Incorporating sulfur reactions and interactions with iron and phosphorus into a general plant-wide model

2018 ◽  
Vol 79 (1) ◽  
pp. 26-34 ◽  
Author(s):  
Hélène Hauduc ◽  
Tanush Wadhawan ◽  
Bruce Johnson ◽  
Charles Bott ◽  
Matthew Ward ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Optimization Design ◽  
Oxygen Demand ◽  
Phosphorus Release ◽  
Sulfur Cycle ◽  
Precipitate Formation ◽  
Treatment Processes ◽  
Whole Plant ◽  
Plant Process ◽  
P Removal

Abstract Sulfur causes many adverse effects in wastewater treatment and sewer collection systems, such as corrosion, odours, increased oxygen demand, and precipitate formation. Several of these are often controlled by chemical addition, which will impact the subsequent wastewater treatment processes. Furthermore, the iron reactions, resulting from coagulant addition for chemical P removal, interact with the sulfur cycle, particularly in the digester with precipitate formation and phosphorus release. Despite its importance, there is no integrated sulfur and iron model for whole plant process optimization/design that could be readily used in practice. After a detailed literature review of chemical and biokinetic sulfur and iron reactions, a plant-wide model is upgraded with relevant reactions to predict the sulfur cycle and iron cycle in sewer collection systems, wastewater and sludge treatment. The developed model is applied on different case studies.

scholarly journals Short investigation on occurrence and removal of semivolatiles during wastewater treatment processes

2021 ◽  
Vol 3 (2) ◽  
pp. 130-140
Author(s):  
Maria Diana Puiu ◽  
Keyword(s):  
Wastewater Treatment ◽  
Organic Contaminants ◽  
Biological Treatment ◽  
Organic Matter Content ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Matter Content ◽  
Physical Treatment ◽  
Dissolved Air Flotation ◽  
Treatment Processes

The food industry wastewater is known to present a high organic matter content, due to specific raw materials and processing activities. Even if these compounds are not directly toxic to the environment, high concentrations in effluents could represent a source of pollution as discharges of high biological oxygen demand may impact receiving river's ecosystems. Identifying the main organic contaminants in wastewater samples represents the first step in establishing the optimum treatment method. The sample analysis for the non-target compounds through the GC-MS technique highlights, along with other analytical parameters, the efficiency of the main physical and biological treatment steps of the middle-size Wastewater Treatment Plant (WWTP). Long-chain fatty acids and their esters were the main abundant classes of non-target identified compounds. The highest intensity detection signal was reached by n-hexadecanoic acid or palmitic acid, a component of palm oil, after the physical treatment processes with dissolved air flotation, and by 1-octadecanol after biological treatment.

Removal of pharmaceutical residue in municipal wastewater by DAF (dissolved air flotation)–MBR (membrane bioreactor) and ozone oxidation

2012 ◽  
Vol 66 (12) ◽  
pp. 2546-2555 ◽  
Author(s):  
Miyoung Choi ◽  
Dong Whan Choi ◽  
Jung Yeol Lee ◽  
Young Suk Kim ◽  
Bun Su Kim ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Ozone Oxidation ◽  
Dissolved Air Flotation ◽  
Treatment Processes ◽  
Pharmaceutical Residue ◽  
Dissolved Air

Growing attention is given to pharmaceutical residue in the water environment. It is known that pharmaceuticals are able to survive from a series of wastewater treatment processes. Concerns regarding pharmaceutical residues are attributed to the fact that they are being detected in water and sediment environment ubiquitously. Pharmaceutical treatment using a series of wastewater treatment processes of the DAF (dissolved air flotation)–MBR (membrane bioreactor)–ozone oxidation was conducted in the study. DAF, without addition of coagulant, could remove CODcr (chemical oxygen demand by Cr) up to over 70%, BOD 73%, SS 83%, T-N 55%, NH4+ 23%, and T-P 65% in influent of municipal wastewater. Average removal rates of water quality parameters by the DAF–MBR system were very high, e.g. CODcr 95.88%, BOD5 99.66%, CODmn (chemical oxygen demand by Mn) 93.63%, T-N 69.75%, NH4-N 98.46%, T-P 78.23%, and SS 99.51%, which satisfy effluent water quality standards. Despite the high removal rate of the wastewater treatment system, pharmaceuticals were eliminated to be about 50–99% by the MBR system, depending on specific pharmaceuticals. Ibuprofen was well removed by MBR system up to over 95%, while removal rate of bezafibrate ranged between 50 and 90%. With over 5 mg/l of ozone oxidation, most pharmaceuticals which survived the DAF–MBR process were removed completely or resulted in very low survival rate within the range of few micrograms per litre. However, some pharmaceuticals such as bezafibrate and naproxen tended to be resistant to ozone oxidation.

