Microbial electrochemical apparatus and method for restoring nitrate-polluted underground water

Abstract

The invention belongs to the field of environment protection, and especially relates to a microbial electrochemical apparatus and a method for in-situ restoring of nitrate-polluted underground water. The apparatus is composed of an electrode restoration system, an electrode control system, an electrode liquid circulating system and a temperature control/adjusting system; through the electrode control system, the electrode restoration system is capable of intermittently at a microbe electrolysis cell state (MEC), a microbe fuel cell state (MFC) and an open-circuit state; through the electrode liquid circulating system, an electrolyte is controlled to be circulated between a cathode chamber and an anode chamber and is continuously updated; and the temperature control/adjusting system is capable of controlling the temperature of the electrode in the two electrode chambers and promoting metabolism of microbes. The advantages comprise that by employing in-situ restoration for underground water, underground water does not need pumping out, the restoration efficiency is high, the energy utilization rate is high, secondary pollution does not exist, the restoration apparatus is strong in adaptability, the restoration apparatus and the restoration process are simple, and industrial production and operation are facilitated.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a microbial electrochemical device and method for in-situ restoration of groundwater nitrate pollution. technical background [0002] Groundwater is an important source of drinking water. At present, more than one-third of the Asian residents in the world use groundwater as the main water source. There are 310 cities in my country that exploit groundwater as the source of urban water supply. In many cities and villages in the arid-semi-arid north, groundwater is the only source of water. However, my country's groundwater sources are seriously polluted. The groundwater in most cities across the country is subject to a certain degree of point source and non-point source pollution, causing some elements to exceed the standard in some areas, and the pollution is on the rise. my country's drinking water safety. [0003] Nitrate itself is harmless to the human body,...

AI Technical Summary

Problems solved by technology

The autotrophic biological denitrification method does not need to add nutrients such as organic carbon sources to the water body, but the growth rate of the autotrophic biological denitrification microorganisms is slow, and the denitrification efficiency is low, and the cycle for repairing nitrate-contaminated groundwater is long; in order to To improve microbial denitrification, accelerate the degradation rate of nitrate ions, and shorten the repair period, it is necessary to add nutrients such as organic carbon sources to maintain a high degree of biological activity of heterotrophic biological denitrification microorganisms. secondary pollution problem

Images