后置反硝化曝气生物滤池处理生活污水的研究

采用后置反硝化曝气生物滤池处理模拟生活污水,在保证出水COD达标排放的前提下,分别向二级缺氧滤柱中投加20 mg/L的甲醇和引入0.2Q(Q为试验中系统进水的流量)的原水作为外碳源,考察了投加外碳源对系统脱氮及去除COD的影响。试验结果表明,在二级缺氧滤柱中投加20 mg/L的甲醇作为外碳源时,系统出水的NH4+-N、TN、COD平均浓度分别为5.6、8、35.8 mg/L,其去除率分别为83.6%、81%、83.5%;在二级缺氧滤柱中引入0.2Q的原水作为外碳源时,系统出水的NH4+-N、TN、COD平均浓度分别为13.9、18.3、47.7 mg/L,去除率分别为59%、56.6%、78.1%。系统采用甲醇比引入原水作为外碳源的脱氮效果好且出水的COD浓度较低。

关于硝化曝气生物滤池参数化绘图的研究

本课题将硝化曝气生物滤池作为参数化设计的对象。通过对大量资料的调查,对硝化曝气生物滤池进行标准化处理,供设计者选用,把设计人员彻底的从繁重与重复的工作劳动中解脱出来。

DEHP降解菌对硝化型曝气生物滤池的影响

为探究邻苯二甲酸二(2-乙基己基)酯(DEHP)降解菌对硝化反应的影响及其去除DEHP的规律,采用两座下向流硝化型曝气生物滤池(BAF)进行对比试验。两座滤池进水DEHP浓度约为100μg/L,其中一座进水中投加能高效降解DEHP的菌液,另一座不投加该菌液作为空白对照。投菌量为V(菌液)∶V(污水)=1∶1000的滤池与不投加菌液的滤池进行30d的对比试验,结果发现投加菌液的滤池与不投加菌液的滤池,氨氮平均去除率均为96.98%,出水亚氮平均积累率分别为81.97%、93.02%,硝氮平均硝化率分别为18.03%、6.98%,DEHP的平均去除率分别为90.59%、88.10%。BAF运行过程中,DEHP降解菌的投加降低了BAF出水亚氮的积累,提高了DEHP的去除率,但对氨氮的去除没有产生影响。

提高同时硝化反硝化曝气生物滤池(NDN)硝化及单级生物脱氮效率的研究

温州市排水有限公司南片污水处理厂结合国内外单级生物脱氮及生物膜法单级生物脱氮的相关研究,2018年对厂内同时硝化反硝化曝气生物滤池(NDN池)进行工艺优化,提升回流比。比较分析2017年与2018年NDN池水质数据,数据表明提高该池回流比能有效提升该池硝化及单级生物脱氮效率。

电化学氧化及反硝化BAF联用深度处理焦化废水

针对焦化废水二级处理出水含难降解有毒有害有机物,且难以达标排放的问题,研究了BDD电极电化学氧化与反硝化曝气生物滤池联用深度处理焦化废水的效果。结果表明,当电化学氧化的水力停留时间控制在1 h,BAF的停留时间控制在12 h时,系统出水水质稳定,出水平均COD、NH_3^-N、NO_3^--N分别为62.9、2.60、9.9 mg/L,系统平均去除率分别为74.2%、83.6%、59.6%。

硝化型曝气生物滤池的挂膜与启动

近年来,曝气生物滤池广泛应用于污水硝化过程中,硝化型曝气生物滤池应运而生。采用快速排泥挂膜法和自然挂膜法相结合的复合挂膜法,考察了进水是否含有机物对硝化型曝气生物滤池挂膜的影响。在19℃、HRT=55 min、出水DO=8 mg/L、进水NH4+-N约为50 mg/L的条件下,两滤池挂膜启动时间差异较大,进水不含有机物的1#滤池挂膜成功仅需18 d,当其运行稳定时NH4+-N的去除率达到100%;而进水含有机物的2#滤池挂膜成功需24 d,当其运行稳定时,COD和NH4+-N去除率分别为84.6%和91.2%。此结果表明,与含有机物的实际生活污水相比,采用不含有机物的模拟生活污水启动硝化型曝气生物滤池挂膜启动时间可缩短6 d,这主要是由于异氧菌产率系数比硝化菌大。

前置反硝化曝气生物滤池中试启动研究

某污水处理厂采用曝气生物滤池(BAF)工艺,出水水质仅能达到国家二级排放标准,为使其达到国家一级A排放标准,拟采用前置反硝化BAF工艺进行升级改造,据此进行了中试启动研究。中试以污水厂实际进水为原水,处理规模为2 m3/d,采用自然挂膜方式,反硝化段和硝化段的体积比为1∶2,回流比为100%,各滤池的HRT均为0.67 h,CN池和N池的曝气量分别为0.82、1.0 m3/h。经过16 d的运行,出水COD、NH3-N和TN浓度分别稳定在50、5和15 mg/L以下,表明中试装置启动成功。

旅游景区污水处理改造工程实例

景区污水排放量增加且进水NH3-N含量过高,导致出水NH3-N严重超标。改造工程在充分利用原有构筑物的基础上,增加了曝气硝化池、污泥浓缩池和污泥回流系统,改造后出水水质达到《污水综合排放标准》(GB 8978—1996)新改扩一级标准。

Nitrogen Release Kinetics and Nitrification-Denitrification on Surface Sediments under Aerating Disturbance Condition

