scholarly journals Phosphorus and organic matter removal from synthetic wastewater using alum and aluminum hydroxide

2013 ◽  
Vol 8 (2) ◽  
pp. 121-130
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Acid Solution ◽  
Tannic Acid ◽  
Aluminium Hydroxide ◽  
Freundlich Isotherm ◽  
Synthetic Wastewater ◽  
Wastewater Treatment Process ◽  
Ph Values ◽  
Tannic Acid Solution

At present, chemical processes are widely used to remove phosphorus and organic matter from water or wastewater either as the only advanced treatment method or as a pre-treatment stage to biological treatment, and aluminium salts have been traditionally used as coagulants. In the present study removal of orthophosphate or dissolved organic matter with the use of two aluminium sources: alum [Al2(SO4)3•18H2O] and aluminium hydroxide [Al(OH)3(s)] is examined for the wastewater treatment process. Amorphous aluminium hydroxide was chosen because it is the hydrolyzed (olated) product of alum and an important adsorbent of inorganic and organic substances in soils since bayerite, gibbsite and boehmite contain a large portion of aluminium hydroxides. Laboratory jar test studies were carried out using either an orthophosphate solution (10 mg l-1) or a tannic acid solution (50 mgC l-1) as simulated wastewater and the effect of parameters such as coagulant dose (up to 15 mg Al l-1 in the case of alum and up to 90 mg Al l-1 in the case of Al(OH)3) and pH (2-12) is investigated. The values of these parameters were based upon measurements on municipal wastewaters from the input of the primary treatment of a wastewater plant in Athens. Orthophosphates have been chosen as a P surrogate as they are the major portion of the total P found in wastewater and tannic acid solution was used as a surrogate for soluble organic matter. It was proven that alum is much more efficient in phosphorus and tannic acid removal than aluminium hydroxide. The optimal pH values are 5-6 in both cases, alum and aluminium hydroxide, although alum is efficient in a wider pH range (4-7) and a mechanism was proposed to interpret these results. In pH values less than 6 the mechanism proposed was chemical bonding between Al species and tannic acid or phosphates creating insoluble complexes while in bigger pH values (6-8) adsorption on solid Al(OH)3. Freundlich isotherm was proven to fit satisfactorily the experimental data for aluminium hydroxide and orthophosphate at 250C suggesting heterogeneous sorption, with KF and N values 49,1 and 0,19 respectively. The findings of this work may not only contribute to a better understanding of the chemistry of chemical wastewater treatment and therefore to an improvement of the process but also on phosphorus and organics fixation in soils that contain a large portion of aluminium hydroxides.

scholarly journals Insight into removals of PARAFAC components from dissolved and particulate organic matter in wastewater treatment process by two-dimensional correlation and structure equation modeling

2021 ◽  
Vol 33 (1) ◽  
Author(s):  
Benxin Yu ◽  
Dongping Liu ◽  
Jian Wang ◽  
Yingxue Sun
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Particulate Organic Matter ◽  
Structural Equation ◽  
Treatment Process ◽  
Treatment Plant ◽  
Equation Modeling ◽  
Two Dimensional ◽  
Wastewater Treatment Process ◽  
Insight Into

Abstract Background Most particulate organic matter (POM) cannot be directly degraded in the conventional wastewater treatment, which should be transformed into dissolved organic matter (DOM) through a hydrolysis process. However, non-hydrolyzed POM in the biological treatment can limit treated efficiencies for the wastewater treatment plants (WWTPs) facilities. Hence an operational tool is indispensable for insight into removals of DOM and POM factions in the WWTP. In this study, excitation-emission matrix fluorescence spectroscopy (EEM) combined parallel factor analysis (PARAFAC), two-dimensional correlation (2D-COS) and structural equation modeling (SEM) was employed to evaluate removals of DOM and POM in a wastewater treatment plant. Results Four fluorescence components were identified in DOM and POM substances from the WWTP by EEM combined with PARAFAC, i.e., tyrosine-like (TYLF), tryptophan-like (TRLF), microbial byproduct-like (MBLF), and fulvic acid-like (FALF). In A2/O process, the TYLF and TRLF of DOM were removed to a larger extent than those of MBLF and FALF in anaerobic tank, while TYLF and MBLF of POM were removed to a great extent than those of TRLF and FALF in primary sedimentation and aerobic tanks. By the 2D-COS, a decreasing variation order of DOM fractions in the wastewater treatment process was UV-FALF → MBLF2 → Vis-FALF → TRLF → TYLF, while the decreasing order of POM fractions was Vis-FALF → UV-FALF → MBLF2 → TYLF → MBLF1 → TRLF. SEM revealed that TRLF and TYLF of DOM were degraded by anaerobic microorganism, and TRLF could be transformed partially into FALF. However, TRFL and TYLF of POM were discomposed by aerobic microorganism. Conclusions The 2D-COS and SEM can be practicable tools as EEM-PARAFAC for monitoring DOM and POM in the WWTP. The study could present a theoretical support to improving the retrofit of WWTP and formulating emission standards for organic pollutants.