scholarly journals Light intensity affects the mixotrophic carbon exploitation in Chlorella protothecoides: consequences on microalgae-bacteria based wastewater treatment

2018 ◽  
Vol 78 (8) ◽  
pp. 1762-1771 ◽  
Author(s):  
Martina Pastore ◽  
Sergio Santaeufemia ◽  
Alberto Bertucco ◽  
Eleonora Sforza
Keyword(s):  
Wastewater Treatment ◽  
Light Intensity ◽  
Incident Light ◽  
Oxygen Demand ◽  
Continuous System ◽  
Chlorella Protothecoides ◽  
Oxygen Production ◽  
Production And Consumption ◽  
Algal Metabolism ◽  
P Removal

Abstract Microalgal-bacteria consortia application on wastewater treatment has been widely studied, but a deeper comprehension of consortium interactions is still lacking. In particular, mixotrophic exploitation of organic compounds by microalgae affects gas (CO2 and O2) exchange between microalgae and bacteria, but it is not clear how environmental conditions may regulate algal metabolism. Using a respirometric-based protocol, we evaluated the combined effect of organic carbon and light intensity on oxygen production and consumption by C. protothecoides, and found that the chemical oxygen demand (COD) was not consumed when incident light increased. Batch experiments under different incident lights, with C. protothecoides alone and in consortium with activated sludge bacteria, confirmed the results obtained by respirometry. Continuous system experiments testing the combined effects of light intensity and residence time confirmed that, under limiting light, mixotrophy is preferred by C. protothecoides, and the nutrient (COD, N, P) removal capability of the consortium is enhanced.

Modelling of full-scale wastewater treatment plants with different treatment processes using the Activated Sludge Model no. 3

2001 ◽  
Vol 44 (1) ◽  
pp. 49-56 ◽  
Author(s):  
M. Wichern ◽  
F. Obenaus ◽  
P. Wulf ◽  
K.-H. Rosenwinkel
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Phosphorus Removal ◽  
Large Scale ◽  
Wastewater Treatment Plants ◽  
Biological Phosphorus Removal ◽  
Activated Sludge Model ◽  
Treatment Processes ◽  
Biological Phosphorus ◽  
P Removal

In 1999 the Activated Sludge Model no. 3 (ASM 3) by the IWA task Group on Mathematical Modeling for Design and Operation of Biological Wastewater Treatment was presented. The model is used for simulation of nitrogen removal. On the basis of a new calibration of the ASM 3 with the easy degradable COD measured by respiration simulation runs of this paper have been done. In 2000 a biological phosphorus removal module by the EAWAG was added to the calibrated version of ASM 3 and is now serving the current requirements for modelling the enhanced biological P-removal. Only little experiences with different load situations of large-scale wastewater treatment plants were made with both new models so far. This article reports the experiences with the simulation and calibration of the biological parameters using ASM 3 and the EAWAG BioP Module. Three different large-scale wastewater treatment plants in Germany with different treatment systems will be discussed (Koblenz: pre-denitrification; Hildesheim: simultaneous denitrification with EBPR; Duderstadt: intermediate denitrification with EBPR). Informations regarding the choice of kinetic and stoichiometric parameters will be given.

scholarly journals Reuse of effluent discharged from tannery wastewater treatment plants by powdered activated carbon and ultrafiltration combined reverse osmosis system

