A method for remediating groundwater nitrate pollution
A groundwater and nitrate technology, applied in the field of water treatment, can solve problems such as secondary pollution, low impact load resistance, complex process, etc., and achieve the effects of stable water output, no secondary pollution, and low technical cost
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Embodiment 1
[0036] Example 1: Taking groundwater in a northern plain area where nitrogen fertilizers were excessively used as an example, nitrate pollution was remediated.
[0037] use as figure 1 The denitrification percolation system shown is composed of a water distribution tank 10, an inlet pump 11, a denitrification filter tank 20, a sump 30 and a flushing water pump 31, wherein the anti-seepage membrane is an HDPE anti-seepage membrane with a thickness of 2.0mm, supporting The layer 22 is filled with pebbles, the particle size is 30-50mm, the height of the supporting layer 22 is 0.5m, the height of the filler layer 23 is 1.0m, and the filler is 2-3mm natural river sand, the surface hydraulic load of the denitrification filter 4m 3 / m 2 · d, the hydraulic retention time is 4h.
[0038] The specific method is:
[0039] (1) Add the old rice through modification in the water distribution tank 10, and the dosage is added according to the carbon-to-nitrogen ratio of 3: 1. The modifica...
Embodiment 2
[0042] Example 2: Remediation of groundwater in farmland areas with severe nitrate pollution
[0043] use as figure 1 The denitrification percolation system shown is composed of a water distribution tank 10, an inlet pump 11, a denitrification filter tank 20, a sump tank 30 and a flushing water pump 31, wherein the anti-seepage membrane is an HDPE anti-seepage membrane with a thickness of 2.5mm, supporting The layer 22 is filled with gravel, the particle size is 30-50mm, the height of the support layer 22 is 0.3m, the height of the packing layer 23 is 1.5m, and the filler is fine ceramsite of 3-5mm. The surface hydraulic load of the denitrification filter 4m 3 / m 2 · d, the hydraulic retention time is 6h.
[0044] The specific method is:
[0045] (1) Add the modified wheat in the water distribution tank 10, and the dosage is added according to the carbon-nitrogen ratio of 5: 1. The modified method is to grind the wheat into fine particles below 2mm, and then swell the whea...
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