RBCOD and SBCOD and endogenous process were obtained. A new method based on respirometry was proposed to characterize RBCOD and SBCOD in wastewater simultaneously, in which hydrolysis model was selected to analyze OUR curves of SBCOD according to the two-phases nature of exogenous OUR and trend-test method for endogens OUR.

[Performance of biological phosphorus removal in anaerobic pre-fermentation and intermittent aerated biofilm system treating domestic wastewater].

A fixed-film system composed of anaerobic biofilter and intermittent aerated biofilter (IABF) was developed for enhanced biological phosphorus removal (EBPR) in treatment of domestic wastewater. Influence of hydraulic, organic, and phosphorus loading on performance of the system was investigated in this study. The result indicates that the system is efficient for the removal of organic and P in the treatment.

[Various effects on the activity of activated sludge by low intensity ultrasonic treatments with different parameter combinations].

Aerobic activated sludge was used as experimental material. Specific oxygen uptake rate (SOUR), mixed liquor suspended solids (MLSS), COD ratio and lambda (deltaMLSS/deltaCOD) were taken as experimental indexes to indicate the changes of sludge activity and metabolism. The influences on activated sludge induced by ultrasonic treatments with different parameter combinations were studied by equal-distribution experiments about frequency, ultrasound intensity and irradiation time.

[Study on determination of trace copper(II) by catalytic kinetic discoloring spectrophotometry].

A kinetic spectrophotometric method for the determination of trace Cu(II) was developed in this paper. This method is based on the discoloring oxidation reaction between malachite green and hydrogen peroxide catalyzed by copper(II) in the medium of HCl solution. The influential factors of reaction and the optimum conditions for the determination of Cu2+ were investigated in detail.

[Effects of Mn2+, Mo6+ and Zn2+ on the components change of extracellular polymeric substances in activated sludge].

By specific oxygen uptake rate, (SOUR) measurements of activated sludge with different metal ion concentration, the optimal stimulation concentrations of Mn2+, Mo6+ and Zn2+ were determined. Then within each metal ion stimulation concentration range, extracellular polymeric substances (EPS) were extracted from activated sludge and its components (protein, polysaccharide and nucleic acid) contents changes were investigated. The results showed that the optimal stimulation concentration of each metal ion is 1mg x L(-1).