CN114904385A - 一种亲水性VOCs对废气中疏水性VOCs的生物强化去除调控方法 - Google Patents
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Abstract
本发明公开了一种亲水性VOCs对废气中疏水性正己烷的生物强化去除调控方法。本方法采用污水处理厂氧化沟内活性污泥对生物滴滤器进行接种,以低浓度疏水性VOCs和亲水性VOCs同时对填料上微生物进行驯化,驯化成功后调控进口亲水性VOCs和疏水性VOCs浓度,监测填料生物膜浓度和正己烷去除率,根据正己烷去除效率变化调节亲水性VOCs在反应器中的浓度,利用亲水性VOCs对生物膜生长的促进作用强化生物滴滤器对疏水性VOCs的去除。本发明抗冲击负荷强,通过调控废气中亲水性VOCs浓度,可以增强生物滴滤器对废气中疏水性VOCs的去除性能,同时自身还能被微生物降解,达到了达到“变废为宝”、“以废治废”的目的。
Description
技术领域
本发明属于废气资源化利用和废气生物过滤技术领域,特别涉及一种亲水性VOCs对废气中疏水性VOCs的生物强化去除调控方法。
背景技术
目前,挥发性有机物(VOCs)的污染越来越受到人们的重视。来自工农业生产过程或市政设施的VOCs排入环境中,会引起区域大气污染问题(VOCs作为前驱物会加重细颗粒物或臭氧污染)和人体健康问题。
在众多VOCs控制技术中,生物法利用微生物吸附并降解VOCs,将其转化成小分子的二氧化碳、水和微生物菌体,具有处理效果好,投资运行成本低、二次污染小等突出优点。但是,由于疏水性的VOCs的水溶性较低,气液传质阻力较大,导致疏水性VOCs在生物过滤过程中难以获得较高的去除能力。因此,增强疏水性的VOCs在液相中的生物可利用性是改善生物反应器性能必不可少的条件。亲水性化合物如酮、醛、脂类等因具有较高的水溶性和较低的亨利常数(0.0001-0.099)因此很容易被微生物降解。这类有机化合物能促进生物膜的生长,在较短的时间内使微生物在填料表面蓄积,导致反应器压降增加,最后使反应器性能恶化。但是这类化合物的有机废气在生物反应器中的处理效率较高。此外,大多数亲水性的有机物能溶解疏水性的VOCs,如正己烷可以溶解在丙酮、醇类物质中,蒎烯可以溶于乙醇等。因此,亲水性有机物的添加可能会促进疏水性VOCs的生物可利用性,从而改善生物反应器对疏水性VOCs的去除。采用废气中的亲水性VOCs,基于它的共代谢作用及对疏水性VOCs的溶解性来提高疏水性VOCs的生物可利用性,以期实现废气中亲水性VOCs促进生物滴滤器对疏水性VOCs的去除,达到“变废为宝”、“以废治废”的目的。
发明内容
一种亲水性VOCs对废气中疏水性VOCs的生物强化去除调控方法,其特征在于具体步骤为:
(1)在填料填装至生物滴滤器之前将填料浸泡在活性污泥中,使微生物附着在填料上,然后将填料置于生物滴滤器中,通入低浓度亲水性VOCs和疏水性VOCs,调节营养液喷淋量3.84~5.76L/d,每隔3min喷4s,气体停留时间为10~30s,对填料上的微生物进行驯化;
(2)驯化阶段结束后,调节亲水性VOCs和疏水性VOCs浓度到一定的范围。
(3)通过U型压力计实时监测填料压降变化,根据填料压降或疏水性VOCs去除率变化调控亲水性VOCs浓度。
本发明步骤(1)中所述的亲水性VOCs为丙酮,疏水性VOCs为正己烷,亲水性VOCs浓度150~250mg/m3,疏水性VOCs浓度150~250mg/m3。
本发明步骤(2)中所述的亲水性VOCs浓度调控范围在0~1000mg/m3,疏水性VOCs浓度范围在100~600mg/m3。
本发明步骤(3)中所述的根据填料压降变化调控亲水性VOCs浓度为填料压降高于70Pa,浓度为100~350mg/m3疏水性VOCs去除率低于80%时,清洗填料微生物后仅通入100~250 mg/m3疏水性VOCs,4-8天正己烷去除率仍低于80%时,再引入浓度范围为100~250mg/m3亲水性VOCs。
本发明步骤(3)中所述的疏水性VOCs去除率变化调控亲水性VOCs浓度为当混合气体中疏水性VOCs浓度为150~600mg/m3疏水性VOCs去除率低于55%时,关闭生物滴滤器,停止供应有机废气、氧气和营养液12-48h,再次启动生物滴滤器,亲水性VOCs和疏水性VOCs浓度均控制在150~200mg/m3。
