Improvement of Active Biological Sludge Quality for Anaerobic Digestion Phase in the Wastewater Treatment Plant by Ultrasonic Pretreatment

2018 ◽  
Vol 69 (1) ◽  
pp. 31-33
Author(s):  
Mihai Stefanescu ◽  
Gheorghe Nechifor ◽  
Costel Bumbac ◽  
Ioana Ionescu ◽  
Olga Tiron
Keyword(s):  
Reaction Time ◽  
Ultrasonic Treatment ◽  
Organic Matter Content ◽  
Treatment Plant ◽  
Cooling Water ◽  
Matter Content ◽  
Ultrasonic Waves ◽  
Operating Conditions ◽  
Biological Sludge ◽  
Ultrasound Energy

This paper emphasized the influence of the main operating parameters of ultrasonic biological sludge pretreatment onto disintegration (DD-COD) and solubilizing degree of organic matter content. The optimal ultrasonic reaction time, energy and amplitude of ultrasonic waves and pH of the sludge (non-modified pH and pH 8.5) were established taking into account their influence on the solubility level of COD, an evolution of particles size. Correlations between disintegration degree and dimensional analysis were performed. Ultrasonic reactor operating to 20 kHz ultrasound frequency was a close system having cooling water jacket. Experimental tests in different operating conditions (reaction time 5 � 60 min., ultrasound energy 2000 � 9000 kJ, pH = 6.5/8.5) demonstrated that alkaline ultrasonic treatment (pH = 8.5, initial homogeneous COD = 72600 mg O2/L) at medium - high ultrasound energy levels led to highest disintegration degree � DD 12% (comparing with pH = 6.5 � DD ~ 5%). Still, the process should be managed carefully because of possibility to have important variation of DD during the ultrasonic treatment.

scholarly journals Sludge Treatment for Application in Agriculture Should be the Option Number One for Ukraine

2017 ◽  
pp. 356-362
Author(s):  
Lidiia Svirenko ◽  
Viktoriia Bondar
Keyword(s):  
Organic Matter ◽  
Sewage Sludge ◽  
Organic Fertilizer ◽  
Organic Matter Content ◽  
Treatment Plant ◽  
Matter Content ◽  
Biofuel Production ◽  
National Standard ◽  
Arable Soils ◽  
Climatic Zones

Ukraine is well-known in the world as a country with soil rich for humus. Approximately 68% of arable soils in Ukraine have been classificated as chernozem. For last decades decrease of organic matter content in soils of various agri-climatic zones has been surveyed in the country. The main reason of the mentioned process is enormous lack of organic fertilizer (manure) in agriculture connected with decrease in livestock (in 3 times since year 1992). Besides there is expansion of technical crops for biofuel production (like Brassica napus, Helianthus annuus), which are the provocateurs of soils exhaustion. At the same time such important source of organic matter for application in agriculture as sewage sludge (SS) from wastewater treatment plant (WWTP) is not used in Ukraine nowadays. To stop arable soils degradation in regions it is necessary to develop up-to-date management for fertilizer production on WWTPs. The base for the process has to be the acceptance of the goal-oriented National programme, corresponding governmental decrees and implementation of national standard for using sewage sludge as fertilizer.

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.

Reclaimed wastewater quality enhancement by oxygen injection during transportation

2011 ◽  
Vol 63 (4) ◽  
pp. 641-648 ◽  
Author(s):  
L. E. Rodríguez-Gómez ◽  
M. Álvarez ◽  
J. Rodríguez-Sevilla ◽  
M. C. Marrero ◽  
A. Hernández
Keyword(s):  
Organic Matter ◽  
Water Reuse ◽  
Wastewater Reuse ◽  
Organic Matter Content ◽  
Treatment Plant ◽  
Matter Content ◽  
Injection System ◽  
Nitrite Accumulation ◽  
Reclaimed Wastewater ◽  
Oxygen Injection

