"It is understood that so far, Xiamen city *** there are 8 sewage treatment plants, each district of the city has built a sewage treatment plant and put into operation."
Accordingly, Xiamen has 8 sewage plants:
Qianpu Sewage Plant
Xinglin
Shi Weitou
Tong'an
Yundang
Haicang
Jimei
Xiang'an
But that's searching out, it doesn't keep all right.