scholarly journals DEVELOPMENT OF AUTOTROPHIC DENITRIFICATION FOR NITRATE-CONTAMINATED INDUSTRIAL WASTEWATER

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Rudi Nugroho
Keyword(s):  
Rate Constant ◽  
Industrial Wastewater ◽  
Packed Column ◽  
Order Reaction ◽  
Synthetic Wastewater ◽  
Nitrate Content ◽  
Thiobacillus Denitrificans ◽  
Autotrophic Denitrification ◽  
Biofilm Thickness ◽  
Denitrification Kinetics

An autotrophic denitrification system was developed for treatment wastewater from steel industry. The aim was to evaluate the kinetics and capability of the system in reducing nitrate content in such industrial wastewater. The experiments were conducted in batch suspension and continuous runs. The denitrification kinetics in suspension runs obeys first order reaction with the rate constant k1 and k2 were determined to be 0.014 and 0.004 g-N/m3.d, respectively. The continuous runs used a column packed with mixture of granular sulfur and limestone. The microbes of Thiobacillus denitrificans were attached on the surface of granular sulfur in the form of biofilm. The biofilm thickness was investigated to be approximately 40 μm. The denitrification kinetics in the packed column obeys half-order reaction with the rate constant k of 0.172 g-N1/2.m1/2/(kg-S.d). The lower denitrification extent of industrial wastewater compared with the synthetic wastewater might be due to the lack of alkalinity. Keywords: Autotrophic denitrification, sulfur, packed column, thiobacillus denitrificans.

Denitrification of industrial wastewater with sulfur and limestone packed column

2002 ◽  
Vol 46 (11-12) ◽  
pp. 99-104 ◽  
Author(s):  
R. Nugroho ◽  
H. Takanashi ◽  
M. Hirata ◽  
T. Hano
Keyword(s):  
Industrial Wastewater ◽  
Dominant Species ◽  
Elemental Sulfur ◽  
Packed Column ◽  
Steel Production ◽  
Thiobacillus Denitrificans ◽  
Autotrophic Denitrification ◽  
Treatment Performance ◽  
Biofilm Process ◽  
Kinetics Of

An autotrophic denitrification system was developed for nitrate contaminated industrial wastewater whose C/N ratio was very low. The microbes containing Thiobacillus denitrificans as a dominant species were attached on the surface of granular elemental sulfur packed in a column. Elemental sulfur was used as an electron donor for autotrophic denitrification. The granules of limestone were mixed with the granular sulfur to moderate the decrease of alkalinity during autotrophic denitrification. The stoichiometry and basic kinetics of denitrification were studied in column runs. The effects of minerals such as phosphorus on treatment performance were clarified. The wastewater from steel production plants was treated by the present biofilm process. Low extent of nitrogen removal was caused by the lack of minerals.

A Kinetic Model for Autotrophic Denitrification using Sulphur:Limestone Reactors

2003 ◽  
Vol 38 (1) ◽  
pp. 183-192 ◽  
Author(s):  
Ashref Darbi ◽  
Thiruvenkatachari Viraraghavan
Keyword(s):  
Particle Size ◽  
Kinetic Model ◽  
Reaction Rate ◽  
Average Particle Size ◽  
Order Reaction ◽  
Average Particle ◽  
Thiobacillus Denitrificans ◽  
Autotrophic Denitrification ◽  
Reaction Rate Constants ◽  
Kinetics Of

Abstract The kinetics of autotrophic denitrification of groundwater by Thiobacillus denitrificans in a sulfur:limestone upflow reactor was examined in order to predict effluent concentrations. Experiments were performed using water containing 60 and 90 mg NO3—N/L and sulfur and limestone with average particle size of 3.5 mm. Results clearly showed that nitrate was completely removed from 60 and 90 mg NO3—N/L influent concentrations. The results showed that the autotrophic denitrification rates in sulfur:limestone reactors can be described by half-order kinetics. The half-order reaction rate constants for the entire media were estimated at 1.34 and 1.54 mg1/2/L1/2 h for influent concentrations of 60 and 90 mg NO3—N/L, respectively.