2016 ◽  
Vol 7 (1) ◽  
pp. 97-102 ◽  
Author(s):  
Am Jang ◽  
Jong-Tae Jung ◽  
Hayoung Kang ◽  
Hyung-Soo Kim ◽  
Jong-Oh Kim
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Activated Carbon ◽  
Reverse Osmosis ◽  
Wastewater Treatment Plants ◽  
Oxygen Demand ◽  
Powdered Activated Carbon ◽  
Tannery Wastewater ◽  
Combined System ◽  
Treatment Processes

We evaluate the applicability of a reverse osmosis (RO) system that combines powdered activated carbon (PAC) and ultrafiltration (UF) to treat the effluent discharged from tannery wastewater treatment plants. Conventional treatment processes such as neutralization, clariflocculation, and biological processes are used to clean the effluent before feeding to the PAC and UF combined RO system. The efficiency of the combined system was evaluated using the chemical oxygen demand Mn (CODMn), color, pH, turbidity, total nitrogen, total phosphate, and conductivity. The PAC was effective in greatly reducing the CODMn and color. The turbidity and silt density index of the UF permeate satisfied the water quality indices required for the RO feed. The RO system was constantly maintained at approximately 75% RO recovery, and the RO permeate satisfied the water quality requirements for reusing the processed water. Therefore, the PAC-UF combined RO system can be used to process effluent discharged from tannery wastewater treatment plants for reuse.

scholarly journals A Highly Packed Biofilm Reactor with Cycle Cleaning for the Efficient Treatment of Rural Wastewater

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 369
Author(s):  
Yanan Luan ◽  
Chen Qiu ◽  
Yaoxian Li ◽  
Weichang Kang ◽  
Jianhua Zhang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Rural Areas ◽  
High Throughput Sequencing ◽  
Inorganic Nitrogen ◽  
Oxygen Demand ◽  
Biofilm Reactor ◽  
Efficient Treatment ◽  
Removal Capacity ◽  
Treatment Processes ◽  
Rural Wastewater

Biological treatment processes perform satisfactory in wastewater treatment, but the relatively high cost and complicated maintenance limit its application in rural areas. In this study, a highly packed biofilm reactor (HPBR), with a 90% packing ratio of carriers in the bioreactor, was designed for rural wastewater treatment. The results showed that the removal rates for chemical oxygen demand (COD) and ammonia were 3.04 ± 1.81 kg/m3/d and 0.49 ± 0.18 kg/m3/d, respectively. Besides, the removal efficiency of total inorganic nitrogen (TIN) was 35.4% by the HPBR. The removal capacity of the HPBR is higher than other reported systems with fewer operational costs and maintenance. High-throughput sequencing was applied to further investigate the kinetics and principals. Microorganisms capable of simultaneous nitrification-denitrification were found to be dominant species in the HPBR system, which indicated that the nitrogen removal in HPBR is governed by simultaneous nitrification-denitrification. These findings suggest that HPBR can be used as an efficient reactor for rural wastewater treatment, demonstrating its feasibility in real applications.

scholarly journals ASPECTS REGARDING THE ELECTROCOAGULATION APPLICATIONS IN THE WATER AND WASTEWATER TREATMENT

2016 ◽  
Vol 21 (2) ◽  
Author(s):  
AIDA DERMOUCHI ◽  
BENCHEIKH-LEHOCINE MOSSAAB ◽  
SIHEM ARRIS ◽  
VALENTIN NEDEFF ◽  
NARCIS BARSAN
Keyword(s):  
Wastewater Treatment ◽  
Electrode Materials ◽  
Treatment Time ◽  
Oxygen Demand ◽  
Water And Wastewater Treatment ◽  
Treatment Processes ◽  
Initial Ph ◽  
Water And Wastewater ◽  
Dc Current ◽  
Density Treatment

Electrocoagulation (EC) has been known for over a century. Applications in industry as water and wastewater treatment processes were adapted for the removal of suspended solids, organic compounds, COD (Chemical oxygen demand), BOD (biochemical oxygen demand), metallic and non-metallic pollution. The main advantage in EC technology is the fact that it works without the addition of chemical products. The DC current between metallic electrodes immersed in the effluent is used as an energy source for this technique, which causes their dissolution. The effect of the main parameters, current density, treatment time, initial pH, temperature, electrode materials, conductivity and distance between the electrodes were investigated. According to the conclusion of the works published in recent years, the removal efficiencies of pollutants materials by EC process are very important.