本发明的优点在于:本发明抗冲击负荷强,通过调控废气中亲水性VOCs浓度,可以增强生物滴滤器对废气中疏水性VOCs的去除性能,同时自身还能被微生物降解,达到了达到“变废为宝”、“以废治废”的目的。
附图说明
图1为生物滴滤器启动阶段图。
具体实施方式
实施例1生物滴滤器启动,具体步骤如下:
(1)将从桂林市七星区七里店污水处理厂氧化沟内取的新鲜活性污泥过筛,滤去大颗粒状的固体物质后置于桶内,然后将填料浸泡在污泥中24-36h。期间每隔4h左右搅动一次填料,待微生物附着在填料上后取出置于生物滴滤器内。
(2)将平均进口浓度均为200mg/m3的正己烷气体和丙酮气体通入生物滴滤器,停留时间为30s,营养液的喷淋量为4.5L/d,喷淋周期为3min喷4s,每天采用气相色谱测定出口正己烷和丙酮的浓度。结果如图1所示,经过17天左右的驯化,正己烷的去除率一直稳定在 90%左右,丙酮的去除率也逐渐增加,到第5天,其去除率达到100%且在随后的反应期内一直稳定在100%左右。装置内压降稳定,因此说明装置启动成功,驯化阶段结束。
实施例2亲水性丙酮对疏水性正己烷去的强化处理效果。
驯化阶段结束后,调节废气中正己烷和丙酮浓度,采用U型压差计监测填料上微生物蓄积程度,每天用气相色谱测定出口有机物浓度。保持空床停留时间不变,正己烷进口浓度为 200mg m-3,丙酮进口浓度为500~800mg m-3,反应器运行10天,正己烷去除率为40%~50%左右,丙酮去除率仍保持在85%~100%,在此阶段关停生物滴虑系统,停止供应有机物、氧气和营养液,12h后再次启动生物滴虑系统,同时供应浓度为200mg m-3正己烷和丙酮,生物滴虑系统运行8天后正己烷的去除性能又恢复到85%以上,丙酮的去除率仍能保持在 100%。
通过上述实施例可以看出,低浓度的丙酮有利于提高正己烷的去除性能以及反应器性能的快速恢复,且能长时间运行。
Claims (5)
1.一种亲水性VOCs对废气中疏水性VOCs的生物强化去除调控方法,其特征在于,包括以下步骤:
(1)在填料填装至生物滴滤器之前将填料浸泡在活性污泥中,使微生物附着在填料上,然后将填料置于生物滴滤器中,通入低浓度亲水性和疏水性VOCs,调节营养液喷淋量3.84~5.76L/d,每隔3min喷4s,气体停留时间为10~30s,对填料上的微生物进行驯化;
(2)驯化阶段结束后,调节亲水性VOCs和疏水性VOCs浓度到一定的范围;通过U型压力计实时监测填料压降并根据疏水性VOCs去除率变化调控亲水性VOCs浓度。
2.根据权利要求1所述的一种亲水性VOCs对废气中疏水性VOCs的生物强化去除调控方法,其特征是步骤(1)中所述的亲水性VOCs为丙酮,疏水性VOCs为正己烷,亲水性VOCs浓度150~250mg/m3,疏水性VOCs浓度150~250mg/m3。
3.根据权利要求1所述的一种亲水性VOCs对废气中疏水性VOCs的生物强化去除调控方法,其特征是步骤(2)中所述的亲水性VOCs浓度变化范围在0~1000mg/m3之间,疏水性VOCs浓度范围在100~600mg/m3。
4.根据权利要求1所述的一种亲水性VOCs对废气中疏水性VOCs的生物强化去除调控方法,其特征是步骤(3)中所述的疏水性VOCs去除率调控亲水性VOCs浓度为浓度为100~350mg/m3疏水性VOCs去除率低于80%时,清洗填料微生物后仅通入100~250mg/m3疏水性VOCs驯化4-7天,当其去除率仍低于80%时,再引入浓度范围为100~250mg/m3亲水性VOCs。
5.根据权利要求1所述的一种亲水性VOCs对废气中疏水性VOCs的生物强化去除调控方法,其特征是步骤(3)中所述的疏水性VOCs去除率变化调控亲水性VOCs浓度为当混合气体中疏水性VOCs浓度为150~600mg/m3的去除率低于55%时,关闭生物滴滤系统,停止供应正己烷、丙酮、氧气和营养液12-48h,再次启动生物滴滤系统,亲水性VOCs和疏水性VOCs浓度均控制在150~200mg/m3。
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