scholarly journals Solar homogeneous catalysis to the removal of organic matter from slaughterhouse effluents undergone to a prior biological process

2021 ◽  
Author(s):  
J. A. Hurtado ◽  
L. F. Valdez ◽  
C. J. Escudero
Keyword(s):  
Biological Treatment ◽  
Suspended Solids ◽  
Biological Process ◽  
Renewable Energy Sources ◽  
Quality Parameters ◽  
Fenton Process ◽  
Slight Improvement ◽  
Effluent Quality ◽  
Different Types ◽  
Treatment Train

Abstract This study shows the effectiveness of the wastewater treatment from a municipal slaughterhouse undergone to a previous biological treatment applying a sequence of stages, reaching a 75% of elimination of the COD using sedimentation in combination of coagulation-flocculation, using 0.5 g/L FeCl3 which is one of the best known inorganic coagulants. Then, the elimination of COD was around 98% adding the Fenton process where 1,000 mg/L H2O2 and FeSO4 are used. In addition to the COD, other water quality parameters were measured to evaluate the level of purification of the test samples, such as solids of different types, pH, DOC and so on. With the above, it can be noted that the Fenton process had a slight improvement in the effluent quality by using a solar concentrator in the now called photo-Fenton process, reaching around 99% of COD removal (0.36 g/L), 91% of total suspended solids (0.32 g/L) and 89% of DOC (0.20 g/L). These results were the best achieved within a proposed treatment train for this type of complex wastewater. Moreover, this last part of the process adds an improvement, by the usage of renewable energy sources such as sunlight.

Evaluation of Small Wastewater Treatment Plants in the County of Århus – Denmark

1993 ◽  
Vol 28 (10) ◽  
pp. 33-41
Author(s):  
Jes la Cour Jansen ◽  
Bodil Mose Pedersen ◽  
Erik Moldt
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetlands ◽  
Biological Treatment ◽  
Wastewater Treatment Plants ◽  
Chemical Precipitation ◽  
Common Type ◽  
Treatment Efficiency ◽  
Effluent Quality ◽  
Different Types

Influent and effluent data from about 120 small wastewater treatment plants (100 - 2000 PE) have been collected and processed. Seven different types of plants are represented. The effluent quality and the treatment efficiency have been evaluated. The most common type of plant is mechanical/biological treatment plants. Some of them are nitrifying and some are also extended for chemical precipitation of phosphorus. Constructed wetlands and biological sandfilters are also represented among the small wastewater treatment plants.

scholarly journals Indoor air in autonomous building

2018 ◽  
Vol 49 ◽  
pp. 00058
Author(s):  
Dorota Koruba ◽  
Jerzy Zbigniew Piotrowski ◽  
Robert Piekoszewski ◽  
Włodzimierz Grochal
Keyword(s):  
Indoor Air ◽  
Biological Treatment ◽  
Renewable Energy Sources ◽  
Treatment Plant ◽  
Carbon Dioxide Concentration ◽  
Quality Parameters ◽  
Building Management ◽  
Building Management System ◽  
Autonomous Objects ◽  
Object Parameters

The paper describes the use of renewable energy sources in an autonomous home in the aspect of sustainable development. The work contains an analysis of the results of the quality parameters of the internal microclimate (carbon dioxide concentration and relative humidity), mycological cleanliness of the enclosed spaces in the study was taken into account, the immediate proximity of the pond as a biological treatment plant, which is also an integral part of the ecosystem with a closed cycle of organic matter and influences independence energy of the tested object. Parameters of the microclimate were taken from the BMS (Building Management System) installed in the facility, while mycological purity tests were carried out using the sedimentation and collision method. Based on the conducted analyses, conclusions have been drawn that can be used in the design of autonomous objects.

Disturbances and Inhibition in Biological Treatment of Wastewater from an Integrated Refinery

1988 ◽  
Vol 20 (10) ◽  
pp. 21-29 ◽  
Author(s):  
N. Galil ◽  
M. Rebhun ◽  
Y. Brayer
Keyword(s):  
Pilot Plant ◽  
Biological Treatment ◽  
Suspended Solids ◽  
Biological Process ◽  
Oil Refinery ◽  
Process Rate ◽  
Inhibitory Effects ◽  
Dissolved Air Flotation ◽  
Mixed Liquor ◽  
Dissolved Air

Biological treatment of wastewater from an integrated oil refinery, containing hazardous contaminants, was studied in an on site pilot plant. The wastewater is pretreated by gravity separation, flocculation and dissolved air flotation. Biotreatment of such wastewaters poses several problems which have to be considered in planning, design and operation of the treatment system. The process rate is relatively slow, due to the inhibitory effects. The mixed liquor volatile suspended solids (MLVSS) could not be maintained at concentrations higher than 2000 mg/l. Sudden discharges of concentrated phenolic wastes disrupted the process first by impairing bioflocculation, followed by complete inhibition of the biological process.

