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Nitrification and sludge characteristics in a submerged membrane bioreactor on synthetic inorganic wastewater [An article from: Desalination]
Book Details
PublisherElsevier
ISBN / ASINB000RQYYW2
ISBN-13978B000RQYYW2
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Desalination, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
A submerged membrane bioreactor (SMBR) treating ammonia-bearing synthetic inorganic wastewater withoutsludge purge was studied in respect to nitrification and microbial parameters over a period of 210 days. The reactor was operated at a hydraulic retention time (HRT) of 24 h, and the NH"4"-"N volumetric loading rate increased from 0.18 to 1.30 kg NH"4^+-N m^-^3d^-^1 by increasing influent NH"4^+-N from 180 mg/l^-^1 to 1300 mg/l^-^1. With the exception of a short period after the failure of pH control, the NH"4^+-N^+ removal rate, was constantly above 99%. Due to the influent characteristics and the interception of the membrane module, the mixed liquor suspended solids (MLSS) varied from 3000 to 5000 mg/l^-^1 and the nitrifying bacteria were dominant in the SMBR. The numbers of ammonia oxidizers and nitrite oxidizers in the mixed liquor increased from 0.9x10^8 ml^-^1 and 1.0x10^8 ml to 1.6x10^8 ml^-^1 and 9x10^8 ml^-^1 respectively, and the specific nitrification rate from 0.27 to 0.56 g NH"4^+-N g^-^1 SS^-^1 d^-^1. An increasing occurrence of extracellular polymeric substances (EPS) around microbial clusters with operation time was clearly observed on scanning electron micrographs (SEM). The pressure difference of the membrane module was not over 0.01 mPa over the whole operation period. Present results show that SMBR can be operated efficiently and stably as a high-rate nitrifying technology.
Description:
A submerged membrane bioreactor (SMBR) treating ammonia-bearing synthetic inorganic wastewater withoutsludge purge was studied in respect to nitrification and microbial parameters over a period of 210 days. The reactor was operated at a hydraulic retention time (HRT) of 24 h, and the NH"4"-"N volumetric loading rate increased from 0.18 to 1.30 kg NH"4^+-N m^-^3d^-^1 by increasing influent NH"4^+-N from 180 mg/l^-^1 to 1300 mg/l^-^1. With the exception of a short period after the failure of pH control, the NH"4^+-N^+ removal rate, was constantly above 99%. Due to the influent characteristics and the interception of the membrane module, the mixed liquor suspended solids (MLSS) varied from 3000 to 5000 mg/l^-^1 and the nitrifying bacteria were dominant in the SMBR. The numbers of ammonia oxidizers and nitrite oxidizers in the mixed liquor increased from 0.9x10^8 ml^-^1 and 1.0x10^8 ml to 1.6x10^8 ml^-^1 and 9x10^8 ml^-^1 respectively, and the specific nitrification rate from 0.27 to 0.56 g NH"4^+-N g^-^1 SS^-^1 d^-^1. An increasing occurrence of extracellular polymeric substances (EPS) around microbial clusters with operation time was clearly observed on scanning electron micrographs (SEM). The pressure difference of the membrane module was not over 0.01 mPa over the whole operation period. Present results show that SMBR can be operated efficiently and stably as a high-rate nitrifying technology.