In-sewer treatments have been studied in sewer systems, but few have been carried out on reclaimed wastewater systems. A study of oxygen injection has been performed in a completely filled gravity pipe, 0.6 m in diameter and 62 km long, in cast iron with concrete inside coating, which is part of the reclaimed wastewater reuse scheme of Tenerife (Spain). A high pressure oxygen injection system was installed at 16.0 km from pipe inlet and a constant dosage of 30 mg/L O2 has been injected during six months, under three different operational modes (low COD, 63 mg/L; high COD, 91 mg/L; and partially nitrified water). Oxygen has been consumed in nitrification and organic matter reduction. Generally, nitrification is clearly favored instead of the organic matter oxidation. Nitrification occurs, in general, with nitrite accumulation due to the presence of free ammonia above 1 mg/L. Denitrification is in all cases incomplete due to a limitation of easily biodegradable organic matter content, inhibiting the appearance of anaerobic conditions and sulfide generation. A notable reduction of organic matter parameters is achieved (TSS below 10 mg/L), which is significantly higher than that observed under the ordinary transport conditions without oxygen. This leads to a final cost reduction, and the oxygen injection system helps water reuse managers to maintain a final good water quality in the case of a treatment plant malfunction.

Advanced treatment of high strength opium alkaloid industry effluents

2002 ◽  
Vol 46 (9) ◽  
pp. 323-330 ◽  
Author(s):  
A.F. Aydin ◽  
M. Altinbas ◽  
M.F. Sevimli ◽  
I. Ozturk ◽  
H.Z. Sarikaya
Keyword(s):  
Reaction Time ◽  
Treatment Plant ◽  
Operating Conditions ◽  
Treatment System ◽  
Molar Ratio ◽  
Optimum Operating ◽  
Second Phase ◽  
Fenton’S Oxidation ◽  
Fenton's Oxidation ◽  
Opium Alkaloid

The purpose of this study was to investigate an effective treatment system which can be applicable to treat opium alkaloid industry (OAI) effluents characterised with high COD, TKN, dark color and non-biodegradable organic pollutants. In the first phase of the study, lab-scale anaerobic (UASBR) + aerobic (SBR) treatability studies were carried out on opium processing industry effluents. Effluent CODs from the two staged biological treatment system were relatively high (∼700 mgl−1) and additional post treatment was required. Physico-chemical treatability studies previously carried out on the effluent of opium alkaloid wastewater treatment plant, were not effective in removing residual COD and color. In the second phase of the study, the refractory organics causing higher inert COD values in the SBR effluent were additionally treated by using Fenton's Oxidation. The batch tests were performed to determine the optimum operating conditions including pH, H2O2 dosage, molar ratio of Fe2+/H2O2 and reaction time. It was found that removal efficiencies of COD and color for 30 minutes reaction time were about 90% and 95%, respectively. The ratio of H2O2/FeSO4 was determined as 200 mgl−1/600 mgl−1 for the optimum oxidation and coagulation process at pH 4. Experimental results of the present study have clearly indicated that the Fenton's oxidation technology is capable to treat almost all parts of the organics which consist of both soluble initial and microbial inert fractions of COD for opium alkaloid industry effluents. Effluents from the Fenton's Oxidation process can satisfy effluent standards for COD and color in general.

scholarly journals Chemical properties of soils treated with biological sludge from gelatin industry

2012 ◽  
Vol 36 (2) ◽  
pp. 653-660 ◽  
Author(s):  
Rita de Cássia Melo Guimarães ◽  
Mara Cristina Pessôa da Cruz ◽  
Manoel Evaristo Ferreira ◽  
Carlos Alberto Kenji Taniguchi
Keyword(s):  
Organic Matter Content ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Matter Content ◽  
P Availability ◽  
Base Content ◽  
Biological Sludge ◽  
Randomized Design ◽  
Chemical Properties Of Soils ◽  
The Impact