[Objective] This study aimed to investigate the nitrogen release kinetics and nitrification-denitrification on surface sediments under aerating disturbance condition, with the purpose to solve the sediment nitrogen release and secondary pollution problems. [Method] The effect of in situ sediments aeration on the release of nitrogen pollutants was investigated, and the nitrogen release kinetics parameters were analyzed. The process of nitrification and denitrification under sediments aeration condition was investigated in laboratory. [Result] The nitrogen released from sediments was enhanced by aeration disturbance. The concentration of NH4＋-N and TN reached the maximum value in 30 min, and release rates were proportional to the disturbance strength. In this study, with the distance of aerator to the sediments surface of 0, 1, 2 and 3 cm, the suspended sediments concentrations were 3.52, 3.41, 3.26 and 3.01 g/L, respectively. Maximum release concentration of NH4＋-N and TN were 14.3, 13.8, 13.2, 12.2 mg/L and 33.21, 30.98, 29.83, 27.30 mg/L, respec- tively. In addition, both NH4＋-N and TN release kinetics could be described by Double Constant Equation as InC=A＋Blnt. Nitrification reaction occurred and was promoted by continued aerating to sediments.The concentration of NH4＋-N dropped down from 12.4 mg/L to 0.2 mg/L in 8 d, with the concentration of NO3--N increased to the maximum value of 10.8 mg/L. In addition, concentration of NO3--N and TN decreased from 10.8 mg/L and 37.4 mg/L to 0.36 mg/L and 23.2 mg/L after the stop of aeration for 12 d, indicating the occurrence of denitdfication reaction. Therefore, sediment aeration could accelerate nitrogen release and nitrification reaction, and with intermittent aeration, nitrogen could be removed from sediments in-situ by nitrification and denitrification. [Conclusion] The results provided technical reference for the in situ sediment remediation for the black-odor rivers in cities.

Partial Nitrification from Domestic Wastewater by Aeration Control at Ambient Temperature

The objective of this paper was to examine the feasibility of partial nitrification from raw domestic wastewater at ambient temperature by aeration control only. Airflow rate was selected as the sole operational parameter. A 14L sequencing batch reactor was operated at 23℃ for 8 months, with an input of domestic wastewater. There was a prolgrammed decrease of the airflow rate to 28L·h^-1, the corresponding average dissolved oxygen （DO） was 0.32mg·h^-1, and the average nitrite accumulation rate increased to 92.4% in 3 weeks. Subsequently, further increase in the airflow rate to 48L·h^-1 did not destroy the partial nitrification to nitrite, with average DO of 0.60mg·h^-1 and nitrite accumulating rate of 95.6%. The results showed that limited airflow rate to cause oxygen deficiency in the reactor would eventually induce only nitrification to nitrite and not further to nitrate and that this system showed relatively stability at higher airflow rate independent of pH and temperature. About 50% of influent total nitrogen was eliminated coupling with partial nitrification, taking the advantage of low DO during the reaction.

Performance of simultaneous nitrification and denitrification in lateral flow biological aerated filter

A new wastewater treatment facility—lateral flow biological aerated filter (LBAF) was developed aiming at solving energy consumption and operational problems in wastewater treatment facilities in small towns. It has the function of nitrification and removing organic substrate. In this study, we focused on the denitrification performance of LBAF and its possible mechanism under thorough aeration. We identified the existence of simultaneous nitrification and denitrification (SND) by analyzing nitrogenous compounds along the flow path of LBAF and supportive microbial microscopy, and studied the effects of air/water ratio and hydraulic loading on the performance of nitrogen removal and on SND in LBAF to find out the optimal operation condition. It is found that for saving operation cost, aeration can be reduced to some degree that allows desirable removal efficiency of pollutants, and the optimal air/water ratio is 10:1. Hydraulic loading less than 0.43 m h?1 hardly affects the nitrification and denitrification performance; whereas higher hydraulic loading is unfavorable to both nitrification and denitrification, far more unfavorable to denitrification than to nitrification.

水解酸化/前置反硝化BAF工艺处理城市生活污水

大连市污水处理厂(二期工程)采用水解酸化/前置反硝化生物滤池处理工艺,对城市生活污水中COD、TN、氨氮、SS的去除率分别达到83.9%、61.84%、90.65%和92.3%。由于采用化学加药除磷和紫外线消毒的工艺,出水水质全面达到《城镇污水处理厂污染物排放标准》(GB18918—2002)的一级A标准。

A^2O-BAF工艺处理低C/N值生活污水的快速启动

以低碳氮比的实际生活污水为处理对象,重点研究了A2O-BAF工艺的快速启动。结果表明,先单独对硝化型曝气生物滤池进行挂膜后再将A2O与BAF连接起来可成功启动该双污泥系统。采用快速排泥挂膜法和自然挂膜法相结合的复合挂膜法,使用不含有机物的配水对曝气生物滤池进行挂膜,18d后曝气生物滤池挂膜成功。系统连续运行44d后达到稳定。使用碳氮比为3.21的生活污水进行驯化,反硝化除磷菌占聚磷菌的比例为66.7%,缺氧吸磷为系统的主要除磷方式,此时出水氨氮、正磷酸盐浓度均接近于零,出水硝态氮为15.1mg/L左右,对COD、氨氮、总磷和总氮的去除率分别为82%、100%、100%和67%。表明该双污泥系统运行效果稳定,启动成功。