IC反应器接种不同污泥处理纤维板废水运行特性研究
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摘要
本研究通过IC反应器接种不同污泥处理纤维板废水的启动运行,分析了IC反应器在新领域的运行效果、运行参数及颗粒污泥特性。
接种污泥分别以城市污水处理厂的厌氧消化污泥和柠檬酸废水处理站厌氧颗粒污泥的1#、2#IC反应器启动过程中,采取不同的启动调试方案：1#IC反应器在进泥后先采用清水浸泡4-5d活化,再进2000mg/L低浓度废水,在反应器稳定运行一周左右,进水负荷在原基础上按20%稳步提高；2#IC反应器通过原水稀释厌氧颗粒污泥注入反应器,再采用出水闭路循环回流,强化罐体内泥水的混合效果,使产酸菌、产甲烷菌在最短时间内恢复活性,直至出水挥发酸(VFA)降低到400mg/L以下。然后以容积负荷为1.13 kgCODCr／(m3·d)进行启动,一段时间后,若出水VFA<400mg/L,pH>6.6, CODCr,去除率>80%,且产气量正常的条件下,进水负荷按阶段稳步提高1.70kgCODCr／(m3·d)。两反应器启动结束时,容积负荷可分别达到5.20kgCODCr／(m3·d)、7.30kgCODcr／(m3·d),CODCr,去除率均在85%以上。
在启动过程中通过对进出水CODCr、进出水pH值、出水VFA、进水温度及罐体温度研究发现：在进水负荷稳步提高的情况下,出水CODCr、在整体上没有呈现与进水CODCr正相关关系,出水CODCr略有变化,但都趋于稳定；在进水pH值波动的条件下,1#、2#IC反应器出水pH值分别稳定在7.0、7.1左右,且出水VFA更能准确快速地反应出IC反应器内部环境的变化,出水pH值变化明显滞后VFA变化。随着微生物活性的增强,进水负荷的提高,罐体温度与进水温度的差值逐渐增大,1#、2#IC反应器的最大温差分别为4.5℃、5.5℃。在进水温度稍微变化的条件下,进水温度与罐体温度的相对变化关系为不确定关系。
1#IC反应器在启动运行过程中,不断有污泥被洗出,这是污泥颗粒化进程中的正常现象。通过对洗出污泥和反应器内污泥VSS/SS的分析比较发现,洗出污泥VSS/SS在启动过程中先逐渐减小,且小于反应器内污泥的比值,在颗粒污泥出现期比值逐渐增大,其比值趋向于反应器内污泥VSS/SS值,且污泥整体沉降速率逐渐增大。2#IC反应器在启动过程中,虽有颗粒污泥被洗出,但其VSS/SS之比由0.803增加到0.838,微生物活性得到很大的提高。
In this study,the treatment of fibreboard wastewater by IC reactors inoculated different sludge during start-up,we can gain the results of IC reactors in the new field of operation,operating parameters and characteristics of granular sludge。
The inoculated sludge of 1# and 2# IC reactors being from the anaerobic digestion tank of a municipal wastewater treatment plant and anaerobic granular sludge of a citric acid wastewater treatment station respectively,the different start-up programs are taken。After the slude being pumped into 1#IC reactor,the water is used for 4-5d to activate sludge,then re-entering 2000mg/L low concentration waste water。After the reactor is taken stable operation about a week or so,influent load is improved by 20% steadily。The granular sludge is pumped into 2#IC reactor through the raw water diluting,and then in order to strengthen water-slude mixed effect,acidogenic bacteria,methanogenic bacteria in the shortest possible time to resume activity, effluent of the reactor is returned by closed-circuit cycle。The recycle is done until the VFA was less than 400mg/L,And then capacity load of influent flow of the raw water is 1.13kgCODCr/(m3·d)。During the reactor running for some time,if it is that the effluent VFA<400mg/L,pH>6.6,the removal rate of CODCr above 80%,and gas production being normal,the capacity load of influent flow is increased by 1.70kgCODCr/(m3-d) during every stage steadily。At the end of the two reactors Start-up,the maximum capacity loads are 5.20kgCODcr/(m3·d),7.30kgCODCr/(m3·d) respectively,and the removal rate of CODCr is more than 85%。
During the start-up,by researching the CODCr,pH of the influent and effluent, VFA of effluent,water temperature and tank temperature,we can conclude some results as following。Under the influent load steady improvement,it does not take on positive correlation between effluent CODCr and influent CODCr during start-up。But effluent CODCr take a slight change,and more stable。Although the influent pH value fluctuated,the effluent pH values of 1#and 2# IC reactors are about at 7.0,7.1 stably。And also the effluent VFA more accurately reflect the rapid response of the changes in internal environment of IC reactor。The change of effluent pH value has lagged far behind changes of VFA。As with the enhancement of microbial activity,influent load increased,tenmerature difference of influent temperature and tank temperature is increasing gradually。The maximum tenmerature differences of 1# and 2# IC reactors are 4.5℃and 5.5℃。little change of influent temperature conditions can lead to uncertain relationship of influent temperature and tank temperature。
The sludge are washed out constantly during 1# IC reactor start-up,which is a normal phenomenon of sludge granulation。By comparing VSS/SS values of washed out slude and the sludge in reactor,we can found that VSS/SS value of wash out sludge gradually reduce,which is less than the value of reactor。Once granular sludge formates,the VSS/SS value gradually increases into the value of the reactor,and also the whole sludge sedimentation rate increase gradually。Although the granular sludge was washed out during 2#IC reactor start-up,the VSS/SS value is increasing from 0.803 to 0.838。Moreover,the microbial activity has been greatly improved。