Towards the real-time monitoring of industrial wastewater treatment processes via photoelectrochemical oxygen demand measurements

2018 ◽  
Vol 4 (3) ◽  
pp. 394-402 ◽  
Author(s):  
Kimia Aghasadeghi ◽  
Melissa J. Larocque ◽  
David R. Latulippe
Keyword(s):  
Wastewater Treatment ◽  
Real Time ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Real Time Monitoring ◽  
Industrial Wastewater Treatment ◽  
The Real ◽  
Treatment Processes ◽  
Photoelectrochemical Oxidation

Photoelectrochemical oxidation of different macromolecules was studied to investigate the potential of peCOD for use in industrial wastewater treatment.

Acidogenic phosphorus recovery from iron-facilitated primary sedimentation sludge in wastewater treatment

2019 ◽  
Vol 26 (2) ◽  
pp. 72-79
Author(s):  
Ruohong Li ◽  
Xiaoyan Li
Keyword(s):  
Wastewater Treatment ◽  
Iron Reduction ◽  
Municipal Wastewater ◽  
Oxygen Demand ◽  
Wastewater Sludge ◽  
Phosphorus Recovery ◽  
Chemical Leaching ◽  
Dissimilatory Iron Reduction ◽  
Easy Operation ◽  
P Removal

In this study, a novel acidogenic phosphorus recovery (APR) process was developed in combination with iron-facilitated primary sedimentation for enhanced phosphorus (P) removal and recovery in wastewater treatment. Compare with the current P recovery methods from the wastewater sludge by acidic chemical leaching, the new method process has advantages such as easy operation, high recovery efficiency, valuable by-products and little secondary pollution. The experimental results show that over 94.6% chemical oxygen demand (COD) and 89.6% P were reliably removed from municipal wastewater. In fermentation system, more than 80% of total Fe was reduced as Fe(II) through dissimilatory iron reduction in fermenters and about 40% of total P can be recovered from the wastewater influent in the form of vivianite. Acidogenic fermentation and dissimilatory iron reduction were identified as two essential processes for the P release and recovery from the sludge.

scholarly journals Application of aluminum-based coagulants for improving efficiency of flue gas desulfurization wastewater treatment in coal – fired power plant

2019 ◽  
Vol 108 ◽  
pp. 02006
Author(s):  
Piotr Marcinowski ◽  
Jan Bogacki ◽  
Maciej Majewski ◽  
Jarosław Zawadzki ◽  
Sridhar Sivakumar
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Flue Gas ◽  
Power Plants ◽  
Oxygen Demand ◽  
Flue Gas Desulfurization ◽  
Treatment Processes ◽  
Metals Removal ◽  
Global Threat ◽  
Desulfurization Wastewater

Pollution released into the environment as the result of the combustion of energy fuels is a significant global threat. For instance, wastewater in coal–fired power plants is often heavily polluted by organic compounds, heavy metals and boron. Therefore, there is an urgent need for efficient flue gases and wastewater treatment. However, to be industrially implemented, the treatment processes have to be simultaneously effective and inexpensive. This research systematically studied the efficiency of inexpensive coagulation processes using aluminum-based coagulants applied to flue gas desulfurization (FGD) wastewater treatment. Additionally, the differences in the efficiency of total organic carbon (TOC) and chemical oxygen demand (COD) removal between sedimentation and coagulation processes were systematically studied. It was found that coagulation with the appropriate dose of PAX19XL coagulant achieved a satisfactory effect with significant boron removal and almost complete heavy metals removal. The polyelectrolyte use did not improve coagulation effectiveness and did not accelerate sludgesedimentation and volume decreasing. The detailed statistical analyses did not confirm the positive, pronounced effect of coagulation compared to sedimentation, although there were observed exceptions that should be considered separately. The results obtained suggest that inexpensive aluminum-based coagulants may be effective in improving the efficiency of flue gas desulfurization wastewater treatment in coal–fired power plants.

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