地下水处理系统通常包括预处理、主要处理和后处理三个阶段。在选择处理工艺时，应考虑以下因素：
The groundwater treatment system usually includes three stages: pre-treatment, main treatment, and post-treatment. When choosing a processing technique, the following factors should be considered:
处理效率：选择能够高效去除目标污染物的处理工艺，确保处理后的水质符合要求。
Processing efficiency: Choose a treatment process that can efficiently remove target pollutants to ensure that the treated water quality meets the requirements.
运行成本：综合考虑设备的购置成本、运行成本以及维护成本，选择经济合理的处理工艺。
Operating costs: Taking into account the purchase cost, operating cost, and maintenance cost of the equipment, select an economically reasonable processing technology.
技术成熟度：选择技术成熟、运行稳定的处理工艺，以降低故障率和运行风险。
Technological maturity: Choose processing technologies that are mature and stable in operation to reduce failure rates and operational risks.
环保要求：确保所选工艺符合当地的环保法规和标准，避免对环境造成二次污染。
Environmental requirements: Ensure that the selected process complies with local environmental regulations and standards, and avoids causing secondary pollution to the environment.