scholarly journals Application of ferric-silicon coagulant-flocculant of electric steel smelting slag for leachate treatment of communal solid waste landfills

2018 ◽  
Vol 7 (2.23) ◽  
pp. 42
Author(s):  
T A. Vasilenko ◽  
A A. Koltun
Keyword(s):  
Chemical Properties ◽  
Oxygen Demand ◽  
Electric Steel ◽  
Steel Smelting ◽  
Leachate Treatment ◽  
Waste Products ◽  
Simultaneous Application ◽  
Sediment Volume ◽  
Smelting Slag ◽  
Physical And Chemical

In the Russian Federation the most common way of disposal of waste products is landfill. One of its drawbacks is the formation of highly contaminated filtration water. It was made an attempt to treat the leachate with a ferric coagulant-flocculant obtained from the electric steel smelting slag after the acid treatment with hydrochloric acid (the modification time of 1.5 N HCl at 40 °C is no more than 1 hour). To improve the treatment efficiency of highly contaminated leachate it was analysed  a simultaneous application of the obtained coagulant-flocculant and conventional coagulants Al(SO4)2 and ferric chloride). It was shown a decrease in the values of the chemical oxygen demand (COD) by 94.4%, the color of the leachate by (91.3%). It was  studied the physical and chemical properties of the filtration waters of the waste disposal landfill, as well as the dependence of the formation of the precipitable sediment volume on the portion of the injected coagulants and flocculant.  

scholarly journals Development of Technology of Release of Iron and Its Oxidic Connections from Dump Steel-Smelting Slag

2019 ◽  
Author(s):  
Sokhibjon Turdaliyevich Matkarimov ◽  
Anvar Abdullayevich Yusupkhodjayev ◽  
Bakhriddin Berdiyarov Berdiyarov
Keyword(s):  
Raw Materials ◽  
Uv Spectroscopy ◽  
Modern Physic ◽  
Electronic Microscopy ◽  
Steel Smelting ◽  
Chemical Methods ◽  
Granulometric Analysis ◽  
Smelting Slag ◽  
Physical And Chemical ◽  
To Receive

In article questions of development low-waste technologies of processing of steel-smelting slag are considered, gland allowing by extraction and its connections from steel-smelting slag to receive additional raw materials for production became, and the remains to use in building industry. Studying of gravitational methods of enrichment of steel-smelting slag and heat treatment the ore-fuel of pellets is the basis for work. Proceeding from it, in work modern physic-mechanical, chemical and physical and chemical methods of researches (UV-spectroscopy, electronic microscopy, the granulometric analysis) are used.

scholarly journals A Brief Review: Application of Recycled Polyethylene Terephthalate in Asphalt Pavement Reinforcement

2021 ◽  
Vol 13 (3) ◽  
pp. 1303
Author(s):  
Mohamed Meftah Ben Zair ◽  
Fauzan Mohd Jakarni ◽  
Ratnasamy Muniandy ◽  
Salihudin Hassim
Keyword(s):  
Polyethylene Terephthalate ◽  
Asphalt Mixture ◽  
Chemical Properties ◽  
Asphalt Mixtures ◽  
Sufficient Information ◽  
Waste Products ◽  
Pet Waste ◽  
Wet Process ◽  
Manufacturing Applications ◽  
Physical And Chemical

Plastic is considered one of the most significant industrial inventions of this era due to its excellent properties, which lend well to many manufacturing applications. These days, there are tons of Polyethylene Terephthalate (PET) waste products that are generated around the world. This waste presents a real environmental hazard because PET is not biodegradable. This paper delineates the physical and chemical properties of PET to justify its use as an additive and aggregate replacement in the manufacture of asphalt mixtures. Furthermore, discusses details of PET-modified asphalt mixture by a dry and wet process with sufficient information to better understand the mixture. Several critical matters are investigated, such as asphalt modification to increase resistance to fatigue, rutting deformation, and moisture sensitivity. These results are important for determining the factors that significantly improve pavement mixture characteristics. The findings show that the addition of PET to asphalt mixtures yielded very promising results. PET enhanced the mechanical properties, the durability, and the long-term sustainability of the pavement. Finally, using PET waste as an additive in asphalt mixtures could serve as an environmentally friendly method to dispose of PET waste while simultaneously producing high-quality pavements.

