考虑到时间问题，需要创建一个子系统，该子系统能够处理这些长时运行任务，向用户显示处理进度，并编制需要采取的后续步骤。

Because of the time involved, a sub-system needed to be created that could handle these long running tasks, keep the user informed of progress, and choreograph the next steps that needed to be taken.

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因此在选择污水及污泥处理工艺时，应当考虑对后续工艺及最终处置的影响。

When treatment technique for sewage and sludge is selected, the factors of follow-up processing and final treatment should be considered.

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