The impact of agro-industrial organic wastes in the environment can be reduced when used in agriculture. From the standpoint of soil fertility, residue applications can increase the organic matter content and provide nutrients for plants. This study evaluated the effect of biological sludge from gelatin industry on the chemical properties of two Ultisols (loamy sand and sandy clay) and an Oxisol (clay). The experiment lasted 120 days and was carried out in laboratory in a completely randomized design with factorial arrangement, combining the three soils and six biological sludge rates (0, 100, 200, 300, 400, and 500 m³ ha-1), with three replications. Biological sludge rates of up to 500 m³ ha-1 decreased soil acidity and increased the effective cation exchange capacity (CEC) and N, Ca, Mg, and P availability, without exceeding the tolerance limit for Na. The increase in exchangeable base content, greater than the effective CEC, indicates that the major part of cations added by the sludge remains in solution and can be lost by leaching.

Comparison of the A²/O and Reversed A²/O Process at Low Organic Loading in Wuhan Shahu WWTP and the Optimized Program

2013 ◽  
Vol 781-784 ◽  
pp. 2003-2008
Author(s):  
Xun Wang ◽  
Lei Zhang
Keyword(s):  
Municipal Wastewater ◽  
Operation Mode ◽  
Organic Matter Content ◽  
Treatment Plant ◽  
Optimal Operation ◽  
Matter Content ◽  
Municipal Wastewater Treatment ◽  
Actual Operation ◽  
Practical Effect ◽  
Design Value

Based on the actual operation of Wuhan Shanhu WWTP, and combined with the actual feature of A2/O process and reversed A2/O process, this text analyzed the practical effect of which the CODcr is only 48% of the design value and the sludge load is 15.2% of the design value, and the reason for the aged-sludge and the high effluent value of NH3-N, proposed corresponding adjustment and optimized operation program. The result of optimal operation mode shows that the biodegradable organic matter content in activated sludge increases from 49% to 78%. The effluent quality is superior to the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). The electric consumption saves 0.09kWh/m.

scholarly journals Assessment of the Efficiency of Biological Treatment of Gases from Municipal Waste Processing

2019 ◽  
Vol 26 (4) ◽  
pp. 687-696
Author(s):  
Piotr Manczarski ◽  
Krystyna Lelicińska-Serafin ◽  
Anna Rolewicz-Kalińska
Keyword(s):  
Waste Treatment ◽  
Organic Matter Content ◽  
Treatment Plant ◽  
Size Composition ◽  
Matter Content ◽  
Equivalent Diameter ◽  
Surface Load ◽  
Filling Material ◽  
Operational Parameters ◽  
Permeable Membrane

Abstract The objective of the study is research on a biofilter existing at a mechanical-biological waste treatment plant in Radom. The paper presents results of research on the filling of the analysed biofilter (moisture, organic matter content, nutrient content, pH, grain size composition, and equivalent diameter), process gases (temperature, humidity and pH, concentrations of the main pollutants - ammonia, hydrogen sulphide, volatile organic compounds, acetic acid, ethanol) and operational parameters (flow rate, height of the biofilter layer, surface load, gas residence time in the filter bed). Irregularities were observed related to biofiltration efficiency, particularly resulting from improperly selected filling material and improper biofilter operation. The technological research permitted the identification of problems and determination of the requirement of performing necessary operational changes. Further works will involve the design, manufacture, and installation of an integrated biofilter with two-stage gas purification process (a classic biofilter and a semi-permeable membrane).

