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Method for restoring groundwater nitrate pollution

A groundwater and nitrate technology, applied in the field of water treatment, can solve the problems of secondary pollution, low impact load resistance, complex process, etc., and achieve the effects of stable effluent index, no secondary pollution, and low technical cost.

Active Publication Date: 2013-12-25
SHENZHEN HONGKONG INSTITUTION OF IND EDUCATION & RES ENVIRONMENTAL ENG TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the cost of the physical method is too high, it is not selective, and only the transfer or concentration of nitrate pollutants has occurred, but it has not been completely removed in fact, so the method is subject to certain restrictions in application; biological denitrification Although the method can completely reduce nitrate to nitrogen, there are still some insurmountable shortcomings, such as low impact load resistance, secondary pollution, complicated process, and not suitable for small-scale and decentralized water supply treatment, etc.

Method used

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  • Method for restoring groundwater nitrate pollution
  • Method for restoring groundwater nitrate pollution

Examples

Experimental program
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Effect test

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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Abstract

The invention discloses a method for restoring groundwater nitrate pollution, which comprises the following steps: (1) throwing a modified natural slow release carbon source into groundwater polluted by nitrate; (2) supplementing denitrifying bacteria enriched liquid to the groundwater with carbon source thrown in the step (1) to carry out denitrifying treatment on the groundwater. The restoring method disclosed by the invention is low in technical cost, good in nitrate nitrogen removal effect, stable in water discharge index and is simple and free of secondary pollution.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for repairing groundwater nitrate pollution. Background technique [0002] In recent years, the discharge of industrial and domestic sewage has been increasing day by day, the rapid development of livestock and poultry breeding, and the increasing application of nitrogen fertilizers in agricultural production have disrupted the natural cycle of nitrogen. The pollution of groundwater by nitrate has become more and more serious. At present, groundwater used as drinking water sources in most areas of my country has been polluted by nitrates to varying degrees, and there is a trend of increasing year by year, and the concentration in some areas has exceeded 100mg / L. [0003] Excessive intake of nitrates has many hazards to human health, can cause methemoglobinemia, and can lead to hypoxia death in severe cases. The amine nitrite formed during the conversion of nitr...

Claims

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Application Information

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IPC IPC(8): C02F3/34
Inventor 杨小毛王波李旭宁刘欢肖海云黄鑫梅峰裴廷权赵振业
Owner SHENZHEN HONGKONG INSTITUTION OF IND EDUCATION & RES ENVIRONMENTAL ENG TECH CO LTD
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