Advanced Oxidation Treatment of Papermaking Wastewater by Homogeneous Fenton Reaction

2013 ◽  
Vol 726-731 ◽  
pp. 2510-2514 ◽  
Author(s):  
Hong Ping He ◽  
De Li Wu
Keyword(s):  
Removal Rate ◽  
Paper Industry ◽  
First Grade ◽  
Advanced Treatment ◽  
Treatment Processes ◽  
Quality Of Water ◽  
Optimum Reaction ◽  
Oxidation Technology ◽  
Papermaking Wastewater

The quality of water from traditional two-stage biochemical treatment process of papermaking wastewater cannot meet the pollutants discharge standard of paper industry,therefore it is necessary to develop new advanced treatment processes to further treat the effluent. This paper adopts the homogeneous Fenton oxidation technology to treat the effluent from a secondary sedimentation tank of a papermaking factory by batch experiments. The optimum reaction conditions are H2O2dosage 6.54mmol/L, FeSO4.7H2O dosage 200mg/L, pH=3, t=1.5h and of all the experiments the dosage of polyacrylamide is 3ppm. The COD of the treated water is under 50mg/L and its removal rate can reach as high as 75.4%, the chroma almost falls to zero, the effluent meets the first grade of the national wastewater discharge standard. Therefore, the homogeneous Fenton is an effective alternative for papermaking wastewater advanced treatment, due to its high effect.

scholarly journals Mn/sepiolite as the heterogeneous ozonation catalysts applied to the advanced treatment of regenerated-papermaking wastewater

2016 ◽  
Vol 75 (5) ◽  
pp. 1025-1033 ◽  
Author(s):  
Zheng Cheng ◽  
Rendang Yang ◽  
Yang Wang
Keyword(s):  
Reaction Pathway ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Catalytic Ozonation ◽  
Treated Wastewater ◽  
Precipitation Method ◽  
Advanced Treatment ◽  
Heterogeneous Catalytic ◽  
High Removal Rate ◽  
Papermaking Wastewater

Herein a Mn-deposited sepiolite catalyst was obtained through a facile co-precipitation method, and then used as the heterogeneous ozonation catalysts applied to the tertiary treatment of regenerated-papermaking wastewater. During the process, the as-prepared catalyst was endowed with higher Brunauer–Emmett–Teller specific surface area of 412.3 m2/g compared to 124.6 m2/g of the natural sepiolite. Hence, in the adsorption of methylene blue, the as-prepared catalyst was observed with a very high removal rate of 96.2% although a little lower than the modified sepiolite of 97.5% in 100 min. And for practical application, the catalyst was used for treating the effluent from regenerated-papermaking industry, via a heterogeneous catalytic ozonation process. Consequently, the highest color removal rate of 99.5%, and the highest chemical oxygen demand (COD) removal efficiency of 73.4% were achieved in 20 and 30 min, respectively. As a result, the treated wastewater was more biodegradable and less toxic; the biochemical oxygen demand (BOD5)/COD value could reach 0.41. Moreover, the catalyst showed superior stability at successive ozonation runs. The main possible reaction pathway is also presented. The results indicate that catalytic ozonation was proved to be effective when Mn/sepiolite was used as catalysts applied to the advanced treatment of regenerated-papermaking wastewater.

The Research with Advanced Oxidation Technology to Degrade Organic Matter in Micro-Polluted Water

2011 ◽  
Vol 219-220 ◽  
pp. 804-808
Author(s):  
Xia Zhao ◽  
He Ming Luo ◽  
Hui Xia Feng ◽  
Jian Qiang Zhang
Keyword(s):  
Organic Matter ◽  
Potassium Permanganate ◽  
Removal Rate ◽  
Water Environment ◽  
Pollution Index ◽  
Advanced Oxidation ◽  
Polluted Water ◽  
Advanced Oxidation Technology ◽  
Oxidation Technology

