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).

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.

scholarly journals Phosphorus dynamics in a subtropical coastal lake in Southern Brazil

2019 ◽  
Vol 79 (1) ◽  
Author(s):  
Aurea L. Lemes da Silva ◽  
Mariana C. Hennemann ◽  
Mauricio M. Petrucio
Keyword(s):  
Organic Matter Content ◽  
Benthic Fauna ◽  
Size Composition ◽  
Matter Content ◽  
Functional Feeding Groups ◽  
Coastal Lake ◽  
Chl A ◽  
Significant Relationships ◽  
P Concentration ◽  
Total P

Temporal and spatial variations of organic and inorganic forms of phosphorus in the sediments of a subtropical oligo-mesotrophic shallow lake were investigated in relation to water column parameters, sediment characteristics and benthic fauna. The main results found were: 1) Phosphorus (P)  concentration varied seasonally, with organic P and total P  increasing in the sediments in warmer periods; 2) Sediment spatial variation, in terms of grain size composition and organic matter content, influenced P concentrations; 3) quantities and qualities of P in the sediments were positively correlated with water parameters, especially DO and NO3, Chl-a,  water temperature, pH, and total P. Negative correlations were observed between %OP and DO in sites 1, 3 and 4, and with NO3 in sites 2, 3 and 4; 4) benthic functional feeding groups showed significant relationships with temporal variation in sediment P concentration, including gathering-collectors, shredders, filterers and filtering-collectors. The results suggest a high importance of temperature mediated control of sediment-P release, both directly, through its direct effects on primary production and decomposition rates, and indirectly through its effects on other water and sediment parameters, especially dissolved oxygen concentration.

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.

scholarly journals Effect of the Degree of Soil Contamination with Heavy Metals on Their Mobility in the Soil Profile in a Microplot Experiment

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 878
Author(s):  
Dorota Pikuła ◽  
Wojciech Stępień
Keyword(s):  
Heavy Metals ◽  
Soil Contamination ◽  
Soil Profile ◽  
Contaminated Soils ◽  
Soil Depth ◽  
Organic Matter Content ◽  
Size Composition ◽  
Matter Content ◽  
Pollution Level ◽  
Lead And Cadmium

Adjusting Polish law to EU standards, many studies were started in the 1990s on the harmfulness of presumably contaminating elements (PCE) to the environment and the quality of plants intended produced for food purposes. For this reason, in 1987, a unique microplate experiment was established on natural soils artificially contaminated with copper, zinc, lead and cadmium oxides (up to the pollution level of class I, II and III). The soils were diversified in terms of pH (through liming), organic matter content (through the addition of brown coal) and the grain size composition of the humus level (Ap) (strong clay sand and light silt clay). After 14 years from the introduction of different rates of metals into the top layer (0–30 cm) of the two soils studied, relatively large movement of heavy metals in the soil profile occurred. The amount of leached metals depended mainly on the rate of a given element. The more contaminated was the soil was, the heavier the metals that leached to lower genetic levels of soil. Contaminated soils always had a higher concentration of individual metals in Et than in Bt level. The content of the tested metals in the Et layer was determined in HCl (1 mol·dm−3) and compared to the humus level. Only at the soil depth below 50 cm (Bt), the content of the studied metals’ forms was much lower than in the surface levels. The calculated mobility coefficients of the tested metals determined in 1 M HCl indicate a larger movement of the tested metals in lighter soils than in medium soils. The highest displacement coefficients were obtained for cadmium, while the lowest were for lead. An increase in mobility was obtained alongside an increase in soil contamination with the heavy metals studied. By analyzing the mobility coefficients (heavy metal increase in the Bt and Et layers), they can be ranked in the following decreasing sequence: on light soils: Cd > Cu > Zn > Pb and on medium soils: Cd > Zn > Pb > Cu.

scholarly journals Pengolahan Nitrifikasi Limbah Amonia dan Denitrifikasi Limbah Fosfat dengan Biofilter Tercelup

2019 ◽  
Vol 20 (2) ◽  
pp. 243
Author(s):  
Arysca Wisnu Satria ◽  
Merza Rahmawati ◽  
Agus Prasetya
Keyword(s):  
Waste Treatment ◽  
Reduction Rate ◽  
Treatment Plant ◽  
Ammonia Removal ◽  
Phosphate Removal ◽  
Operational Parameters ◽  
Substrate Removal ◽  
Substrate Reduction ◽  
Denitrification Reactor ◽  
Waste Treatment Plant

