Algal bacterial granular sludge(ABGS)was cultivated by adding exogenous algae liquid(Chlorella)and flocculant(cationic polyacrylamide)into a light sequencing batch reactor using aerobic granular sludge(AGS)as carrier,and applied for inorganic high ammonia nitrogen wastewater treatment.The denitrification performance of ABGS with no mechanical aeration was further analyzed.The results showed that,with the particle number and size continuously decreasing and the algae gradually enriching,the algae-bacteria symbiosis system was successfully constructed on the 42nd day,and mature ABGS was obtained on the 129th day.On day 145,the ABGS exhibited an average particle size and sludge concentration of 0.46 mm and 1750 mg/L,respectively,the sludge volume index of 51.43 mL/g,and the sludge chlorophyll a mass concentration of 17.48 mg/L,with the dominant bacterial genera being Blastopirellula(16.70%,relative abundance,the same below),SM1A02(12.91%),Nitrosomonas(7.78%),etc,and the dominant algae Chlorella(88.06%).The removal rates of ammonia nitrogen and total inorganic nitrogen(TIN)fluctuated greatly from the first day to 67th day and 105th to 131th day,and were close to 100%and 60%from 68th to 104th day and 132th to 145th day,respectively.The oxygen production rate of algae showed an overall decreasing trend,and remained at approximately 15 mg(O2)/(L·h)at the 100th day.The TIN removed by algal assimilation was between 15%and 100%.
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