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In this paper, a comparison with the ordinary SBR process was studied on the basis of nitrogen and phosphorus removal SBBR process synchronization performance . The results showed that when the process parameters which HRT was 6.5h ( influent 15min, aeration 300min, precipitation 65min, water 10min), aeration is 0.14m 3 · h -1 , pH value of 7.0 ~ 7.2, NH 4 -N and TP influent concentrations were 21.45 ~ 50.92mg · L -1 and 2.34 ~ 7.13mg · L -1 time , SBBR process on both removal rates of 70 to 85% and 70 ~ 98% , the effluent does not meet a basic class B emission standards (GB18918-2002). But SBBR process a cycle nitrogen and phosphorus removal processes are unconventional process, that process does not denitrification of nitrate accumulation, phosphorus during a period of no apparent phosphorus release phenomenon . In the study , based on the system through the dosing SBBR different concentrations of ferric chloride , ferric chloride was studied SBBR processes for wastewater removal NH 4 -N and TP effects and by examining NH 4 -N and TP concentrations within a cycle trends are discussed on the removal of ferric chloride in wastewater NH 4 -N and TP mode of action . The results show that the excess ferric chloride inhibit microbial activity , is not conducive to the removal of pollutants ; adding an appropriate amount of ferric chloride (i.e., the same day in the morning every cycle of operation , the aeration reactor 30min before the end of the cast plus a ferric chloride dosing concentration 3mgFeCl 3 · (L wastewater ) -1 ), can effectively improve the biofilm structure, improve the ability of microorganisms flocculation , NH < sub> 4 -N and TP removal efficiency reached a good effluent to meet emission standards a class A standard (GB18918-2002). In this paper, scanning electron microscopy , a preliminary study of the amount of ferric chloride dosing phase of biofilm
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