Comparative study of MBR and activated sludge in the treatment of paper mill wastewater

2007 ◽  
Vol 55 (6) ◽  
pp. 23-29 ◽  
Author(s):  
M. Lerner ◽  
N. Stahl ◽  
N.I. Galil
Keyword(s):  
Activated Sludge ◽  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Paper Mill ◽  
Ammonia Nitrogen ◽  
Quality Parameters ◽  
Maintenance Cost ◽  
Effluent Quality ◽  
Monitoring Time ◽  
Paper Mill Wastewater

The study was based on a full scale activated sludge plant (AS) compared to a parallel operated pilot membrane bioreactor (MBR) with flat sheets membranes. Both systems received their influent from an anaerobic bioreactor treating paper mill wastewater. MBR produced an effluent of much better quality than AS in terms of suspended solids, containing 1 mg/L or less in 80% of the monitoring time, while the AS effluent contained 12 mg/L. This could save the necessity of further treatment by filtration in the case of MBR. Other effluent quality parameters, such as organic matter (COD and BOD), phosphorus and ammonia nitrogen, did not indicate substantial differences between AS and MBR. Calcium carbonate scaling and formation of a bacterial layer on the membrane caused severe flux reduction. The membrane blockage because of scaling and biofouling proved to be very serious, therefore, it required proper and more complicated maintenance than the AS system. This study leads to the conclusion that in the case of paper mill wastewater, after anaerobic biotreatment, if there is no need for excellent effluent quality in terms of suspended solids, the replacement of the AS by the MBR would not be strongly justified, mainly because of maintenance cost.

scholarly journals Qualitative Characterization of the Pellet Obtained from Hazelnut and Olive Tree Pruning

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4083
Author(s):  
Andrea Acampora ◽  
Vincenzo Civitarese ◽  
Giulio Sperandio ◽  
Negar Rezaei
Keyword(s):  
Renewable Energy Sources ◽  
Olive Tree ◽  
Quality Parameters ◽  
Important Place ◽  
Heating Value ◽  
Residual Biomass ◽  
Different Types ◽  
Olive Groves ◽  
Tree Pruning

Biomass occupies a very important place among renewable energy sources, and the residual biomass recovery chain represents a sector of fundamental importance. Our work focused on the production of pellets by pruning residues from two of the most important woody crops in Italy: hazelnut and olive groves. We found a higher value of bulk density for the hazelnut pellet (581.30 kg m−3 vs. 562.38 kg m−3) and a higher value of length for the olive pellet (16.66 mm vs. 10.47 mm). The percentages of durability were very similar (98%). The low heating value and ash content of hazelnut and olive were 17.21 MJ kg−1 and 3.1%, and 16.83 MJ kg−1 and 2.5%. A higher concentration of Cu, Pb, and Ni was observed in the hazelnut. The contrary was observed for the concentration of Zn. N content was 0.77% and 1.24% for the hazelnut and the olive, respectively. The concentration of S was 0.00% for both. The quality parameters that do not meet current standards could be improved by mixing these materials with different types of wood.

scholarly journals Qualidade de Água do Rio Cuiabá no Perímetro Urbano da Capital Mato-Grossense

UNICIÊNCIAS ◽  
2021 ◽  
Vol 24 (2) ◽  
pp. 158-164
Author(s):  
Jorge Luiz de Arruda ◽  
Ana Carolina Amorim Marques ◽  
Osvaldo Borges Pinto Junior
Keyword(s):  
Water Quality ◽  
Biochemical Oxygen Demand ◽  
Rainy Season ◽  
Quality Index ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Quality Parameters ◽  
Dry Period ◽  
Total Coliforms ◽  
Effluent Quality