Selection of the Most Appropriate Leachate Treatment Methods: Part 1: A Review of Potential Biological Leachate Treatment Methods

1988 ◽  
Vol 23 (2) ◽  
pp. 308-328 ◽  
Author(s):  
D.J.L. Forgie
Keyword(s):  
Molecular Weight ◽  
Biological Treatment ◽  
Volatile Fatty Acids ◽  
Oxygen Demand ◽  
Leachate Treatment ◽  
Treatment Methods ◽  
Loading Rates ◽  
Treatment Train ◽  
Physical And Chemical ◽  
Selection Of

Abstract This paper presents a review of North American and European literature concerning the physical and chemical characteristics of leachate and the biological treatment methods that have been used or could be used to treat leachate. Leachate characteristics of particular interest include five-day biochemical oxygen demand (BOD5) , chemical oxygen demand (COD), the BOD5/COD ratio, molecular weight and or size of the organics, volatile fatty acids (VFA’s), ammonia and metals. It is demonstrated that biological leachate treatment is most appropriate when the BOD5/COD ratio is high (i.e. > 0.4) and the molecular weight of the majority of the organics is less than 500 g/mole. Tables summarizing the various biological leachate treatment process loading rates are presented. This paper serves as the basis for two companion papers: ”Selection of the Most Appropriate Leachate Treatment Methods, PART 2 : A Review of Recirculation, Irrigation and Potential Physical-Chemical Treatment Methods” and “Selection of the Most Appropriate Leachate Treatment Methods, PART 3: A Decision Model for Treatment Train Selection”.

scholarly journals WATER QUALITY ASSESSMENT OF PUNASA DAM (INDIRA SAGAR DAM), MADHYA PRADESH

2021 ◽  
Vol 9 (02) ◽  
pp. 501-508
Author(s):  
Heena Saraswat ◽  
◽  
Meenakshi Solanki ◽  
Keyword(s):  
Water Quality ◽  
Chemical Properties ◽  
Oxygen Demand ◽  
Water Quality Assessment ◽  
Madhya Pradesh ◽  
Phosphorus Concentration ◽  
Quality Guidelines ◽  
The Status ◽  
One Year ◽  
Physical And Chemical

The Indirasagar Dam (Punasa Dam) is a multipurpose key project of Madhya Pradesh on the Narmada river at Narmada Nagar in Khandwa (Tehsil of West Nimar district) Madhya Pradesh in India.The physical and chemical properties of water including temperature, pH, transparency, dissolved oxygen, biological oxygen demand, hardness, nitrate, calcium and phosphorus concentration, were monitored from October 2018 to September 2019. The physical and chemical parameters were analyzed as per APHA, revealed that there were fewer variations in the physicochemical parameters and results received through the entire one year of study showed that the status of water quality is quite normal and within the permissible limit as mentioned with ISI.Moreover, according to the findings of this research and their comparison with the national and international water quality guidelines/standards, it could be said that the water quality of Punasa dam during the study period was acceptable. However, due to the changes occurred in nitrate and phosphorus and extensive development of eutrophication problem, accurate and continuous evaluation of water quality in this reservoir is deemed necessary.

scholarly journals Reed rootfelt for constructed wetlands

2019 ◽  
pp. 173-179
Author(s):  
Imants Plume
Keyword(s):  
Constructed Wetlands ◽  
Organic Matter Content ◽  
Chemical Properties ◽  
Average Density ◽  
Matter Content ◽  
Limited Area ◽  
Leachate Treatment ◽  
Oscillating Saw ◽  
Pre Treatment ◽  
Physical And Chemical