接种污泥分别以城市污水处理厂的厌氧消化污泥和柠檬酸废水处理站厌氧颗粒污泥的1#、2#IC反应器启动过程中,采取不同的启动调试方案：1#IC反应器在进泥后先采用清水浸泡4-5d活化,再进2000mg/L低浓度废水,在反应器稳定运行一周左右,进水负荷在原基础上按20%稳步提高；2#IC反应器通过原水稀释厌氧颗粒污泥注入反应器,再采用出水闭路循环回流,强化罐体内泥水的混合效果,使产酸菌、产甲烷菌在最短时间内恢复活性,直至出水挥发酸(VFA)降低到400mg/L以下。然后以容积负荷为1.13 kgCODCr／(m3·d)进行启动,一段时间后,若出水VFA<400mg/L,pH>6.6, CODCr,去除率>80%,且产气量正常的条件下,进水负荷按阶段稳步提高1.70kgCODCr／(m3·d)。两反应器启动结束时,容积负荷可分别达到5.20kgCODCr／(m3·d)、7.30kgCODcr／(m3·d),CODCr,去除率均在85%以上。
在启动过程中通过对进出水CODCr、进出水pH值、出水VFA、进水温度及罐体温度研究发现：在进水负荷稳步提高的情况下,出水CODCr、在整体上没有呈现与进水CODCr正相关关系,出水CODCr略有变化,但都趋于稳定；在进水pH值波动的条件下,1#、2#IC反应器出水pH值分别稳定在7.0、7.1左右,且出水VFA更能准确快速地反应出IC反应器内部环境的变化,出水pH值变化明显滞后VFA变化。随着微生物活性的增强,进水负荷的提高,罐体温度与进水温度的差值逐渐增大,1#、2#IC反应器的最大温差分别为4.5℃、5.5℃。在进水温度稍微变化的条件下,进水温度与罐体温度的相对变化关系为不确定关系。
1#IC反应器在启动运行过程中,不断有污泥被洗出,这是污泥颗粒化进程中的正常现象。通过对洗出污泥和反应器内污泥VSS/SS的分析比较发现,洗出污泥VSS/SS在启动过程中先逐渐减小,且小于反应器内污泥的比值,在颗粒污泥出现期比值逐渐增大,其比值趋向于反应器内污泥VSS/SS值,且污泥整体沉降速率逐渐增大。2#IC反应器在启动过程中,虽有颗粒污泥被洗出,但其VSS/SS之比由0.803增加到0.838,微生物活性得到很大的提高。
In this study,the treatment of fibreboard wastewater by IC reactors inoculated different sludge during start-up,we can gain the results of IC reactors in the new field of operation,operating parameters and characteristics of granular sludge。
The inoculated sludge of 1# and 2# IC reactors being from the anaerobic digestion tank of a municipal wastewater treatment plant and anaerobic granular sludge of a citric acid wastewater treatment station respectively,the different start-up programs are taken。After the slude being pumped into 1#IC reactor,the water is used for 4-5d to activate sludge,then re-entering 2000mg/L low concentration waste water。After the reactor is taken stable operation about a week or so,influent load is improved by 20% steadily。The granular sludge is pumped into 2#IC reactor through the raw water diluting,and then in order to strengthen water-slude mixed effect,acidogenic bacteria,methanogenic bacteria in the shortest possible time to resume activity, effluent of the reactor is returned by closed-circuit cycle。The recycle is done until the VFA was less than 400mg/L,And then capacity load of influent flow of the raw water is 1.13kgCODCr/(m3·d)。During the reactor running for some time,if it is that the effluent VFA<400mg/L,pH>6.6,the removal rate of CODCr above 80%,and gas production being normal,the capacity load of influent flow is increased by 1.70kgCODCr/(m3-d) during every stage steadily。At the end of the two reactors Start-up,the maximum capacity loads are 5.20kgCODcr/(m3·d),7.30kgCODCr/(m3·d) respectively,and the removal rate of CODCr is more than 85%。
During the start-up,by researching the CODCr,pH of the influent and effluent, VFA of effluent,water temperature and tank temperature,we can conclude some results as following。Under the influent load steady improvement,it does not take on positive correlation between effluent CODCr and influent CODCr during start-up。But effluent CODCr take a slight change,and more stable。Although the influent pH value fluctuated,the effluent pH values of 1#and 2# IC reactors are about at 7.0,7.1 stably。And also the effluent VFA more accurately reflect the rapid response of the changes in internal environment of IC reactor。The change of effluent pH value has lagged far behind changes of VFA。As with the enhancement of microbial activity,influent load increased,tenmerature difference of influent temperature and tank temperature is increasing gradually。The maximum tenmerature differences of 1# and 2# IC reactors are 4.5℃and 5.5℃。little change of influent temperature conditions can lead to uncertain relationship of influent temperature and tank temperature。
The sludge are washed out constantly during 1# IC reactor start-up,which is a normal phenomenon of sludge granulation。By comparing VSS/SS values of washed out slude and the sludge in reactor,we can found that VSS/SS value of wash out sludge gradually reduce,which is less than the value of reactor。Once granular sludge formates,the VSS/SS value gradually increases into the value of the reactor,and also the whole sludge sedimentation rate increase gradually。Although the granular sludge was washed out during 2#IC reactor start-up,the VSS/SS value is increasing from 0.803 to 0.838。Moreover,the microbial activity has been greatly improved。
引文
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