Determination of water supply sources in the Barcelona distribution system by UV spectrophotometry and PLS

2011 ◽  
Vol 11 (1) ◽  
pp. 45-54 ◽  
Author(s):  
S. Platikanov ◽  
V. Garcia ◽  
E. Landeros ◽  
R. Devesa ◽  
L. Matía ◽  
...  
Keyword(s):  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Tap Water ◽  
Organic Matter Content ◽  
Treatment Plant ◽  
Water Sources ◽  
Matter Content ◽  
Uv Spectrophotometry ◽  
Combined Use

A new method for the water source apportionment of the Barcelona (Spain) water distribution system is proposed. The method is based on the combined use of UV spectrophotometric measurements in the wavelength from 190–230 nm, and multivariate data analysis using the Partial Least Squares (PLS) chemometric method. From the differences in the organic matter content of the different water sources and of their corresponding UV spectral features, PLS was able to determine the relative amounts of the two main river water sources in samples of tap water from the different locations of the Barcelona city water distribution system. The extension of the method to determine the relative amounts in water blends, prepared from samples from five water treatment plant sources of the same city’s distribution system, required the combined use of some other parameters. In particular, the distinction and apportion of the water coming from a desalinisation plant could be successfully achieved once concentrations of Boron were included in the analysis.

scholarly journals Effect of coagulation and sonication on the dissolved air flotation (DAF) process for thickening of biological sludge in wastewater treatment

2020 ◽  
Vol 7 (1) ◽  
pp. 59-65 ◽  
Author(s):  
Ali Atamaleki ◽  
Mohammad Bagher Miranzadeh ◽  
Gholam Reza Mostafaii ◽  
Hosein Akbari ◽  
Leila Iranshahi ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Batch Reactor ◽  
Treatment Plant ◽  
Ultrasonic Waves ◽  
Maximum Efficiency ◽  
Dissolved Air Flotation ◽  
Biological Sludge ◽  
Dissolved Air

Background: Dissolved air floatation (DAF) is one of the methods has been used for the sludge thickening in wastewater treatment plants. This study aimed to investigate the effects of coagulation and sonication processes as additional configurations on the efficiency of a lab-scale DAF process for thickening of the biological sludge of an industrial wastewater treatment plant in Kashan, Iran. Methods: The required amounts of sludge samples were collected from a wastewater treatment plant and kept at temperature of 4°C. Variables, such as pressure (3, 5, and 7 atm), flotation time (5 and 10 minutes), ultrasonic irradiation power (0, 75, and 150 W), and presence/absence of Fe-based coagulant were considered on a sequencing batch reactor (SBR) included coagulation, flotation, and sonication processes, respectively. Results: The use of ultrasonic waves led to an insignificant increase in the DAF efficiency (P>0.05), however, the application of coagulant significantly increased the thickening efficiency (P<0.05). The maximum efficiency of the process was achieved at flotation time of 5 min, pressure of 3 atm, and sonication power of 75 W. Conclusion: According to the results, DAF has a proper efficiency for thickening of biological sludge. Coagulation compared to sonication has a greater effect on the efficiency of the process.

HEAVY METAL SPECIATION IN BOTTOM SEDIMENTS OF THE VYSHNEVOLOTSKY RESERVOIR

2018 ◽  
pp. 46-54
Author(s):  
O. A. Lipatnikova
Keyword(s):  
Heavy Metal ◽  
Organic Matter ◽  
Bottom Sediments ◽  
Metal Speciation ◽  
Organic Matter Content ◽  
Water Reservoir ◽  
Matter Content ◽  
Heavy Metal Speciation ◽  
Mobile Forms ◽  
Manganese Hydroxides

The study of heavy metal speciation in bottom sediments of the Vyshnevolotsky water reservoir is presented in this paper. Sequential selective procedure was used to determine the heavy metal speciation in bottom sediments and thermodynamic calculation — to determine ones in interstitial water. It has been shown that Mn are mainly presented in exchangeable and carbonate forms; for Fe, Zn, Pb и Co the forms are related to iron and manganese hydroxides is played an important role; and Cu and Ni are mainly associated with organic matter. In interstitial waters the main forms of heavy metal speciation are free ions for Zn, Ni, Co and Cd, carbonate complexes for Pb, fulvate complexes for Cu. Effects of particle size and organic matter content in sediments on distribution of mobile and potentially mobile forms of toxic elements have been revealed.

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