title: Studies on removing sulfachloropyridazine from groundwater with microbial bioreactors.
abstract: Sulfachloropyridazine (SCP), an antibiotic used in aquaculture and in animal husbandry, is a common contaminant in surface and groundwaters. Two types of microbial reactors were evaluated as methods for removing SCP from flowing water. One type of reactor evaluated was a nitrogen-limiting biobarrier; the other a slow-sand-filter. Results showed that the soybean oil-fed, nitrogen-limiting biobarrier was not very effective at removing SCP from flowing water. When supplied with flowing water containing 2.4 mg l(-1) SCP the nitrogen-limiting biobarrier removed ~0.6 mg l(-1) SCP or about 28% of that present. SCP removal by the nitrogen-limiting biobarrier may not have been biological as abiotic removal was not ruled out. More efficient biological removal was obtained with the slow-sand-filter which reduced the SCP levels from 2.35 to 0.048 mg l(-1), a removal efficiency of ~98%. High levels of nitrate nitrogen, 50 mg l(-1) N, did not interfere with the removal processes of either reactor suggesting that SCP was not being degraded as a microbial nitrogen source.
authors.affiliation: USDA-ARS, 2150-D Centre Avenue, Fort Collins, CO 80526-8119, USA. william.hunter@ars.usda.gov
authors.forename: William J
authors.initials: WJ
authors.lastname: Hunter
authors.forename: Dale L
authors.initials: DL
authors.lastname: Shaner
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D013410:Sulfachlorpyridazine / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; D013410:Sulfachlorpyridazine