The Research On The Processing Of Acid Wastewater Contain2,4,6-trichlorophenol By "Fe~0-ASBR" Coupling System

Based on the study of our own research group we found that “Fe0-anaerobicmicroorganisms”coupled system has obvious advantage on dealing with chlorinatedorganic compounds, but under some condition, such as acidic condition,“Fe0-anaerobic microorganisms”coupled system performed not as good as neutrallycondition, and according to the reports of some document that the reactor even can notstart directly when dealing with chlorine phenol wastewater. In this thesis, we usenaturalized sludge as experiment sludge, before adding the glucose, we do flaskshaking test to confirm the best quantity for “Fe0-anaerobic microorganisms”coupledsystem to degrade2,4,6-TCP, then the “Fe0-anaerobic microorganisms”coupledsystem was put in ASBR reactor under acidic condition for scale-up experiment, andthe scale-up experiment mainly study the influence between the dosage of Fe0and the“Fe0-ASBR” coupled system in dealing simulated acidic wastewater containing2,4,6-TCP, and get the following results:（1）The different flask shaking test indicate that as electron donors Fe0andglucose can adjust the anaerophyte system pH value in real time, and keep thedechlorination of microbial in best pH range, and thus improve the degradationefficiency of2,4,6-TCP in microorganism electron transport system. When theconcentration of2,4,6-TCP is30mg/L, and the concentration of glucose is range from500mg/L to5000mg/L, the concentration of glucose is more high, the degradationefficiency of2,4,6-TCP in “Fe0-anaerobic microorganisms”coupled system is slowly.Thus the study show that, when the concentration of glucose reaches5000mg/L, thesystem lose its ability to degrade2,4,6-TCP.（2）Adopting step down in-water pH method, the “Fe0-ASBR” coupled systemwas successfully induced to dealing chlorine phenol wastewater, and its degradationefficiency of2,4,6-TCP is100%，and the pH of out-water keeps around6.3, the CODkeeps around150mg/L, the concentration of Fe2+keeps around8mg/L, the wholesystem is very stable. If the system start under acidic condition, the pH, COD and theconcentration of Fe2+will change randomly, the system can not start.（3）After starting the reactor, addition of Fe0in “Fe0-ASBR” coupled systemcan increase the pH, keep the balance between acid producing microorganisms withIII the acid consumption, and increase the degradation efficiency of2,4,6-TCP, and wealso found that the addition of Fe0can help the system mineralize2,4,6-TCPcompletely, when the addition dosage of Fe0is0,50and100g in every liter of sludgeafter getting the ASBR running20days, the procedure to dechloridation willrespectively be:2,4,6-TCP�'2,4-DCP�'4-CP，2,4,6-TCP�'2,4-DCP�'4-CP�'phenoland2,4,6-TCP�'2,4-DCP�'4-CP�'phenol�'CH4+CO2.（4）The organic loading of co-substrate, namely glucose has great effect on theprocedure for “Fe0-ASBR” coupled system dealing acidic2,4,6-TCP wastewater whenthe organic loading is1.12kg COD/(m3·d), the reduction of2,4,6-TCP and COD is100%and70%respectively, the concentration of methylacetic in out-water is around20mg/L and pH is about6.2, the reactor works well, if we up the organic loading to2.18kg COD/(m3·d), after18days of degradation, the reduction of2,4,6-TCP andCOD is72%and22%respectively, and the concentration of methylacetic in out-wateris around276mg/L and pH is about4.8, the bacteria that producing hydrogenproduction of acetic acid, dechlorination and methanogens were inhibited, reactor wasmalfunction, if we low the organic loading to1.12kg COD/(m3·d), the reactor willwork normally after24days.The “Fe0-ASBR” coupled system can continuously degrade2,4,6-TCP100%afterstop add co-substrate by stored carbon source, but will degrade the sludge if the storedcarbon source has used up, and will release Fe2+, this will make the degradation of2,4,6-TCP down to90%, this kind of situation can be solved by add Fe0to the system,bring down the concentration of COD、 Fe2+in out-water, and the degradationefficiency of2,4,6-TCP will be100%. By means of GC-MS detection, we can foundthe degradation process of2,4,6-TCP after stop adding co-substrate is:2,4,6-TCP�'2,4-DCP�'4-CP.