Wastewater treatment and nutrient removal in the combined reactor

1998 ◽  
Vol 38 (1) ◽  
pp. 87-95 ◽  
Author(s):  
M. Roš ◽  
J. Vrtovšek
Keyword(s):  
Organic Compounds ◽  
Industrial Wastewater ◽  
Design Procedure ◽  
Order Reaction ◽  
Treated Wastewater ◽  
Nitrification Rate ◽  
Zero Order Reaction ◽  
Aerobic Reactor ◽  
Complex Organic

A combined anaerobic anoxic aerobic reactor for the treatment of the industrial wastewater that contains nitrogen and complex organic compounds as well as its design procedure is presented. The purpose of our experiments was to find a simple methodology that would provide combined reactor design. The reactor is based on the combination of anaerobic, anoxic and aerobic process in one unit only. It was found that the HRT even under 1 hour in the anaerobic zone is long enough for the efficient transformation of complex organic compounds into readily biodegradable COD which is then used in dentrification process. In the N-NO3 concentration range 1.5-50 mg/l the denitrification rate could be expressed as half-order reaction when the CODrb was in excess. N-NO3 removal efficiency is controlled by the recycle flow from the aerobic to the anoxic zone. Nitrification rate can be expressed as first, half or zero-order reaction with respect to effluent N-NH4 concentration. Nitrification rate depends on the dissolved oxygen concentration and hydrodynamic conditions in the reactor. Case study for design of a pilot plant of the combined reactor for treatment of pre-treated pharmaceutical wastewater is shown. Characteristics of pre-treated wastewater were: COD=200 mg/l, BOD5=20 mg/l, N-Kjeldahl=80 mg/l, N-NH4=70 mg/l, N-NOx<1 mg/l, P-PO4=5 mg/l. Legal requirements for treated wastewater were: COD=<100 mg/l, BOD5<5 mg/l, N-NH4=<1 mg/l, N-NOx=<10 mg/l.

Selective removal and recovery of phosphate in a novel fixed-bed process

1996 ◽  
Vol 33 (10-11) ◽  
pp. 139-147 ◽  
Author(s):  
Dongye Zhao ◽  
Arup K. Sengupta
Keyword(s):  
Industrial Wastewater ◽  
Laboratory Experiments ◽  
Fixed Bed ◽  
Sorption Process ◽  
Selective Removal ◽  
Synthetic Wastewater ◽  
Chelating Polymer ◽  
Efficient Regeneration ◽  
Polymeric Ligand ◽  
Removal And Recovery

This paper reports salient features of a new fixed-bed sorption process in regard to ultimate removal and recovery of phosphate from municipal and industrial wastewater. The sorbent, referred to as polymeric ligand exchanger(PLE), is essentially a copper(II) loaded specialty chelating polymer. Laboratory experiments have demonstrated that the PLE: can remove phosphate selectively from municipal and synthetic wastewater; is amenable to efficient regeneration; and provides opportunities to recover phosphate and reuse the spent regenerant for multiple numbers of cycles.

scholarly journals Determination of exothermic batch reactor specific model parameters

2019 ◽  
Vol 292 ◽  
pp. 01063
Author(s):  
Lubomír Macků
Keyword(s):  
Rate Constant ◽  
Reaction Rate ◽  
Batch Reactor ◽  
Specific Model ◽  
Reaction Rate Constant ◽  
Order Reaction ◽  
First Order Reaction ◽  
Model Parameters ◽  
Reactor Model ◽  
First Order

An alternative method of determining exothermic reactor model parameters which include first order reaction rate constant is described in this paper. The method is based on known in reactor temperature development and is suitable for processes with changing quality of input substances. This method allows us to evaluate the reaction substances composition change and is also capable of the reaction rate constant (parameters of the Arrhenius equation) determination. Method can be used in exothermic batch or semi- batch reactors running processes based on the first order reaction. An example of such process is given here and the problem is shown on its mathematical model with the help of simulations.

