Carbon source carrier filler for repairing nitrate pollution of underground water

Abstract

The invention provides a carbon source carrier filler for repairing nitrate pollution of underground water. The carbon source carrier filler is formed by cladding biological ceramsite surface with an organic carbon source coating. The coating of the carbon source carrier filler comprises the following main components of: by weight, 10-50% of a natural carbon source material powder, 10-20% of a solvent, 1-5% of trace element, 10% of animal glue, 0-5% of a deoxidant, 0-5% of a pH conditioning agent and 0-2% of a surfactant. The carbon source carrier filler prepared in the invention has good mechanical properties and biological endophilicity, can achieve the aim of long-acting sustained release of carbon source, is suitable for underground water in-situ and ex-situ remediation technologies, and can be used to effectively avoid the secondary pollution problem of additional carbon sources.

Description

technical field [0001] The invention relates to a carbon source carrier filler for nitrate pollution restoration of groundwater, belonging to the technical field of groundwater pollution restoration. Background technique [0002] 68% of the fresh water sources suitable for drinking on the earth are groundwater, and about 50% of the world's population uses groundwater as their drinking water source. However, whether in industrially developed countries or developing countries, due to the discharge and leakage of domestic sewage and industrial wastewater, the application of a large number of chemical fertilizers and pesticides in rural areas, the leaching and infiltration of fecal garbage and solid waste, atmospheric nitrogen oxides Wet and dry deposition, as well as unreasonable recharge of sewage, etc., lead to an upward trend in the concentration of nitrate nitrogen in groundwater, and become an important environmental problem. [0003] Previously, the remediation methods f...

AI Technical Summary

Problems solved by technology

Although there are many technologies, these methods have their own limitations in practical application: physical and chemical treatment cannot convert nitrate into harmless substances, there is secondary pollution, and the efficiency is low, the selectivity is poor, the investment is high, and the operating cost is high. Suitable for large-area groundwater nitrate pollution remediation

[0004] From the two aspects of completely eliminating nitrate pollution in groundwater and reducing the cost of denitrification, biological denitrification method is the most economical and effective method that has been put into use at present. carbon source, and the dissolved oxygen contained in the water makes it difficult for the groundwater environment to reach anaerobic conditions; if an external carbon source is added, the effluent often contains biological solids and dissolved organic matter

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