Comparison of Various Systems for On-Site Wastewater Treatment

1990 ◽  
Vol 22 (3-4) ◽  
pp. 41-48 ◽  
Author(s):  
Frits A. Fastenau ◽  
Jaap H. J. M. van der Graaf ◽  
Gerard Martijnse
Keyword(s):  
Wastewater Treatment ◽  
Large Scale ◽  
Research Work ◽  
Field Research ◽  
Limiting Factors ◽  
Land Claims ◽  
Rotating Biological Contactor ◽  
Advantages And Disadvantages ◽  
Different Types ◽  
Selection Of

Diffuse pollution, caused by direct discharges from individual houses, small built-up nuclei, farms, camp-sites, etc., for which connection to central wastewater treatment systems is unfeasible, may be significantly reduced by on-site treatment. Based on a large scale research, including intensive field-research work on 14 systems of different types and sizes in a range equal to population equivalents (p.e) of 5 - 200 persons, 8 different types of system were compared. The comparison involved technological features, such as removal efficiency, reliability, operational and maintenance aspects, environmental impacts and land claims, together with economical features showing significant differences. Advantages and disadvantages of each system are highlighted to enable a selection of suitable systems to be made. When no limiting factors are present, it was found that - in general-infiltration systems (infiltration pits; infiltration trenches) have the best features for on-site treatment up to 100 p.e. For larger capacities, or when infiltration is not possible, the rotating biological contactor will be the best solution mainly because of the lower costs.

Bottlenecks in the Implementation of On-Site Wastewater Treatment Plants on a Large Scale in The Netherlands

1990 ◽  
Vol 22 (3-4) ◽  
pp. 291-298
Author(s):  
Frits A. Fastenau ◽  
Jaap H. J. M. van der Graaf ◽  
Gerard Martijnse
Keyword(s):  
Wastewater Treatment ◽  
The Netherlands ◽  
Large Scale ◽  
Wastewater Treatment Plants ◽  
Housing Stock ◽  
Research Work ◽  
Field Research ◽  
Domestic Wastewater ◽  
Research Programme ◽  
Definition Of

More than 95 % of the total housing stock in the Netherlands is connected to central sewerage systems and in most cases the wastewater is treated biologically. As connection to central sewerage systems has reached its economic limits, interest in on-site treatment of the domestic wastewater of the remaining premises is increasing. A large scale research programme into on-site wastewater treatment up to population equivalents of 200 persons has therefore been initiated by the Dutch Ministry of Housing, Physical Planning and Environment. Intensive field-research work did establish that the technological features of most on-site biological treatment systems were satisfactory. A large scale implementation of these systems is however obstructed in different extents by problems of an organisational, financial and/or juridical nature and management difficulties. At present research is carried out to identify these bottlenecks and to analyse possible solutions. Some preliminary results are given which involve the following ‘bottlenecks':-legislation: absence of co-ordination and absence of a definition of ‘surface water';-absence of subsidies;-ownership: divisions in task-setting of Municipalities and Waterboards; divisions involved with cost-sharing;-inspection; operational control and maintenance; organisation of management;-discharge permits;-pollution levy;-sludge disposal. Final decisions and practical elaboration of policies towards on-site treatment will have to be formulated in a broad discussion with all the authorities and interest groups involved.

scholarly journals Biotechnological valorization of agro industrial and household wastes for lactic acid production

2019 ◽  
Vol 21 (1) ◽  
pp. 113-127 ◽  
Author(s):  
Juliana Romo-Buchelly ◽  
María Rodríguez-Torres ◽  
Fernando Orozco-Sánchez
Keyword(s):  
Lactic Acid ◽  
Large Scale ◽  
Lactic Acid Production ◽  
Scale Production ◽  
Advantages And Disadvantages ◽  
Large Scale Production ◽  
Different Types ◽  
High Transformation ◽  
Transformation Potential ◽  
The Cost

Lactic acid (LA) is an organic compound used in several industries, such as food, textile, chemical, and pharmaceutical. The global interest  in  this  product  is  due  to  its  use  for  the  synthesis  of  numerous  chemical  compounds,  including  polylactic  acid,  a  biode-gradable thermoplastic and substitute for petroleum-derived plastics. An in-depth overview of the use of industrial and household wastes as inexpensive substrates in order to reduce the cost of LA production is presented. A review is carried out of the biotech-nological aspects that must be taken into account when using some wastes with high transformation potential to produce LA in a submerged  culture,  as  well  recommendations  for  their  use.  The  advantages  and  disadvantages  of  different  types  of  treatments used for the transformation of waste into suitable substrates are considered. Several methods of fermentation, as well as genetic strategies for increasing the production, are summarized and compared. It is expected that in a few years there will be many ad-vances in these areas that will allow greater large-scale production of LA using agroindustrial or household wastes, with potential positive economic and environmental impact in some regions of the planet.