Equilibrium and Kinetic Studies for the Biosorption of Aqueous Nickel(II) Ions onto the Pseudomonas alcaligenes Biomass

2010 ◽  
Vol 171-172 ◽  
pp. 41-44
Author(s):  
Xiao Cun Xiao ◽  
Gai Xia Fang ◽  
Er Li Zhao ◽  
Lv Bin Zhai ◽  
Jun Shuai Shi
Keyword(s):  
Industrial Wastewater ◽  
Chemical Interaction ◽  
Kinetic Studies ◽  
Synthetic Wastewater ◽  
Order Kinetic ◽  
Adsorption Capacities ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Pseudomonas Alcaligenes ◽  
Batch Biosorption

The objective of this study is to assess the environmentaly friendly Ni(II) adsorption from synthetic wastewater using Pseudomonas alcaligenes biomass (PA-2). The ability of PA-2 to remove the Ni(II) ions was investigated by using batch biosorption procedure. The effects such as pH, dosage of biosorbent, Ni(II) initial concentration and sorbate–sorbent contact time and agitating speed on the adsorption capacities of PA-2 were studied. Biosorption equilibriums were rapidly established in about 60 min and the adsorption kinetics followed the pseudo-second order kinetic model. The maximum Ni(II) adsorption capacity determined from Langmuir isotherm were 82.23 mg/g PA-2 at pH 5.0, at 25±2°C and shaker speed 150 rpm, respectively. The carboxyl , hydroxyl and amino groups of the PA-2 were involved in chemical interaction with the Ni(II) ions depicted by Fourier transform infrared spectroscopic (FTIR) results. The study points to the potential of new use of Pseudomonas alcaligenes biomass as an effective biosorbent for the removal of Ni(II) and from environmental and industrial wastewater.

scholarly journals Light-driven nitrous oxide production via autotrophic denitrification by self-photosensitized Thiobacillus denitrificans

2019 ◽  
Vol 127 ◽  
pp. 353-360 ◽  
Author(s):  
Man Chen ◽  
Xiao-Fang Zhou ◽  
Yu-Qing Yu ◽  
Xing Liu ◽  
Raymond Jian-Xiong Zeng ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Thiobacillus Denitrificans ◽  
Autotrophic Denitrification ◽  
Oxide Production ◽  
Nitrous Oxide Production

Nutrients removal in hybrid fluidised bed bioreactors operated with aeration cycles

2007 ◽  
Vol 55 (8-9) ◽  
pp. 51-58 ◽  
Author(s):  
M.A. Martín Martín ◽  
L. López Enríquez ◽  
M. Fernández-Polanco ◽  
S. Villaverde ◽  
P.A. García-Encina
Keyword(s):  
Total Nitrogen ◽  
Industrial Wastewater ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Operating Conditions ◽  
Synthetic Wastewater ◽  
Fluidised Bed ◽  
Total N ◽  
Biological Communities ◽  
Gradient Gel Electrophoresis ◽  
Polymerase Chain

Two hybrid fluidised bed reactors filled with sepiolite and granular activated carbon (GAC) were operated with short cycled aeration for removing organic matter, total nitrogen and phosphorous, respectively. Both reactors were continuously operated with synthetic and/or industrial wastewater containing 350–500 mg COD/L, 110–130 mg NKT/L, 90–100 mg NH3-N/L and 12–15 mg P/L for 8 months. The reactor filled with sepiolite, treating only synthetic wastewater, removed COD, ammonia, total nitrogen and phosphorous up to 88, 91, 55 and 80% with a hydraulic retention time (HRT) of 10 h, respectively. These efficiencies correspond to removal rates of 0.95 kgCODm−3d−1 and 0.16 kg total N m−3d−1.The reactor filled with GAC was operated for 4 months with synthetic wastewater and 4 months with industrial wastewater, removing 98% of COD, 96% of ammonia, and 66% of total nitrogen, with an HRT of 13.6 h. No significant phosphorous removing activity was observed in this reactor. Microbial communities growing with both reactors were followed using polymerase chain reaction (PCR) and denaturing gradient gel electrophoresis (DGGE) techniques. The microbial fingerprints, i.e. DGGE profiles, indicated that biological communities in both reactors were stable along the operational period even when the operating conditions were changed.

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