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2021-08-25
城市污水厂废气处理中生物滤池的实际应用
城市污水处理厂在废气处理中运用生物滤池技术,不仅可以有效达到废气处理的目的,也可以实现生物资源的充分利用,最终实现经济效益与环境效益最大化的根本目标。同时,羿清环保重视对生物滤池的日常运维管理,确保在充分发挥其应有效用后获得更加理想的废气处理效果。
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城市污水厂废气处理中生物滤池的实际应用
Date﹕2021-08-25|Source:Eclear Environmental

城市污水厂废气处理生物滤池

生物滤池科学选型

在将生物滤池技术运用在城市污水处理厂废气处理中时,相关工作人员首先需要根据实际情况,合理选择与之相适应的生物滤池。目前,在废气处理中,常应用的生物滤池类型主要包括平面型、阶层式、集装箱式和塔式等。其中,阶层式生物滤池有多层生物滤池,虽然其可以有效避免占用过多土地资源并达到净化废气的效果,但其添加滤料的难度较大且成本费用较高。集装箱式生物滤池的占地面积较小并具有可移动的优势,其废气滤料表面负荷通常为50~500m3/(m2·h),但其同样存在滤料添加困难的局限。塔式生物滤池中,滤料高度可至少达到6m,工作人员可以直接从下方将滤料移出,再从上部重新加入经过增湿处理的新滤料,但其建设成本较高。经过综合考虑,本文认为,城市污水处理厂在运用生物滤池技术进行废气处理时,可选用平面型滤池。此类生物滤池中,废气滤料表面负荷通常为30~250m3/(m2·h),滤料平均高度介于0.5~1.5m,滤池最大面积可超过2000m2,其可以完成超过100000m3/h的废气处理任务。

2.2基本参数确认

通常,微生物细胞含水率介于75%~78%,考虑到微生物在生长繁殖过程中对水分有一定要求,因此城市污水处理厂使用生物滤池技术进行废气处理时,滤料上生物菌落含水率应至少达到40%,且废气中相对湿度需要大于95%。净化废气时,生物滤池的环境温度不得低于5℃,同时不得超过65℃。通过参考相关资料可知,碳、氮和硫等元素是构成微生物干细胞的主要元素,尤其是氮和磷元素更是净化废气必不可少的重要元素。因此,在使用生物滤池技术净化废气时,相关工作人员应当尽可能选择使用经过堆肥处理的牲畜粪便、火山岩和陶粒等作为生物滤料。将此类原料作为滤料,不仅可以保障滤料介质中含有充足的氮、磷元素,实现废气有效净化,也可以达到降低滤料制备与整体废气处理成本的目的。值得注意的是,在运用生物滤池技术净化废气时,三氢化硫、氨气以及其他含氯有机物在氧化分解的过程中将会使得废气处理环境pH逐渐减小,从而影响废气处理效果。因此,相关工作人员需要适时、适量、均匀地将pH缓冲剂喷涂在滤料上,从而实现对pH的有效调节,为成功净化污水处理厂废气创造良好条件。城市污水处理厂使用生物滤池技术进行废气处理时,本研究要求厂内废气中的化合物具有水溶性与可生物降解的特性,前期使用活性炭等吸附装置,完成对废气中的灰尘、油脂等杂质的初步处理,然后将生物滤池净化处理的单位废气量控制在10000m3/h以内。

城市污水处理厂在废气处理中运用生物滤池技术,不仅可以有效达到废气处理的目的,也可以实现生物资源的充分利用,实现经济效益与环境效益双赢的根本目标。同时,羿清环保重视对生物滤池的日常运维管理,确保在充分发挥其应有效用后获得更加理想的气处理效果。

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