Journal ArticleDOI
Nitrification/Denitrification in Intermittent Aeration Process for Swine Wastewater Treatment
Jiayang Cheng,Bin Liu +1 more
TLDR
In this article, a continuous flow intermittent aeration (IA) process has been studied for nitrogen removal from anaerobically digested swine wastewater with high ammonium content.Abstract:
A continuous-flow intermittent aeration (IA) process has been studied for nitrogen removal from anaerobically digested swine wastewater with high ammonium content. High nitrogen removal efficiency of average 91% total Kjeldahl nitrogen and 92% NH4-N was achieved in an IA system with an alteration of 1-h aeration and 1-h nonaeration. Nitrification and denitrification were found to be responsible for the nitrogen removal in the system. Nitrite and nitrate in the effluent were less than 1.0 mg/L and 8.0 mg/L, respectively. The specific nitrification and denitrification rates of the single-sludge IA culture were determined through batch experiments as 2.79–3.70 mgNO3-N/g volatile suspended solids-h and 0.59–1.03 mgNO3-N/g volatile suspended solids-h, respectively. In the IA process, the aeration period created favorable conditions for nitrifying bacteria (dissolved oxygen = 4–6 mg/L and oxidation-reduction potential = 80–100 mV), while the nonaeration period provided good environment for denitrifying bacteria...read more
Citations
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A review of membrane bioreactors and their potential application in the treatment of agricultural wastewater
TL;DR: Cicek et al. as discussed by the authors summarized the potential applications of the membrane bioreactor technology for the treatment of wastewater from agricultural sources and used it for treating manure and wastewater from livestock operations to levels suitable for direct reuse or safe discharge to surface water bodies.
Journal ArticleDOI
Endoplasmic reticulum stress-induced cell death requires mitochondrial membrane permeabilization
TL;DR: The working hypothesis is that MMP may be a rate-limiting event of apoptosis induction even when cell death is initiated through a primary stimulus affecting other organelles than mitochondria such as nuclei, lysosomes or the endoplasmic reticulum.
Journal ArticleDOI
Effects of aeration cycles on nitrifying bacterial populations and nitrogen removal in intermittently aerated reactors.
TL;DR: In this paper, the effects of the lengths of aeration and nonaeration periods on nitrogen removal and the nitrifying bacterial community structure were assessed in intermittently aerated (IA) reactors treating digested swine wastewater.
Journal ArticleDOI
Improvement in post-treatment of digested swine wastewater
TL;DR: Judged from the investment, oxygen demand, sludge yield, biogas production and running cost, the traditional combined anaerobic-SBR process is unfeasible to treat swine wastewater, while the combined an aerobic- SBR process with addition of raw Swine wastewater can be a suitable biotechnology.
Journal ArticleDOI
Wastewater nitrogen removal in Sbrs, applying a step-feed strategy: from lab-scale to pilot-plant operation.
TL;DR: To make using easily biodegradable organic matter more efficient, the filling phases of SBR cycles were adjusted according to a step-feed strategy composed of 6 anoxic-aerobic events, demonstrating that the methodology may be useful in treating real wastewater with high carbon and nitrogen variations.
References
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Book
Wastewater Engineering Treatment Disposal Reuse
TL;DR: Wastewater Engineering: An Overview of Wastewater Engineering, Methods and Implementation Considerations as mentioned in this paper is a good starting point for a discussion of the issues of wastewater engineering. But, it is not a complete survey of the entire literature.
Journal ArticleDOI
Denitrification with methanol: Fundamental study of the growth and denitrification capacity of Hyphomicrobium sp
P. Timmermans,A.A. Van Haute +1 more
TL;DR: HyHyphomicrobrium spp was found as dominant organism in a two-sludge nitrifying-denitrifying wastewater treatment system with methanol as external carbon source as discussed by the authors.
Book
Environmental engineers' handbook
David H.F. Liu,Bela G. Liptak +1 more
TL;DR: In this article, environmental laws and regulations Environmental Impact Assessment Pollution Prevention in Chemical Manufacturing Standards Air Pollution Noise Pollution Wastewater Treatment Removing Specific Water Contaminants Groundwater and Surface Water Pollution Solid Waste Hazardous Waste
Journal ArticleDOI
Effect of temperature and pH value on the growth-rate constants of nitrifying bacteria in the activated-sludge process
H.A. Painter,J.E. Loveless +1 more
TL;DR: In this paper, the specific growth rates of nitrifying organisms were determined under non-equilibrium conditions in laboratory-scale activated sludge plants at three temperatures and six pH values.