Este trabalho apresenta uma análise do índice e dos parâmetros de qualidade de água no perímetro urbano do rio Cuiabá - MT, considerando uma variação temporal (período úmido e seco) e espacial (montante - jusante) no ano de 2015. Os resultados mostraram que maiores valores de turbidez, sólidos totais, oxigênio dissolvido, demanda bioquímica de oxigênio e coliformes totais foram obtidos no período úmido e que os maiores valores de pH, nitrogênio/nitrato e fósforo/fosfato ocorreram no período seco. O Índice de Qualidade de Água (IQA) foi maior no período seco em função de menores valores sólidos em suspensão, turbidez e coliformes totais. A análise da água da região perimetral ao rio Cuiabá demonstrou diferenças significativas entre os pontos mais a montante (Sucuri) em relação aos pontos a jusante (Porto e Caís) em ambos os períodos. Nesse sentido, o IQA foi menor nos pontos mais a jusante (Porto, Caís e Comunidade São Gonçalo Beira Rio) que nos pontos mais a montante (Sucuri e Ribeirão do Lipa). Os parâmetros estudados atendem a normatização da Resolução Conama 357/2005, apesar das diferenças no IQA para os pontos amostrados entre os períodos sazonais.   Palavras-chave: Efluente. Índice de Qualidade. Valoração Ambiental.   Abstract This work presents an analysis of the index and water quality parameters in the urban perimeter of  Cuiabá - MT, considering a temporal (rainy and dry period) and spatial (downstream) variation in the year 2015. Higher turbidity values, total dissolved oxygen, biochemical oxygen demand and total coliforms were obtained in the rainy season, while higher values ​​of pH, nitrogen / nitrate and phosphorus / phosphate occurred in the dry period.  IQA was higher in the dry period due to lower suspended solids, turbidity and total coliforms. The water analysis from the perimeter region to the Cuiabá river showed significant differences between the points upstream (Sucuri) in relation to the downstream points (Porto and Caís) in both periods. In this sense, the IQA was smaller in the points downstream (Porto, Caís and Comunidade São Gonçalo Beira Rio) than in the most upstream points (Sucuri and Ribeirao do Lipa). The studied parameters comply with the normalization of Conama Resolution 357/2005, despite the differences in the IQA for the points sampled between the seasonal periods.   Keywords: Effluent. Quality Index. Environmental Valuation.

New combined system of biological process and intermittent ozonation for advanced wastewater treatment

1998 ◽  
Vol 38 (8-9) ◽  
pp. 145-153 ◽  
Author(s):  
T. Kamiya ◽  
J. Hirotsuji
Keyword(s):  
Biological Treatment ◽  
Biological Process ◽  
Waste Water Treatment ◽  
Aeration Tank ◽  
Excess Sludge ◽  
Combined System ◽  
Remarkable Effect ◽  
Effluent Quality ◽  
Treatment Processes ◽  
Sludge Settling

A new system combining both biological treatment and intermittent ozonation has been developed to reduce excess sludge production with a small amount of ozone. In this system, activated sludge in the aeration tank was circulated via intermittent ozonation. Experimental results have shown that 50% of the sludge generation was cut down with only 30% of the ozone dose required for continuous ozonation. Furthermore, the process had a remarkable effect on maintaining the sludge settling characteristics. The sludge ozonation was almost of little influence on the effluent quality though the slight degradation of effluent quality was observed in few cases. These facts suggested the effectiveness of the newly proposed system for saving costs and stabilizing treatment performance of biological waste water treatment processes.

scholarly journals Treatment of Textile Wastewater by Coagulation Precipitation Method

2012 ◽  
Vol 4 (3) ◽  
pp. 623-633 ◽  
Author(s):  
M. A. Sabur ◽  
A. A. Khan ◽  
S. Safiullah
Keyword(s):  
Large Scale ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Quality Parameters ◽  
Precipitation Method ◽  
Alkaline Ph ◽  
Effluent Quality ◽  
The Individual ◽  
Influence Of Ph

Treatment of textile effluent, collected from Sattar Textile located at Chandra under Gazipur district, Bangladesh was carried out by chemical coagulation and precipitation method. The highly alkaline (pH=12.0) reddish orange colored effluent was characterized by chemical oxygen demand (COD) 1638 mg O2/L; total suspended solids (TSS) 9.76 g/L; total dissolved solids (TDS) 6.62 g/L and turbidly 31.24 FTU. In the present study, polyaluminium chloride (PAC) and SAFI (described in the results and discussions part) solutions were used as coagulants both individually and as their mixture at various ratios. As coagulation precipitation is highly pH sensitive, influence of pH was noted in each case. It was seen that the combined effect of both the coagulants is more effective than the individual effect of coagulants at a particular proportion at pH 6 for the removal of pollutional load from the effluent. The minimum dosages for the coagulants were worked out also from the initial beaker experiments. Finally, the effluent obtained from the large scale treatment was characterized for some effluent quality parameters and 90.17, 74.09 and 93.47% removal COD, TDS and turbidity were observed, respectively.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i3.10777 J. Sci. Res. 4 (3), 623-633 (2012)

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