The evaluation of enhanced nitrification by immobilized biofilm on a clinoptilolite carrier.
This study was conducted to evaluate the effect of clinoptilolite on nitrification in activated sludge (AS), and was focused on a relationship between ammonium exchange capacity of this mineral and improvement of nitrification. In batch experiments, the adsorption property of biofilm-attached clinoptilolite did not show substantial difference from that of natural clinoptilolite, indicating that bioregeneration became completely achieved without any regenerant in the AS. The AS with added clinoptilolite (ZR) was compared to the control AS (CR) when the ratio of chemical oxygen demand (COD) to total kjeldahl nitrogen (TKN) of influent, i.e. C/N ratio, was varied from 3.25 to 7.5 at a hydraulic retention time (HRT) of 3 h. Enhanced nitrification was comparatively observed for the ZR as C/N ratio gradually increased. The results indicated that the clinoptilolite provided a relatively low C/N ratio for nitrifiers, due to ammonium adsorption of this mineral, and consequently nitrification was accelerated.
Park
Se Jin
SJ
Division of Environmental and Geosystem Engineering, Inha University, Inchon, Republic of Korea. g1991322@inhavision.inha.ac.kr
Lee
Hyung Sool
HS
Yoon
Tae Il
TI
D000327:Adsorption; D018441:Biofilms; D019149:Bioreactors; D001709:Biotechnology; D009584:Nitrogen / Q000737:chemistry / Q000378:metabolism*; D010100:Oxygen / Q000737:chemistry; D011188:Potassium / Q000737:chemistry; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012964:Sodium / Q000737:chemistry; D013997:Time Factors; D017641:Zeolites / Q000737:chemistry*
D000644:Quaternary Ammonium Compounds; C083175:clinoptilolite; D017641:Zeolites; D012964:Sodium; D009584:Nitrogen; D011188:Potassium; D010100:Oxygen