Potassium permanganate process is an advanced oxidation technique that can provide a resolution removing organic matter in contaminated water. In this paper, the combination of composite potassium permanganate and a certain coagulant used in this process, which it was particularly suited to rapidly oxidize and degrade pollutants. It was an effective enhanced coagulation, advanced oxidation technique that could be conducted in a normal micro-polluted water environment. A series of experiment results demonstrated that the best adding quantity of composite potassium permanganate was 1.5-3.0mg/l, the best adding quantity of PFS as the coagulant was 25mg/l. Under the above conditions, potassium permanganate oxidation obviously reduced to each pollution index and greatly improved the water quality of purification of micro-polluted water. Furthermore, the organic removal rate with composite potassium permanganate was more than the unitary potassium permanganate process and the current traditional process.

Experimental Study on Papermaking Wastewater by Advanced Electrochemical Oxidation Method

2013 ◽  
Vol 726-731 ◽  
pp. 1699-1703
Author(s):  
Lin Lin Huang ◽  
Jun Feng Liu ◽  
Bin Sun ◽  
Nan Zhang ◽  
Yong Qing Tang ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Current Density ◽  
Treatment Time ◽  
Oxygen Demand ◽  
Treatment Method ◽  
Electrochemical Reactor ◽  
Advanced Treatment ◽  
Processing Unit ◽  
Optimum Reaction ◽  
Papermaking Wastewater

Papermaking wastewater effluent from a biological processing unit was treated by an advanced treatment method-electrochemical oxidation process. The experiments were carried out in an electrochemical reactor using RuO2\SnO2 coated on titanium as anode and stainless steel as cathode. The changes of Chemical Oxygen Demand (COD) reduction and other relative parameters have been determined as a function of treatment time and applied current density. The optimum reaction time and current density was 60min and 5mA/cm2, respectively. Results indicate that as an advanced treatment method, electrochemical oxidation can treat papermaking wastewater to achieve the standard of effluents effectively.

Treatment Project for Wastewater from Automobile Painting

2012 ◽  
Vol 209-211 ◽  
pp. 1986-1989
Author(s):  
Yu Ping Tian ◽  
Shuang Shuang Kong
Keyword(s):  
Removal Rate ◽  
Wastewater Discharge ◽  
Quality Of Water ◽  
Air Flotation ◽  
Pre Treatment ◽  
Primary Standards ◽  
Biological Methods

In this experiment, the combination of physic-chemical and biological methods was applied. Firstly, degreasing wastewater and painting wastewater were pretreated by chemicals respectively. And the removal rate of CODCr is more than 50% and about 65% respectively. After pretreatment，the effluents together with electrophoresis wastewater were treated by the coagulation-flotation and SBR process. And the removal rate of CODCr reached more than 80%, which achieved primary standards of "Integrated Wastewater Discharge Standard"(GB8978-1996). After the separated pre-treatment, the consuming amount of the chemicals had obviously lowered than the conventional mixing treatment, as well as the sludge. Most importantly, this process ensures good quality of water. So it is feasible economically and technically to use separated pretreatment, air flotation and SBR to treat automotive painting wastewater.

Study on Advanced Treatment of Pulping and Papermaking Process Effluent by Immobilized Laccase

2011 ◽  
Vol 233-235 ◽  
pp. 712-715
Author(s):  
Sen Wang ◽  
An Long Zhang ◽  
Xin Ping Li ◽  
Zhao Rong Wang
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Rotation Speed ◽  
Orthogonal Test ◽  
Advanced Treatment ◽  
Single Factor ◽  
Optimum Conditions ◽  
Immobilized Laccase ◽  
Papermaking Wastewater

The lacasse was immobilized by sodium alginate for papermaking wastewater treatment. The influence of the important factors on the treatment effect was studied by single factor test; and the optimized condition of immobilized lacasse treating papermaking wastewater was investigated by orthogonal test. The result shows that the optimum conditions are pH4, reaction time is 24h, shaker rotation speed is 160r/min, and reaction temperature is 40°C. The decoloring rate reach 73.3%, the COD removing rate is more than67.2%, the average CODCr and chroma of the treated water respectively are 98.3mg/L and 45.4times, The quality of the final water not only can completely satisfies the new discharge standard, but also the recycle requirements.