The resources of lakes' overgrowth biomass increases in result of eutrofication process inmore than 2000 lakes in Latvia. Usage of lake reed rootfelt for filling of constructed wetlandscan improve leachate treatment at a beginning period of operation and especially applicable intreatment plants with limited area. Physical and chemical properties of Reed rootfelt of lakeZebras were investigated to evaluate possibilities for rootfelt usage in constructed wetlands.The Reed rootfelt coalesces with the ground in coastal zone and is floating in the deeper areasof lake. Thickness of floating reed rootfelt layer varies from 0.25 to 0.8 m. Density (withoutgravitational water) of reed rootfelt varies from 550 kg/ml at a surface to 1058 kg/m' indeeper layers if the rootfelt coalesces with ground. Investigated average density is 505 kg/mland 814 kg/ml for floated overgrowth and rootfelt coalesced with ground respectively. Themoisture content (without gravitational water, dry basis) of freshly removed floated rootfeltchanges from 523 % at a surface to 706 % in deeper layer. If rootfelt was dried and moistenedonce more, moisture content remain practically same at a surface (498 %) and decreases 3times in deeper layer (226 %). Investigated average organic matter content were 77 % forfloating rootfelt and 49 % for rootfelt coalescing with ground. The specific energy of rootfeltcutting is 8,6 kJ/m2 for oscillating saw, 18.1 kJ/m2 for vertical blade and IO kJ/m2 for bladesloped in 45°. Acceptable technology for rootfelt removal includes partitioning of overgrowthin pieces and/or layers by manually operated or powered cutters and floating of pieces ofrootfelt to coastal stockpile. Pre-treatment of rootfelt includes washing out of inorganicsediments, draining of the excess (gravitational) water and drying slightly only, to preservegrowing ability of rootfelt. Thickness of rootfelt pieces can be increased for filling of areaclose to inlets in constructed wetlands to provide additional structure for enchancedflocculation and sedimentation. Methods of rootfelt pieces removal, handling andtransportation avoid destruction of removed biomass and ensure high initial growing ability.

DECREASE IN TECHNOGENIC LOAD OF AGRICULTURAL LANDS FROM PLACEMENT OF DRILL CUTTINGS ON THEM

2020 ◽  
Author(s):  
A.S. Vlasov ◽  
◽  
K.G. Pugin ◽  
◽  
Keyword(s):  
Agricultural Land ◽  
Negative Impact ◽  
Chemical Properties ◽  
Oxygen Demand ◽  
Road Construction ◽  
Oil Fields ◽  
Cement Slurry ◽  
Drill Cuttings ◽  
Environmental Objects ◽  
Physical And Chemical

The urgency of the problem of contamination of parts of agricultural land from the placement of drilling barns on them is described. Methods of reducing the negative impact on environmental objects from drill cuttings are presented. Samples of drill cuttings at several large oil fields were selected as objects of study. The results of studies of the physical and chemical properties of drill cuttings showed that there are excesses of permissible values for chemical oxygen demand, solids, chlorides, oil products, solids, hardness, magnesium and calcium ions, and chlorides. To reduce the negative impact, the direction of disposal of drill cuttings in road construction was chosen. A cement slurry-based cement primer was obtained, which belongs to the M20 strength grade, but has insufficient frost resistance, due to which it is recommended for use in countries characterized by tropical and subtropical climates

scholarly journals Physical and Chemical Properties of Surface Waters in the Różany Strumień Catchment in The Years 1988–2012

