Among those ecobiotechnology a new combined technique of high efficient bio-filter and constructed wet land is outstanding for its high performance,low power consumption,load fluctuant tolerance,stable running effect,and long life span,so it is very suitable to be used in rural towns at Pearl River Delta\'s.

Case study on the treatment of nitrogenous fertilizer industrial wastewater by the highly efficient biological aerated filter process;

Sewage treatment with the combination of an anaerobic fixed film reactor followed by a high rate trickling filter without re circulation was investigated.

The sewage treatments with the combination of an anaerobic fixed film reactor followed by a high rate trickling filter without re circulation and with the earthworm bio filter were investigated.