Geographical distribution of land types and primary field research work in Jalilabad Cadastral District

2020 ◽  
Vol 04 (05) ◽  
pp. 44-48
Author(s):  
Narmin Zakir Najafova ◽  
Keyword(s):  
Geographical Distribution ◽  
Large Scale ◽  
Research Work ◽  
Field Research ◽  
Soil Formation ◽  
Large Area ◽  
Large Scale Land ◽  
Physical And Chemical ◽  
Land Types ◽  
Zonal Soils

Factors influencing the formation of land cover of Jalilabad cadastral region are one of the reasons for the diversity of soil formation processes in the area. Intra-zonal soils are subject to the laws of vertical zoning due to changes in the height of the area due to its geographical distribution. Despite the fact that the Jalilabad cadastral region does not have a very large area, its separate parts are characterized by differences in bioclimatic and biogeochemical characteristics. The article shows the analysis and geographical coordinates of the main soil types formed in the Jalilabad cadastral region on the basis of a large-scale land map, depending on the soil-ecological conditions. In order to carry out comparative and ecological assessment of soils, we have made land plots in the study area. Currently, the cut samples are in the laboratory stage for physical and chemical analysis in accordance with the methodology. Key words: soil type, mechanical composition, soil structure, soil profile, GPS

Geographical distribution of land types and primary field research work in Jalilabad Cadastral District

2021 ◽  
Vol 03 (01) ◽  
pp. 88-93
Author(s):  
Nərmin Zakir qızı Nəcəfova Zakir qızı Nəcəfova ◽  
Keyword(s):  
Geographical Distribution ◽  
Large Scale ◽  
Research Work ◽  
Field Research ◽  
Soil Formation ◽  
Large Area ◽  
Large Scale Land ◽  
Physical And Chemical ◽  
Land Types ◽  
Zonal Soils

Factors influencing the formation of land cover of Jalilabad cadastral region are one of the reasons for the diversity of soil formation processes in the area. Intra-zonal soils are subject to the laws of vertical zoning due to changes in the height of the area due to its geographical distribution. Despite the fact that the Jalilabad cadastral region does not have a very large area, its separate parts are characterized by differences in bioclimatic and biogeochemical characteristics. The article shows the analysis and geographical coordinates of the main soil types formed in the Jalilabad cadastral region on the basis of a large-scale land map, depending on the soil-ecological conditions. In order to carry out comparative and ecological assessment of soils, we have made land plots in the study area. Currently, the cut samples are in the laboratory stage for physical and chemical analysis in accordance with the methodology. Key words: soil type, mechanical composition, soil structure, soil profile, GPS

scholarly journals The limiting factors for the snow leopard (Panthera uncia Shreber, 1776) on the territory of Tuva

2020 ◽  
Vol 9 (4) ◽  
pp. 93-98
Author(s):  
Aleksandr Nikolaevich Kuksin
Keyword(s):  
Abiotic Factors ◽  
Research Work ◽  
Field Research ◽  
Limiting Factors ◽  
Anthropogenic Factors ◽  
High Mountain ◽  
Snow Leopard ◽  
Leading Role ◽  
Disturbance Factor ◽  
Cattle Breeders

The paper presents the influence of limiting factors for the population of the snow leopard on the territory of Tuva (Republic of Tuva, Russia). It describes biotic, abiotic and anthropogenic factors to irbis. The author examines the role and degree of each factor of this influence. The paper represents literature sources and the authors field research work data for the period 20012019. The study was carried out on the territory of the Chikhacheva, Tsagan-Shibetu, Shapshalskiy Ranges and Sangilen Highlands, that are permanent habitats for the snow leopard. On the studied territories the anthropogenic influence such as hunting, extension of highways, cattle farms and the number of livestock increases in the high mountain ecosystems. All this leads to an increase of disturbance factor, a displacement from traditional habitats of wild animals, especially the irbis food items, so it is forcing the snow leopard to rely more on livestock for food. As a result the cattle breeders sometimes kill snow leopards in retaliation for attacking their livestock. The paper demonstrates data of all known incidents of the snow leopard death and finds of cadavers within the studied region which shows that 74% of all incidents are the fault of people for destroying this rare animal. So it proves that the anthropogenic factor plays a leading role in the death of snow leopard among others. Keywords: irbis; snow leopard; ecology; Tuva; Republic of Tuva; limiting factors; biotic factors; abiotic factors; anthropogenic factors; disturbance factor; causes of death of irbis; diseases of irbis; competitors of irbis; snow leopard attacks on livestock.