2017 ◽  
Vol 36 (1) ◽  
pp. 33-49
Author(s):  
Monika Okońska ◽  
Katarzyna Pietrewicz
Keyword(s):  
Surface Waters ◽  
Catchment Area ◽  
Anthropogenic Impacts ◽  
Chemical Properties ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Physical And Chemical Properties ◽  
Hydrogen Carbonate ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract The Różany Strumień catchment located in the north of Poznań is an example of a small anthropogenically-induced catchment. The main aim of this study is to analyse the variability of selected physical and chemical properties of surface waters in the catchment area in the years 1988-2012. It was found that surface waters in the catchment can be classified as hard and very hard, with slightly basic pH. The deterioration of Różany Strumień water quality concerns chemical oxygen demand, conductivity, chlorides, sodium, ammonia nitrogen and nitrite nitrogen concentrations. The authors of the study have noticed a decrease in the amount of phosphates and sulphates in the water. As observed, the hydrogeochemical type of water changed from calcium-hydrogen carbonate-sulphate into calcium-sodium-hydrogen carbonate-sulphate-chloride. Changes in water chemistry are probably a result of anthropogenic impacts, and they can be associated with the transformation of land use in the catchment area, i.e. the ongoing urbanization of the area.

scholarly journals BOD5 Prediction Using machine learning methods

2021 ◽  
Author(s):  
Kai Sheng Ooi ◽  
ZhiYuan Chen ◽  
Phaik Eong Poh ◽  
Jian Cui
Keyword(s):  
Machine Learning ◽  
Feature Selection ◽  
Water Samples ◽  
Chemical Properties ◽  
Oxygen Demand ◽  
Support Vector ◽  
Learning Framework ◽  
Sequential Feature Selection ◽  
Similar Range ◽  
Physical And Chemical

Abstract Biological oxygen demand (BOD5) is an indicator used to monitor water quality. However, the standard process of measuring BOD5 is time consuming and could delay crucial mitigation works in the event of pollution. To solve this problem, this study employed multiple machine learning (ML) methods such as random forest (RF), support vector regression (SVR) and multilayer perceptron (MLP) to train a best model that can accurately predict the BOD5 values in water samples based on other physical and chemical properties of the water. The training parameters were optimized using genetic algorithm (GA) and feature selection was done using sequential feature selection (SFS) method. The proposed machine learning framework was firstly tested on the public dataset (Waterbase). MLP method produced the best model, with R2 score of 0.7672791942775417, relative MSE and relative MAE of approximately 15%. Feature importance calculations indicated that CODCr, Ammonium and Nitrate are features that highly correlates to BOD5. In the field study with a small private dataset consisting of water samples collected from two different lakes in Jiangsu Province of China, the trained model was found to have similar range of prediction error (around 15%), similar relative MAE (around 14%) and achieved about 6% better relative MSE.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Biophysical Measurement of Molecular Weight of Foot-and-Mouth Disease RNA Fragments

1974 ◽  
Vol 32 ◽  
pp. 262-263
Author(s):  
Sydney S. Breese ◽  
Howard L. Bachrach
Keyword(s):  
Chemical Properties ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Distilled Water ◽  
Bovine Plasma ◽  
Mouth Disease Virus ◽  
Foot And Mouth ◽  
Carbon Coated ◽  
Rna Fragments ◽  
Physical And Chemical

Continuing studies on the physical and chemical properties of foot-and-mouth disease virus (FMDV) have included electron microscopy of RNA strands released when highly purified virus (1) was dialyzed against demlneralized distilled water. The RNA strands were dried on formvar-carbon coated electron microscope screens pretreated with 0.1% bovine plasma albumin in distilled water. At this low salt concentration the RNA strands were extended and were stained with 1% phosphotungstic acid. Random dispersions of strands were recorded on electron micrographs, enlarged to 30,000 or 40,000 X and the lengths measured with a map-measuring wheel. Figure 1 is a typical micrograph and Fig. 2 shows the distributions of strand lengths for the three major types of FMDV (A119 of 6/9/72; C3-Rezende of 1/5/73; and O1-Brugge of 8/24/73.

Sign in / Sign up

Export Citation Format

Share Document