Geothermal to Harmonious with Environment

The process of developing and utilizing one geothermal field will pose enormous influence on the local geographic environment. Reports on many documents recorded the environment impact from the exploitation of geothermal field and research looking for economic treatment.

The air containing lower content of sulfureted hydrogen will produce uncomfortable odor smell. There are many removal processes to remove the sulfureted hydrogen contained on the non-condensed gases discharged from the geothermal liquid. It is mostly employed Stretford process to transfer H₂S to elemental sulfur product.

CO₂ , non-condensed gases also receives attention, which is not suitable to directly discharge into the air. The process of physical absorption and chemical absorption can remove the CO₂ and H₂S on non-condensed gases. The purified CO₂ (remove H₂S) can replace the purchasing of bottle-charged CO₂ so as to increase the indoor content of CO₂ and effectively stimulate the production increment of products in warm house.

Right now, most of the geothermal field reinject the treated wastewater (high content brine after separated and condensed water) into the underground heat reservoir, making the wastewater separate with the environment of the surface of the earth, preventing the surface vegetation, soil and water body from producing chemical pollution and heat pollution. The reinjection of wastewater can release the observed sedimentation and the increment phenomena of decline of variable water level. The increment of variable water level will create the water blending in diverse water level.

The integrated utilization associated with wastewater reinjection can mitigate the unfavorable impact on environment to the minimum level. In line with the enthalpy value and the temperature of the geothermal liquid, geothermal generation can be associated with heat supply, drying, warm house, shower and aquatic cultivation, which will allow the discharged waste heat lessen to the minimum. Utilizing H₂S on the waste gas can produce element sulfur or sulfuric acid, and produce purified CO₂. Valuable matters can be exacted from the wastewater. Finally the wastewater can return to the heat reservoir. The biological chemistry technology can be used to eliminate, thicken and recover the toxic matter and valuable mental among the geothermal wastewater, and make the residues into products with commercial benefits as well.

While the geothermal energy is applied to various productions, the discharging quantity on polluted matters and gases from warm house will be dramatically lower than that of combustion coal and petroleum. In this way, high-efficient treatment effect is easily to achieve. Therefore, to allow the geothermal energy replace other fossil fuels is one of important option to achieve the economic development in line with environment protection. In order to rapidly realize the industrialization in the developing country, requirement on energy continues increment in large extent; while the energy problems has been seriously puzzled by the environment concerns. To select the renewable energy like geothermal resources to replace the fossil fuels can release the trouble that the industrialized country had been occurred before.