TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Method: The pressure for squeezing and dehydrating in the steps (ii) and (iii) is controlled between 1-1.5 MPa. The wastewater processing in the step (iv) comprises acidity adjustment, an anaerobic process, an aeration process and a denitration process. The acidity adjustment comprises adding the wastewater into an acidity adjustment tank, introducing an active sludge at the bottom of the tank, arranging an air pipe having an air hole above the active sludge, and connecting the air pipe to an external air pump, which blows air to the air pipe, such that the air is injected from the air hole of the air pipe to turn over the sludge. The anaerobic process comprises feeding the sludge with adjusted acidity to the an anaerobic tank, which is provided with padding at the bottom, adding an anaerobic bacteria in the padding, and feeding the waste water from a lower part and flowing out from an upper part, where the padding is active carbon or the active sludge. The aeration process comprises feeding the anaerobically processed sludge in an aeration tank, mounting an aeration head at the bottom of the aeration tank, filling the active sludge in the tank, and mounting the aeration head below the active sludge, such that the aeration head inflates from the bottom of the tank to turn over the active sludge and the wastewater. The denitration process comprises feeding the aerated sludge into a denitration reactor, arranging an inflating pipe at the bottom of the denitration reactor and introducing color-glazed balls in the reactor, and impregnating the color-glazed balls in the wastewater, such that the inflating pipe blows from the bottom of the reactor to turn over the color-glazed balls and the sludge. Preferred Components: In the step (iii), raw materials for preparing the organic feed comprises (in parts by wt.) the rotten vegetable leaves fragments (25-35), lignite (25-35), the chick faeces (30-40), the tobacco powder (5-10) and zymocyte (0.1-0.2). In the step (iv), when the sludge is used as the additive, then the organic feed comprises (in parts by wt.) the rotten vegetable leaves fragments and the sludge (respectively 25-35), lignite (25-35), the chick faeces (30-40), the tobacco powder (5-10) and biological bacteria (0.1-0.2).