[Stability of the CANON Process Based on Real-Time Control Technologies].

In order to achieve the optimization of the CANON process, ensuring the stability of water quality and increasing the removal rate of ammonia nitrogen, the stability of CANON process water quality under real-time control was studied in the SBR reactor. During the experiment, the temperature was controlled at 30℃±1℃ and the pH was 7-8, based on the corresponding relationship between indirect parameters and nitrogen pollutants, the real-time control strategy was formulated. The results showed that when the influent ammonia nitrogen concentration was 917-1540 mg·L, the residual ammonia nitrogen concentration of 6 mg·L can be used as the control parameter to meet the requirements of process stability but the ammonia nitrogen sensor had many problems such as high costs and large errors.

[Start-up of Granule CANON Process and the Strategy for Enhancing Total Nitrogen Removal Rate].

To shorten the start-up time of the CANON granular sludge process and improve the total nitrogen removal rate in the engineering, the start-up method of CANON granular sludge process and the strategy for enhancing the total nitrogen removal rate were studied in an SBR reactor. During the experiment, the temperature was controlled at 30℃±1℃ and the pH was 7-8, the aeration rate and settling time were operated according to the sludge properties and effect of nitrogen removal. The results showed that the transition of the sludge properties from combined floc-granule to granule was realized after 55 d.

[Start-up of Combined Floc-granule CANON Process and the Effects of SRT on Reactor Performance].

To shorten the start-up time of CANON process and guide the sludge dischargement in the practical project, the start-up of CANNON process and influence of different flocs SRT were studied by inoculation ANAMMOX granules of different proportions in two same specifications of SBR reactor. During the experiment, the temperature was controlled at 30℃±1℃ and pH was 7-8. The results showed that it was not good for CANON process rapid start-up when the two reactors were inoculated with 5% and 10% ANAMMOX granules respectively and the initial FA concentration exceeded 44 mg·L.

[Performance stability of CANON reactor and temperature impact].

In order to study long-term effect of completely autotrophic nitrogen removal over nitrite (CANON) reactor, performance stability was investigated by using synthetic inorganic ammonia-rich wastewater as raw water with a continuous flow CANON reactor. Both performances of short-cut nitrification and ANAMMOX were stable for more than one year. Under the condition that inner temperature at 35 degrees C +/- 1 degrees C, pH 7.

[Autotrophic nitrogen removal and enhanced biological phosphorus removal from municipal wastewater in a three-sludge system].

Using a three-sludge system consisted of anaerobic/oxic (A/O) process, partial nitritation and anaerobic ammonium oxidation (ANAMMOX) reactors, cost-effective removal of nitrogen and phosphate from municipal wastewater was achieved. The experimental results showed that effluent total phosphorus (TP) of the A/O system was less than 0.5 mg/L under hydraulic retention time (HRT) of 3.

[Partial nitrification of digested sludge liquor with low C/N and high-concentration ammonia].

The experimental system consisted of anoxic filter and aerobic suspended carrier biofilm reactor. The partial nitrification was achieved and maintained stably in the aerobic reactor under normal temperature (15-29 degrees C) and high DO (6-9 mg/L). The nitritation with 70%-80% nitrite accumulation efficiency was obtained when FA concentration was in the range of 1.

[Study of CANON process start-up under aerobic conditions].

The start-up of CANON process was studied to reveal adaptability and how to condense time of start-up with a lab-scale experiment. During start-up stage, temperature was controlled at 35 degrees C +/- 1 degrees C, pH was 7.39-8.

[Partial nitrification in SBR under normal temperature and limited oxygen condition].

Partial nitrification was researched in a SBR reactor under the limited oxygen condition (DO 0.3-0.4 mg/L) and the normal temperature of 14.

[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).