| 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。... |
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