[Sodium hypochlorite disinfection on effluent of MBR in municipal wastewater treatment process].

Sodium hypochlorite (NaClO) used in wastewater disinfection was assessed by examining its performances in lab fed by the effluent from a MBR treatment plant. The influence of sodium hypochlorite initial concentrations (0.5-3.

[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.

[Application of GFH in the municipal effluent reuse for landscape].

In order to prevent increased algae growth for the reuse of reclaimed water as landscape water, the removal mechanism of phosphate, DOM and nitrogen by adsorption onto GFH was studied. The result showed that the removal rate of phosphate was the highest, when the influent concentration of TP was 0.059-0.

[Research on the organic biodegradability of secondary effluent treated by ozonation].

The secondary effluent of three WWTPs was treated by ozonation to investigate organic biodegradability enhancement. The bulk experimental method was used. Ozone adding dosage was controlled to be 2, 4, 6, 8, 10 mg/L by adjusting the adding time.

[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.

[Half-nitrosofication of dewatering liquid of digested sludge with high ammonia].

The affecting factors and controlling methods of how realizing and maintaining half-nitrosofication of dewatering liquid of digested sludge were investigated in an A/O process. The experimental results showed that the nitritation was obtained in 29 d under bulk liquid temperature of 9-20 degrees C, average DO of 5.4 mg/L, SRT of about 30 d and influent ammonia loading rate of 0.

[Start up and maintain of nitritation by the inhibition of FA and FNA].

In order to treat the digested sludge dewatering liquor bypass and reduce influent ALR of wastewater treatment plant, the startup and maintenance of nitritation was investigated in an A/O reactor. NOB activity was inhibited and nitritation was stated up successfully by increasing the influent ALR (in N, the same below) step by step from 0.23 kg/(m3 x d) to 0.