scholarly journals Invisible pollutants: environmental, economic and social impacts as a threat to water quality

2019 ◽  
pp. 1
Author(s):  
Maria Cláudia Da Silva Antunes de Souza ◽  
Greyce Kelly Antunes de Souza
Keyword(s):  
Water Quality ◽  
Environmental Control ◽  
Economic Impacts ◽  
Aquatic Communities ◽  
Treatment Processes ◽  
Quality Of Water ◽  
Routine Monitoring ◽  
Economic And Social Impacts ◽  
Concentration Limits

The object of this study is a discussion on the environmental, social and economic impacts of invisible pollutants as a threat to water quality and sustainability. The investigation is geared towards contributing to effective sustainability, taking into account its threat by invisible pollutants and the fact that these pollutants are not included in routine monitoring programs of Health and Environmental bodies, nor are they incorporated to standards or legislation for environmental control. The work was then divided, and it first analyzes the importance of water quality in the attainment of sustainability. Next, it analyzes the Brazilian law on water resources; and finally, it discusses the challenges to maintain the quality of water considering the environmental, social and economic impacts of invisible pollutants. After detailed study, it is perceived that the reason for concern is that these minuscule molecules are resistant to conventional water treatment processes. They can even become increasingly toxic and pollute the noblest resource: water. For this reason, water, even after treatment, can still contain residual contaminants which, after reaching their concentration limits, become toxic and change aquatic communities. This is a critical situation, since all impacts of these molecules are still not entirely known.

scholarly journals Performance evaluation of the sewage treatment system SANEBOX

2021 ◽  
Vol 7 (1) ◽  
pp. 161-165
Author(s):  
Marcus Vinicius Faria de Araujo ◽  
Luisa Jardim Faria de Araujo e Sousa ◽  
Marina Jardim Faria de Araujo
Keyword(s):  
Sewage Treatment ◽  
Oxygen Demand ◽  
Treatment System ◽  
Environmental Standards ◽  
Treatment Processes ◽  
Quality Of Water ◽  
Environmental Goals ◽  
Sewage Treatment System ◽  
Made In

Sewage treatment processes have been increasingly the target of research aimed at developing solutions that meet environmental standards at lower costs for society. The generation of sanitary sewage and its final release, without treatment or with inefficient treatment in sewage networks, lakes, rivers or oceans have aggravated the quality of water resources and put at risk the health of the population given water-delivery diseases. This article aimed to evaluate the results obtained by the Treatment System called SANEBOX, for the treatment of sanitary sewage, considering a period of two years of monitoring campaigns in it. Additionally, a comparison is made in terms of achieving environmental goals of this System with other conventional technologies that have usually been implemented in Brazil. The guiding parameters for this evaluation were Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Sedimentable Materials (SM), Total Suspension Solids (TSS), Vegetable or Animal Oils and Greases (OGv/a), Tensoactive Substances That React to Methylene Blue (MBAS), Ammoniacal Nitrogen (N-NH4+) and Phosphorus (P). The results obtained show that the SANEBOX System has similar performance and, in some parameters, much higher than the conventional Sewage Treatment System, either in terms of removal of pollutants, or in terms of occupied area, energy consumption and nuisance to neighborhoods by bad odors.

Study on the Advanced Treatment Secondary Effluent of WWTPs by Coagulation

2011 ◽  
Vol 142 ◽  
pp. 165-168
Author(s):  
Yue Liu ◽  
Fu Xiang Li ◽  
Chun Peng Zhang
Keyword(s):  
Removal Rate ◽  
Advanced Treatment ◽  
Secondary Effluent ◽  
Optimal Dosage ◽  
Laboratory Results

The secondary effluent of WWTPs can be treated by the coagulation advancedly. The laboratory results showed that, PFS and PAC had lower efficient for the treatment of pollutants, and the effluent can not meet the requirements, so they were not s uitable as the coagulant. The PSFA, produced by the laboratory, had a higher removal rate of pollutants, and the quality of effluent can meet the relevant requirements of the standards, so it can be used as the coagulant of advanced treatment. The results of the experiment showed that the optimal dosage of PSFA was 20mg/L, and the COD, SS, turbidity, chromaticity, and TP of effluent were 9.5mg/L, 4.9mg/L, 2.7NTU, 10times and 0.15mg/L respectively.

