Nitrogen and Phosphorous Removal in Municipal Wastewater Treatment Plants in China: A Review

Table 1

Capacities of WWTP processes in geographic zones of China in 2006^a.

	North	East	Northeast	Middle	South	Southwest	Northwest
OD	110	280	0	140	40	60	50
SBR	30	120	70	10	50	80	30
AAO	220	370	10	20	120	60	20
AO	120	290	120	110	40	60	1
CAS^b	60	110	50	50	130	10	10

^aStatistic data covers 75% of the total WWTPs, and the data are approx. total capacities for each process. Capacity is in the unit of 10,000 tons/day; ^bConventional activated sludge processes including primary treatment processes.