Fenton Reaction Induced by Fe-Based Nanoparticles for Tumor Therapy

2021 ◽  
Vol 17 (8) ◽  
pp. 1510-1524
Author(s):  
Jian Zhou ◽  
Miao Lei ◽  
Xue-Liang Peng ◽  
Dai-Xu Wei ◽  
Lu-Ke Yan
Keyword(s):  
Wastewater Treatment ◽  
Cancer Cells ◽  
Fenton Reaction ◽  
Human Cancer ◽  
Tumor Therapy ◽  
Iron Ions ◽  
Advantages And Disadvantages ◽  
Different Types ◽  
The Future ◽  
Iron Based

Fenton reaction, a typical inorganic reaction, is broadly utilized in the field of wastewater treatment. Recently In case of its ability to inhibit the growth of cancer cells, it has been frequently reported in cancer treatment. Using the unique tumor microenvironment in cancer cells, many iron-based nanoparticles have been developed to release iron ions in cancer cells to induce Fenton reaction. In this mini review, we outline several different types of iron-based nanoparticles and several main means to enhance Fenton reaction in cancer cells. Finally, we discussed the advantages and disadvantages of iron-based nanoparticles for cancer therapy, prospected the future development of iron-based nanoparticles. It is believed that iron-based nanoparticles can make certain contribution to the cause of human cancer in the future.

scholarly journals A Log-Based Anomaly Detection Method with Efficient Neighbor Searching and Automatic K Neighbor Selection

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Bingming Wang ◽  
Shi Ying ◽  
Zhe Yang
Keyword(s):  
Anomaly Detection ◽  
Large Scale ◽  
Nearest Neighbor ◽  
Detection Method ◽  
Tree Model ◽  
Log Data ◽  
Neighbor Search ◽  
Different Types ◽  
Efficient Selection ◽  
Selection Of

Using the k-nearest neighbor (kNN) algorithm in the supervised learning method to detect anomalies can get more accurate results. However, when using kNN algorithm to detect anomaly, it is inefficient at finding k neighbors from large-scale log data; at the same time, log data are imbalanced in quantity, so it is a challenge to select proper k neighbors for different data distributions. In this paper, we propose a log-based anomaly detection method with efficient selection of neighbors and automatic selection of k neighbors. First, we propose a neighbor search method based on minhash and MVP-tree. The minhash algorithm is used to group similar logs into the same bucket, and MVP-tree model is built for samples in each bucket. In this way, we can reduce the effort of distance calculation and the number of neighbor samples that need to be compared, so as to improve the efficiency of finding neighbors. In the process of selecting k neighbors, we propose an automatic method based on the Silhouette Coefficient, which can select proper k neighbors to improve the accuracy of anomaly detection. Our method is verified on six different types of log data to prove its universality and feasibility.

scholarly journals Glycans as Biomarkers: Status and Perspectives

2011 ◽  
Vol 30 (3) ◽  
pp. 213-223 ◽  
Author(s):  
Miroslava Janković
Keyword(s):  
Large Scale ◽  
Biomarker Discovery ◽  
High Sensitivity ◽  
Disease Diagnosis ◽  
Protein Glycosylation ◽  
Post Translational Modification ◽  
Different Types ◽  
Progression Of Disease ◽  
New Biomarkers ◽  
Selection Of

