scholarly journals Complex Alumina-Ferrous Coagulant for Effective Wastewater Purification from Hydrogen Sulfide

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Erzhan I. Kuldeyev ◽  
Aysha E. Tastanova ◽  
Igor V. Bondarenko ◽  
Saniya S. Temirova ◽  
Ruslan E. Nurlybayev ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Raw Materials ◽  
Fine Powder ◽  
Sewage Water ◽  
Urban Sewage ◽  
Air Atmosphere ◽  
Pump Station ◽  
Complete Purification ◽  
Sewage Water Treatment ◽  
Sewage Systems

The article provides an overview of studies on the causes of the formation of hydrogen sulfide in anaerobic conditions of urban sewage systems and methods for neutralizing toxic reagent sulfur-containing compounds. It is noted that the presence of sulfur compounds and organic components in sewage flow leads to the formation and release of hydrogen sulfide into the atmosphere of settlements. Three main categories of methods for purifying sewage wastewater from hydrogen sulfide are presented. In this work, a complex alumina-ferrous coagulant has been developed from Kazakh raw materials. Based on natural ferruginous diatomite and middlings of sintered alumina, a complex alumina-ferrous coagulant has been synthesized, which is effective in purifying wastewater from hydrogen sulfide, accelerating the processes of sedimentation and clarification of sewage slurries. Experimental results also show that with the supply of increased amounts of coagulant, oil and oil films disappear from the surface of the cylinder, an almost complete purification of effluents from hydrogen sulfide compounds occurs, and the color of the liquid part is greatly reduced. In addition, the advantage of the developed reagent is that it is presented in the form of fine powder and can be easily dosed and added to a canalization pump station to interact with diluted hydrogen sulfide and be transported to sewage fields. Compared to other proposed methods in previous works, the reagent is suitable to be used directly in sewage systems such as sewage waters treatment plants and collectors to prevent hydrogen sulfide emission into the air atmosphere of populated areas, as well as at city sewage water treatment stations after air tanks and before secondary clarifiers to obtain better purified water suitable for watering agricultural plants.

TECHNOLOGICAL FOUNDATIONS OF ENVIRONMENTALLY FRIENDLY ORGANIZATION OF A SEWAGE SYSTEM

2017 ◽  
pp. 59-66 ◽  
Author(s):  
S.I. Shamanskyi ◽  
S.V. Boichenko ◽  
I.V. Matvyeyeva
Keyword(s):  
Carbon Dioxide ◽  
Water Treatment ◽  
Sewage Sludge ◽  
Organic Fertilizer ◽  
Negative Influence ◽  
Sewage Water ◽  
Sewage System ◽  
Environmentally Safe ◽  
Sewage Water Treatment ◽  
Sewage Systems

Modern sanitary sewage systems, which apply traditional methods of sewage water treatment, not always can provide acceptable quality of treated waters for their environmentally safe discharge into water bodies. In addition, applied methods of sewage sludge utilization, which are produced during treatment processes, lead to substantial negative influence on environment. All of these things result in appearance of ecological risks, related to functioning of sewage systems. Because of this, there is a necessity for additional sewage water treatment and for improvement sewage sludge utilization methods. Virtues and shortcomings of modern methods of sewage water aftertreatment and sewage sludge utilization are analyzed in this paper. There is proposed a new arrangement of a sanitary sewage system. The system applies sewage water aftertreatment in photobioreactors by using the water as environment for energy microalgae cultivation and producing liquid biofuel of the third generation out of them. It also applies sewage sludge digestion in anaerobic installations with producing methane enriched biogas, environmentally safe organic fertilizer and carbon dioxide. There is also proposed to utilize carbon dioxide in photobioreactors for providing the process of photosynthesis. Bibl. 18, Fig. 1.

Preventing Accidental Spills: Risk Analysis and the Discharge Permitting Process

1994 ◽  
Vol 29 (3) ◽  
pp. 189-197 ◽  
Author(s):  
Frans A. N. van Baardwijk
Keyword(s):  
Risk Analysis ◽  
Surface Waters ◽  
Legal Framework ◽  
Sewage Water ◽  
Correction Factors ◽  
Analysis Method ◽  
Sewage Water Treatment ◽  
Accident Scenarios ◽  
Contaminating Substances ◽  
Permitting Process

The contribution of accidental discharges to the total emission of contaminating substances in surface waters is relatively increasing, as regular discharges are reduced. In The Netherlands a program has been started to develop a quantitative risk analysis method to be used within the discharge permitting process. The methodology takes into account the type of activities and related accident scenarios in terms of failure frequencies and source sizes, correction factors according to specific circumstances, as well as the nature of the receiving system (types of surface waters, but also public sewage water treatment plants). The methodology will provide an indication of the risk reduction needed in terms of reducing the frequency and/or the volume of possible spills. The method itself, the use of it within the legal framework and the relation with the EC-Directives are discussed.