DECOLOURIZATION AND COD REMOVAL OF WASEWATER FROM ETHANOL PRODUCTION PROCESS FROM MOLASSES BY COAGULANTION USING INORGANIC ALUM

2010 ◽  
Vol 13 (3) ◽  
pp. 92-102
Author(s):  
Trung Duc Le
Keyword(s):  
Ethanol Production ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Treated Wastewater ◽  
Treatment Processes ◽  
Physico Chemical ◽  
Biological Methods ◽  
Treatment Step ◽  
Main Material

The industrial production of ethanol by fermentation using molasses as main material that generates large quantity of wastewater. This wastewater contains high levels of colour and chemical oxygen demand (COD), that may causes serious environmental pollution. Most available treatment processes in Vietnam rely on biological methods, which often fail to treat waste water up to discharge standard. As always, it was reported that quality of treated wastewater could not meet Vietnameses discharge standard. So, it is necessary to improve the treatment efficiency of whole technological process and therefore, supplemental physico-chemical treatment step before biodegradation stage should be the appropriate choice. This study was carried out to assess the effect of coagulation process on decolourization and COD removal in molasses-based ethanol production wastewater using inorganic coaglutant under laboratory conditions. The experimental results showed that the reductions of COD and colour with the utilization of Al2(SO4)3 at pH 9.5 were 83% and 70%, respectively. Mixture FeSO4 – Al2(SO4)3 at pH 8.5 reduced 82% of colour and 70% of COD. With the addition of Polyacrylamide (PAM), the reduction efficiencies of colour, COD and turbidity by FeSO4 – Al2(SO4)3 were 87%, 73.1% and 94.1% correspondingly. It was indicated that PAM significantly reduced the turbidity of wastewater, however it virtually did not increase the efficiencies of colour and COD reduction. Furthermore, the coagulation processes using PAM usually produces a mount of sludge which is hard to be deposited.

Reflecting the Sky in Water

2017 ◽  
Vol 3 (1) ◽  
pp. 112-126 ◽  
Author(s):  
Ilaria Cristofaro
Keyword(s):  
The Unconscious ◽  
Related Case ◽  
Quality Of Water ◽  
Fluid Properties ◽  
Phenomenological Perspective ◽  
Auto Ethnography ◽  
The Individual ◽  
Artificial Water ◽  
Land Water

From a phenomenological perspective, the reflective quality of water has a visually dramatic impact, especially when combined with the light of celestial phenomena. However, the possible presence of water as a means for reflecting the sky is often undervalued when interpreting archaeoastronomical sites. From artificial water spaces, such as ditches, huacas and wells to natural ones such as rivers, lakes and puddles, water spaces add a layer of interacting reflections to landscapes. In the cosmological understanding of skyscapes and waterscapes, a cross-cultural metaphorical association between water spaces and the underworld is often revealed. In this research, water-skyscapes are explored through the practice of auto-ethnography and reflexive phenomenology. The mirroring of the sky in water opens up themes such as the continuity, delimitation and manipulation of sky phenomena on land: water spaces act as a continuation of the sky on earth; depending on water spaces’ spatial extension, selected celestial phenomena can be periodically reflected within architectures, so as to make the heavenly dimension easily accessible and a possible object of manipulation. Water-skyscapes appear as specular worlds, where water spaces are assumed to be doorways to the inner reality of the unconscious. The fluid properties of water have the visual effect of dissipating borders, of merging shapes, and, therefore, of dissolving identities; in the inner landscape, this process may represent symbolic death experiences and rituals of initiation, where the annihilation of the individual allows the creative process of a new life cycle. These contextually generalisable results aim to inspire new perspectives on sky-and-water related case studies and give value to the practice of reflexive phenomenology as crucial method of research.

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