ABSTRACTWater pollution is a problem that often arises and gives a serious impact to the environment. Therefore, it should be reduced by conventional methods or modern methods. The submerged biofilter is a biological waste treatment plant that utilizing microorganisms grown in a packing medium. The advantages of submerged biofilter as a waste treatment plant are easy to use and low energy consumption so the operational cost is cheaper. This study aims to determine the operational parameters of the submerged biofilter and to develop a model that can be used to estimate the rate of elimination of each pollutant using nitrification reactor for ammonia and denitrification reactor for phosphate. The experiments were conducted with draining the wastewater in a cylindrical bio-filter column in which the hight is 90 cm. At first, the microorganism was grown for two weeks with the residence time of one day. Furthermore, the wastewater removals are conducted with hydraulic loading rate (HLR) variation of 0.44; 0.55; 0.74; 1.11; 1.66; 2.21; and 3.32 m3/m2/day. Then the effluent from the outlet is analyzed using UV-Vis Spectrophotometer. The results showed that the optimum ammonia and phosphate removal was obtained in 0.44 m3/m2/day for ammonia removal and 1.66 m3/m2/day for phosphate removal. While the removal of ammonia and phosphate percentage from both conditions are 97.41% and 27.16% respectively. The changes of HLR will give an effect on substrate reduction rate (SRR), and the percentage of substrate removal. The model developed based on efficiency factors presented a good approach to represent the concentration of substrate effluent at various HLR. Keywords: wasteswater, nitrification, denitrification, submerged biofilter ABSTRAKPencemaran air merupakan permasalahan yang sering muncul dan berpengaruh serius pada lingkungan. Oleh karena itu, perlu dilakukan usaha yang berkelanjutan untuk dapat mengurangi dampak dari pencemaran tersebut, baik dengan cara-cara konvensional maupun inovasi teknologi terbaru. Biofilter tercelup (submerged biofilter) adalah suatu alat pengolah limbah secara biologi dengan memanfaatkan mikroorganisme yang ditumbuhkan dalam media packing di dalamnya. Kelebihan penggunaan biofilter tercelup sebagai alat pengolah air limbah adalah pengelolaannya yang mudah dan konsumsi energi yang rendah sehingga biaya operasionalnya murah. Penelitian ini bertujuan untuk mengetahui parameter operasional biofilter tercelup dan mengembangkan model untuk memperkirakan laju penyisihan setiap polutan menggunakan reaktor nitrifikasi untuk limbah amonia dan reaktor denitrifikasi untuk fosfat. Percobaan dilakukan dengan mengalirkan limbah pada sebuah kolom biofilter berbentuk silinder dengan ketinggian 90 cm. Pada mulanya mikroorganisme ditumbuhkan dengan mengalirkan limbah selama dua minggu dengan waktu tinggal cairan satu hari. Selanjutnya dilakukan penyisihan limbah dengan variasi kecepatan beban hidrolik (HLR) sebesar 0,44; 0,55; 0,74; 1,11; 1,66; 2,21; dan 3,32 m3/m2/hari. Effluent dari keluaran reaktor kemudian dianalisis menggunakan Spektrofotometer UV-Vis. Hasil penelitian menunjukkan bahwa kondisi optimum penyisihan amonia dan fosfat adalah 0,44 m3/m2/hari untuk penyisihan amonia dan 1,66 m3/m2/hari untuk penyisihan fosfat. Persentase removal amonia dan fosfat dari kedua kondisi tersebut berturut-turut sebesar 97,41% dan 27,16%. Perubahan HLR berpengaruh terhadap kecepatan penyisihan limbah (SRR), dan persentase limbah tersisihkan. Model yang dikembangkan berdasarkan faktor efisiensi memberikan hasil yang cukup baik untuk merepresentasikan besarnya konsentrasi effluent limbah pada berbagai variasi HLRKata kunci: limbah cair, nitrikasi, denitrifikasi, biofilter tercelup 

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.

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 Sediment and Nutrient Retention in Ponds on an Agricultural Stream: Evaluating Effectiveness for Diffuse Pollution Mitigation

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1640
Author(s):  
John Robotham ◽  
Gareth Old ◽  
Ponnambalam Rameshwaran ◽  
David Sear ◽  
David Gasca-Tucker ◽  
...  
Keyword(s):  
Suspended Solids ◽  
Stream Water ◽  
Organic Matter Content ◽  
Soluble Reactive Phosphorus ◽  
Nutrient Retention ◽  
Size Composition ◽  
Matter Content ◽  
Storm Events ◽  
Stream Water Quality ◽  
On Line

The creation of ponds and wetlands has the potential to alleviate stream water quality impairment in catchments affected by diffuse agricultural pollution. Understanding the hydrological and biogeochemical functioning of these features is important in determining their effectiveness at mitigating pollution. This study investigated sediment and nutrient retention in three connected (on-line) ponds on a lowland headwater stream by sampling inflowing and outflowing concentrations during base and storm flows. Sediment trapping devices were used to quantify sediment and phosphorus accumulations within ponds over approximately monthly periods. The organic matter content and particle size composition of accumulated sediment were also measured. The ponds retained dissolved nitrate, soluble reactive phosphorus and suspended solids during baseflows. During small to moderate storm events, some ponds were able to reduce peak concentrations and loads of suspended solids and phosphorus; however, during large magnitude events, resuspension of deposited sediment resulted in net loss. Ponds filtered out larger particles most effectively. Between August 2019 and March 2020, the ponds accumulated 0.306 t ha−1 sediment from the 30 ha contributing area. During this period, total sediment accumulations in ponds were estimated to equal 7.6% of the suspended flux leaving the 340 ha catchment downstream. This study demonstrates the complexity of pollutant retention dynamics in on-line ponds and highlights how their effectiveness can be influenced by the timing and magnitude of events.

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