scholarly journals Examining the Effects of the Runoff Originating From Biosolids Amended Soil Plots on the Biogeochemical Nitrogen Cycle and Eutrophication

2021 ◽  
Author(s):  
Denis Matiichine
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Organic Nitrogen ◽  
Treatment Process ◽  
Organic Fertilizer ◽  
Agricultural Runoff ◽  
Water Systems ◽  
Agricultural Fields ◽  
Wastewater Treatment Process ◽  
Significant Difference

One of the disposal methods for biosolids (nutrient rich organic matter that settles out of the wastewater during wastewater treatment process) is through application on agricultural fields as organic fertilizer. In order to determine the effects of runoff originating from biosolids treated fields on the nitrogen biogeochemical cycle and eutrophication of surface water, a lab-scale mesocosm experiment was carried out, simulating agricultural fields and thermally stratified water systems receiving agricultural runoff. A significant difference was found between the effects of the runoff from unfertilized soil plots and plots fertilized with biosolids. The findings indicate that the majority of incoming nitrogen is either denitrifed, lost to the sediment or is accumulated in the water column as nitrate. Further, it is hypothesised that the majority of incoming organic nitrogen was rapidly mineralized to ammonium in the hypolimnion, which has the potential to increase nitrogen bioavailability to primary producers in the epilimnion.

scholarly journals Coke oven wastewater treatment by two activated sludge systems

2013 ◽  
Vol 8 (1) ◽  
pp. 16-22
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nutrient Removal ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Coke Oven ◽  
Synthetic Wastewater ◽  
Removal Efficiencies ◽  
Activated Sludge Systems

In this study two bench scale activated sludge systems were used, a CSTR and an SBR for the treatment of coke – oven wastewater. Both reactors were inoculated with activated sludge from a municipal wastewater treatment plant. At the first stages of operation, reactors were feed by a mixture of municipal wastewater and synthetic wastewater. Full acclimatization of the microorganisms to synthetic wastewater was achieved in 60 days. The operation of the reactors was divided into three distinct periods. The first period was characterized by the treatment of high organic but non-toxic synthetic wastewater. During this period COD and BOD5 removal efficiencies reached 95 and 98% respectively, in both reactors. Nutrient removal was better in the SBR reactor rather than in the CSTR. In the second period phenol was added in concentrations up to 300 mg l-1. Degradation of phenol started about the 20th day after its introduction to the reactors. In this period no effects of phenol to nutrient removal were observed, whereas the removal efficiency of organic matter in both reactors was slightly decreased. During the third period phenol concentrations of the influent were gradually increased to 1000 mg l-1, while cyanide and thiocyanite were added to the influent composition to concentrations reaching concentrations of 20 and 250 mg l-1 respectively. The composition of the influent of this period was a full assimilation of coke oven wastewater. Introduction of increased phenol concentrations along with cyanide compounds initiated irreversible effects on the activated sludge microfauna of the CSTR causing inherent problems to the treatment process, while SBR showed greater capacity to withstand and degrade toxic compounds. The beginning of this period was characterized by decreased settleability of the suspended solids as well as decrease of organic matter and nutrient removal efficiencies. Monitoring of the effluent characteristics during this period reported over 90% for organic load, 85% of nutrient removal and over 90% of phenol and cyanide removal in SBR, while the removal efficiencies for the CSTR were 75, 65 and 80% respectively.

Effects of UV Radiation and pH of Tannic Acid Solution in the Synthesis of Silver Nanoparticles

2014 ◽  
Vol 911 ◽  
pp. 110-114
Author(s):  
Kanitta Watcharaporn ◽  
Mantana Opaprakasit ◽  
Vimolvan Pimpan
Keyword(s):  
Silver Nanoparticles ◽  
Acid Solution ◽  
Uv Radiation ◽  
Tannic Acid ◽  
Suitable Condition ◽  
Scattering Method ◽  
Dynamic Light Scattering Method ◽  
Transmission Electron ◽  
Uv Visible ◽  
Tannic Acid Solution

The reductions of silver nitrate by tannic acid at various pH with and without UV radiation at room temperature were done in order to study the effects of UV radiation and pH of tannic acid solution in the synthesis of silver nanoparticles. The results from UV-Visible spectroscopy, dynamic light scattering method and transmission electron microscopy indicated that using UV radiation resulted in silver nanoparticles with smaller particles and narrower size distribution at every pH. The results also revealed that smallest particles without agglomeration were obtained when alkali condition was applied. Therefore, the suitable condition for synthesizing silver nanoparticles in this research was to use UV radiation and tannic acid solution having pH of 8.0.

scholarly journals Water treatment by H2O2 and/or UV affects carbon nanotube (CNT) properties and fate in water and tannic acid solution

2015 ◽  
Vol 22 (24) ◽  
pp. 20198-20206 ◽  
Author(s):  
Bożena Czech ◽  
Patryk Oleszczuk ◽  
Agnieszka Ewa Wiącek ◽  
Mariusz Barczak
Keyword(s):  
Carbon Nanotube ◽  
Water Treatment ◽  
Acid Solution ◽  
Tannic Acid ◽  
Tannic Acid Solution

scholarly journals Indigenous Lipase Producing Bacteria for Lipid-rich Wastewater Treatment

