Groundwater bio-rehabilitation engineering technology.

Because of the water phase as the main treatment medium, pollutants, microorganisms, dissolved oxygen and nutrients are transmitted quickly, and avoid complex and adverse changes in the natural environment, various environmental conditions (e.g. pH, temperature, redox potential, oxygen volume, nutrient concentration, salinity, etc.) are easy to control in the best condition, so the reactor processing of pollutants significantly faster, but its engineering is complex, high treatment costs.
, care must be taken in the treatment of biodegradable substances to prevent the transfer of pollutants from the soil to the water.
of groundwater biometric engineering can be divided into three categories: 1, in-place treatment and soil basically the same, as described above.
2. Physical blocking The use of temporary physical barriers to slow and block the further movement of pollutants in groundwater has been successful in some sites contaminated with toxic and harmful pollutants.
3, above-ground treatment, also known as extraction-treatment technology, is the extraction of contaminated groundwater from the groundwater layer, and then on the ground with one or more processes (including vapor extraction to remove volatile substances, activated carbon adsorption, ultrafiltration ozone/ultraviolet oxidation or ozone/hydrogen oxidation, activated sludge and biofilm reactors, etc.), and then water into the formation.
But in practice it is difficult to extract pollutants that are adsorbed to the substation of the groundwater layer, so this method is less efficient and is only a measure to prevent the further spread of pollutants in the groundwater layer.
, for example, in a biofilm reactor, sand is used as a carrier to fix the biofilm and methane or natural gas is the initial substitin, removing more than 60% of PCBs.
When carrying out the bio-repair treatment of groundwater, attention should be paid to investigating whether the hydrogeological parameters of the area allow groundwater to be extracted from the ground and the treated groundwater to be re-filled, the depth and extent of the groundwater layer, the permeability and direction of groundwater flow, and to determine whether the water quality parameters of groundwater such as pH, dissolved oxygen, nutrients, alkalinity, and water temperature are suitable for the use of bio-repair techniques.
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