Tandem-type removing method for oxidative pollutants in shallow groundwater

Abstract

The invention relates to a tandem-type removing method for oxidative pollutants in shallow groundwater. The method is implemented by constructing three tandem restoration zones comprising a heterotrophy restoration zone, a combined restoration zone and a plant ecological purification and restoration zone. Firstly, modified smashed cotton stem, which is utilized as a heterotrophy biological membrane carrier and a solid sustained-release carbon source, and the like are utilized to perform denitrification treatment to reduce nitrates and generate carbon dioxide at the same time, thus providing an inorganic carbon source for subsequent autotrophy denitrification. Packing balls and a nanometer iron-composite-packing mixed bed generate hydrogen. By utilizing the carbon source generated above, and utilizing the hydrogen as an electron donor and utilizing a fiber membrane as a biological membrane carrier, the hydrogen is utilized by microorganism on the biological membrane surface, the nitrates are reduced into nitrogen, and high-valence heavy metals in the groundwater are reduced by the hydrogen, thereby achieving an objective of water purification. The method has advantages comprising hydrogen autotrophy denitrification without need of providing additional hydrogen or carbon dioxide, the high utilization rate of hydrogen, good treatment effects, no secondary pollution, etc. over the prior art.

Description

technical field [0001] The invention relates to a method for removing oxidative pollutants in shallow groundwater and improving the water quality of shallow groundwater, belonging to the technical field of groundwater restoration. Background technique [0002] Groundwater is an important part of water resources, maintaining nearly 70% of China's population drinking water and 40% of farmland irrigation. Due to the application of chemical fertilizers, sewage irrigation, garbage and excrement, industrial wastewater discharge, etc., under natural conditions, the discharge is leached and decomposed by precipitation to form pollutants such as nitrate and heavy metal ions, which flow into rivers and lakes and seep into the ground, resulting in groundwater pollution. Oxidative pollutants such as nitrates and heavy metals. About half of China's urban areas have serious groundwater pollution, and the quality of groundwater is declining. About 70 million people in the country are stil...

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Problems solved by technology

[0004] The present invention aims at the problems of serious oxidative pollutant pollution in existing shallow groundwater, complex operation of conventional treatment technology, high cost and easy secondary pollution, and provides a simple and convenient operation, good treatment effect and no secondary pollution. Removal of Oxidative Pollutants in Shallow Groundwater in Series

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