Abstract
A rural domestic sewage treatment technology with low transportation and low energy consumption to be used in rural areas in the alpine and arid regions of northwest China is discussed. In addition, a three-stage integrated anaerobic biophysical coupling treatment technology was studied, the optimal process parameters were determined, and an operating treatment device was developed. Experimental results show that the effluent water met the Farmland Irrigation Water Quality Standard (GB 5084-2021) for green-ing irrigation and realizing comprehensive water resource utilization. The hydraulic retention time was 48 h, the influent temperature was greater than 10 ℃, the pH was between 6 and 9, and the salt concentration was between 600 and 2700 mg/L. Under these conditions, the CODCr, SS, TP, and NH3–N removal rates of the three-stage in-tegrated anaerobic biophysical coupling treatment technology were 69.41%, 82.61%, 14. 16%, and 12.99%, respectively. On the basis of the integrated development of the three-stage integrated anaerobic biophysical coupling treatment technology, the inte-grated device has a processing capacity of 0.50 m³/d and the CODCr, SS, TP, and NH3–N removal rates were 72.96%, 85.97%, 12.33%, and 12.58%, respectively. The demonstration application uses an integrated device with a processing capacity of 3.60 m³/d. The CODCr, BOD5, SS, TP, and NH3–N removal rates were 69.88%, 48.89%, 82.48%, 14.07%, and 38.34%, respectively.
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