Glycans as Biomarkers: Status and PerspectivesProtein glycosylation is a ubiquitous and complex co- and post-translational modification leading to glycan formation, i.e. oligosaccharide chains covalently attached to peptide backbones. The significance of changes in glycosylation for the beginning, progress and outcome of different human diseases is widely recognized. Thus, glycans are considered as unique structures to diagnose, predict susceptibility to and monitor the progression of disease. In the »omics« era, the glycome, a glycan analogue of the proteome and genome, holds considerable promise as a source of new biomarkers. In the design of a strategy for biomarker discovery, new principles and platforms for the analysis of relatively small amounts of numerous glycoproteins are needed. Emerging glycomics technologies comprising different types of mass spectrometry and affinity-based arrays are next in line to deliver new analytical procedures in the field of biomarkers. Screening different types of glycomolecules, selection of differentially expressed components, their enrichment and purification or identification are the most challenging parts of experimental and clinical glycoproteomics. This requires large-scale technologies enabling high sensitivity, proper standardization and validation of the methods to be used. Further progress in the field of applied glycoscience requires an integrated systematic approach in order to explore properly all opportunities for disease diagnosis.

scholarly journals Expert assessment method in foresight studies

2019 ◽  
Vol 16 (4) ◽  
pp. 4-13
Author(s):  
O. I. Karasev ◽  
E. I. Mukanina
Keyword(s):  
Delphi Method ◽  
Research Work ◽  
Assessment Method ◽  
Theoretical Research ◽  
Expert Assessment ◽  
Advantages And Disadvantages ◽  
Expert Model ◽  
Expert Assessments ◽  
Necessary And Sufficient ◽  
Selection Of

Purpose of the study. The main goal of this research is to identify key aspects of expert assessments and offer high-quality recommendations for their improvement.Materials and methods. Foresight is built on the basis of expert assessment method, includes: active formation of the image of the future instead of its probabilistic prediction, focus on identifying key development priorities, participation in the study of key stakeholders, the relationship with the management decision-making process. The methods of analysis used in the work suggest methods of theoretical research in the form of analysis and modeling. In the course of the research, the following tasks were solved: firstly, the Expert model was formed based on the necessary and sufficient criteria for selecting respondents to the foresight study; secondly, the main characteristics of the Delphi method for consensus decisions in expert groups were identified. The research work considers various sources of information, which became the basis for the further development of the Expert model, based on an integrated approach based on the statistical, sociological and economic fields of science.Results. On the basis of bibliometric analysis, important criteria for the selection of experts were highlighted: a practical component, a theoretical component, a creative component, an assessment of belonging to a field of study, an assessment of work in a study, an adjustment of results. The relevance of the selection of an expert greatly influences the result of the foresight, therefore, there is a need for a balanced selection of respondents to the study. Foresight studies have a distinctive feature from other areas in that the result is the achievement of consensus between experts in the subject area. Decision makers are drawn from three areas of activity business, government, science. In this regard, criteria for the selection of respondents were formed, which imply the necessary and sufficient conditions. The necessary criteria are understood as such parameters, without which the characteristics of the expert do not allow the respondent to be an expert for this study. A sufficient condition for the participation of the decision maker in the foresight analysis implies such selection criteria, which are complementary characteristics of the expert, which do not need to prove that the expert is a suitable expert for a specific study. As a result, four necessary criteria for the selection of experts for groups were identified, as well as individual sufficient criteria for each group. The process of carrying out the Delphi method is considered, the advantages and disadvantages are determined, on the basis of which the resulting indicator is proposed the foresight research reliability index.Conclusion. The method of selection of experts allows a comprehensive approach to the problem in the field of formation of expert groups based on the introduction of digital technologies that improves the qualitative characteristics of foresight research. The confidence index, as a result indicator, determines the objectivity of the study based on expert assessments.

Upgrading of wastewater treatment plants equipped with rotating biological contactors to nitrification and P removal

2000 ◽  
Vol 41 (1) ◽  
pp. 145-153 ◽  
Author(s):  
O. Nowak
Keyword(s):  
Wastewater Treatment ◽  
Oxygen Concentration ◽  
Phosphorus Removal ◽  
Wastewater Treatment Plants ◽  
Research Work ◽  
Design Parameters ◽  
Different Types ◽  
Rotating Biological Contactors ◽  
The Impact ◽  
P Removal

In the course of a research project on the further use of treatment plants with rotating biological contactors for nitrification and phosphorus removal, full-scale investigations were carried out. From the results design parameters for phosphorus pre-precipitation as well as for secondary and tertiary nitrifying RBCs were derived. Regarding the impact of the oxygen concentration, the alkalinity and the pH, respectively, on nitrifying biofilms, former research work could mostly be confirmed. Concepts for the upgrading of different types of RBC plants are discussed - including cost estimations.

Sign in / Sign up

Export Citation Format

Share Document