| The artificial soil rapid infiltration is one of the best way for wastewater removal, but it still has some limits: one aspect is that water quality of output is close or excel the secondary level discharge standard of secondary biological treatment plant, but it is still needing to meet with higher level, especially removal efficiency to TN (30%~40%) is not good enough; Another aspect is that nutrient in output water is leanness for plant's irrigation.Our study has two task: one is test that output water from the bed in different granularity and different height to meet irrigation standard; the other is intensify the ASRI-bed's function, especially advance removal efficiency of TN.The results show that: in the test for the first aim, output water of bed (the granularity 0.25mm~0.5mm) whose height is between 45cm to 60cm can meet inigation for dry farming and paddy field. If the bed is higher, output water will close or meet with standard for vegetable's irrigation. Output water of the granularity (0.10mm~0.25mm) is good for irrigation, but the Kt is not big enough only if the bed height between 40cm~45cm. Output water from the bed of other granularity in different height is not so good, but it can be pretreatment for other establishment for the Kt is high.When cinder is added in the ASRI-bed, its Kt is evidently advanced, so do be the removal efficiency, and its cost is the lowest. 7% should be the fittest amount of cinder added, the efficiency of waste water removal is the best, and the removal efficiency to TN is advanced 18.9%. Removal efficiency of bed added with other padding is also advanced, but their Kt is lowered, and their cost is higher than the bed added with cinder.When the ASRI-bed added with 7% cinder is further intensified in different way, the ASRI-bed's function advanced further, the best removal efficiency to TN belongs to synthesis treatment: 82.65%; plant treatment, the second: 81.64%; when synthesis-benefit analyzed, plant treatment is the best selection. |
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