2022 ◽  
Vol 31 (2) ◽  
pp. 135-142
Author(s):  
Lovely Aktar ◽  
Mohammad Moniruzzaman ◽  
Yasuzo Sakai ◽  
Mihir Lal Saha
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Organic Matter ◽  
Wastewater Treatment ◽  
Bacillus Subtilis ◽  
Plant Tissue ◽  
Stenotrophomonas Maltophilia ◽  
Treatment Plant ◽  
Cod Removal ◽  
Synthetic Wastewater ◽  
Removal Efficiencies

This study was undertaken to evaluate the removal of lipid-rich organic matter from wastewater by lipase producing bacteria. Ten potential lipase producing bacteria were isolated from lipid-rich environments in and around Dhaka Metropolitan city. Three of them produced lipase higher than 10 U/ml. These three isolates and their consortium were used for synthetic wastewater treatment in the laboratory. The initial COD value of synthetic wastewater was 1,200 mg/l. COD removal efficiencies in the synthetic wastewater were 74.75, 73.33 and 66.67% by the Stenotrophomonas maltophilia e-a22, Pseudomonas aeruginosa 12 and Bacillus subtilis 20B, respectively. Stenotrophomonas maltophilia showed better COD removal performance (74.75%) in case of monoculture. But consortium showed better COD removal (83.33%) than that of monoculture. Therefore, it could be concluded that consortium of three isolates will be more useful for wastewater treatment as seed cultures in the wastewater treatment plant associated with the lipid-rich wastewater. Plant Tissue Cult. & Biotech. 31(2): 135-142, 2021 (December)

scholarly journals Tannic Acid Solution: A Better Fixative Solution Than Formalin for Elastin and Collagen-Toxic and Morphological Assessment

2018 ◽  
Vol 301 (9) ◽  
pp. 1544-1550 ◽  
Author(s):  
Rafael Cisne ◽  
Alessandra M. T. Souza ◽  
Marco A. Pereira-Sampaio ◽  
Marcio A. Babinski ◽  
Silvana L. Gorniak ◽  
...  
Keyword(s):  
Acid Solution ◽  
Tannic Acid ◽  
Morphological Assessment ◽  
Tannic Acid Solution

Excess sludge reduction in activated sludge processes by integrating biomass alkaline heat treatment

2001 ◽  
Vol 44 (2-3) ◽  
pp. 437-444 ◽  
Author(s):  
M. Rocher ◽  
G. Roux ◽  
G. Goma ◽  
A. Pilas Begue ◽  
L. Louvel ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Waste Treatment ◽  
Ralstonia Eutropha ◽  
Synthetic Wastewater ◽  
Waste Activated Sludge ◽  
Excess Sludge ◽  
Wastewater Treatment Process ◽  
Activated Sludge Processes

With new EC regulations, alternative treatment and disposal techniques of the excess sludge produced by activated sludge wastewater treatment plants have to be developed. To decrease activated sludge production yield, microbial cell lysis can be amplified to enhance cryptic growth (biomass growth on lysates). Cell breakage techniques (thermal, alkaline and a combination) were studied to generate Ralstonia eutropha (strain model) and waste activated sludge lysates and to evaluate their biodegradability. Gentle treatment conditions by alkaline waste treatment (20 min at 60°C and pH 10 by NaOH addition) allowed waste activated sludge to be solubilized by a two step process (instantaneous and post-treatment) giving a dissolved organic carbon released by the total suspended solids treated of 267 mgDOC.g-1TSS. The biodegradation of the soluble fraction of the lysates by fresh sludge reached 75 and 90% after 48 and 350 hrs of incubation respectively. A validation on a laboratory scale by insertion of a liquor alkaline heat treatment loop in a biological synthetic wastewater treatment process was carried out. A reduction of 37% of the excess sludge was obtained without altering the purification yield of the process.

A study on the effects of ozone dosage on dissolved-ozone flotation (DOF) process performance

2015 ◽  
Vol 71 (9) ◽  
pp. 1423-1428 ◽  
Author(s):  
Xin Jin ◽  
Pengkang Jin ◽  
Xiaochang Wang
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Process ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Secondary Effluent ◽  
Process Performance ◽  
Wastewater Treatment Process ◽  
Organic Matter Removal

Dissolved-ozone flotation (DOF) is a tertiary wastewater treatment process, which combines ozonation and flotation. In this paper, a pilot-scale DOF system fed by secondary effluent from a wastewater treatment plant (WWTP) in China was used to study the effect of ozone dosage on the DOF process performance. The results show that an ozone dosage could affect the DOF performance to a large extent in terms of color and organic matter removal as well as disinfection performance. The optimal color and organic matter removal was achieved at an ozone dosage of 0.8 mg/l. For disinfection, significant improvement in performance could be achieved only when the organic matter removal was optimal. The optimal ozone dosage of at least 1.6 mg/l was put forward, in this case, in order to achieve the optimal color, turbidity, organic matter and disinfection performance.

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