Synthesis and Characterization of Polycrystalline Fe1.025Se Prepared Using Mechanical Alloying Followed by Powder in a Sealed Tube Method

2020 ◽  
Vol 855 ◽  
pp. 96-101
Author(s):  
Sigit Dwi Yudanto ◽  
Ryan Fitriandhani ◽  
Andika Widya Pramono ◽  
Agung Imaduddin ◽  
Budhy Kurniawan
Keyword(s):  
Raw Materials ◽  
Resistivity Measurement ◽  
Milled Powder ◽  
Sintered Sample ◽  
Atomic Ratio ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Air Atmosphere ◽  
Measurement Results

In this work, preparation of Fe1.025Se samples was done using a solid-state reaction. Iron and selenium powder were used as raw materials. The raw materials were milled using a shaker mill for 5 hours after weighed in an atomic ratio of Fe:Se=1.025:1. To find out the formation of polycrystalline Fe1.025Se, the milled powder was then compacted in a stainless-steel tube and sintered at a temperature of 355°C (for sample 1) and 745°C (for sample 2) for 6 hours. All samples were sintered in the air atmosphere and cooled rapidly in the air. XRD was used to analyze the phase formation. Based on the diffraction pattern calculation, the sintered sample at a temperature of 745°C has a higher mass fraction of the tetragonal phase than the sample sintered at 355°C. The lattice parameters of the sample sintered at a temperature of 745°C are a = 3.7688 Å and c = 5.5236 Å. According to the resistivity measurement results, it appears that the sample sintered at 745°C has a critical temperature onset of ~13.28 K.

Proportional Control of Dissolved Oxygen Concentration of Sewage Water Treatment in Oil Field

2013 ◽  
Vol 421 ◽  
pp. 798-802
Author(s):  
Chao Xie
Keyword(s):  
Water Treatment ◽  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Design Procedure ◽  
Sewage Water ◽  
Oil Field ◽  
Dissolved Oxygen Concentration ◽  
Proportional Control ◽  
Simulation Results ◽  
Sewage Water Treatment

Activated sludge method is mainly used to sewage water treatment of water injection system in oil field, dissolved oxygen of sewage pond plays a important role in the sewage water treatment process. The proportional control algorithm of dissolved oxygen concentration is developed based on a first time delay model, and the parameter values of the controller is determined by using stability margins design approach. Simulation results are provided to illustrate the design procedure and the effectiveness of the proposed methods. When applying to the wastewater treatment system based on activated sludge, this method can achieve a satisfied treating performance with robustness. Simulation results are given to demonstrate the design procedure and the effectiveness of the proposed methods.

Injection Moulding of A Bimodal Size Distribution 316L Stainless Steel Powders

2012 ◽  
Author(s):  
M.A. Omar
Keyword(s):  
Stainless Steel ◽  
Polyethylene Glycol ◽  
Polymethyl Methacrylate ◽  
Injection Moulding ◽  
Raw Materials ◽  
Fine Powder ◽  
Steel Powder ◽  
Water Leaching ◽  
Coarse Powder ◽  
Metal Injection Moulding

Bagi mengurangkan kos bahan mentah untuk proses pangacuan suntikan logam (MIM), bahan teracu yang diperbuat daripada serbuk logam keluli tahan karat dengan nisbah serbuk logam kasar dan halus yang berlainan telah diselidiki. Bahan suapan tersebut disediakan dengan menggunakan sistem bahan pengikat komposit yang terdiri sebahagian besarnya polietilina glikol (PEG) yang berlainan berat molekulnya dan emulsi polimetil metakrilat (PMMA) yang seterusnya disuntik ke dalam bentuk segiempat tepat dengan suhu muncung suntikan logam pada 140°C. Hasil ujikaji menunjukkan kekuatan bahan teracu meningkat secara linear dengan peningkatan nisbah serbuk halus di dalam campuran dan optimum pada 30 wt.% dan seterusnya berlaku penurunan dengan peningkatan nisbah serbuk halus. Peningkatan serbuk logam halus di dalam campuran juga dapat meningkatkan ketumpatan akhir dan kekerasan bahan tersinter. Kadar penyingkiran polietilina glikol semasa proses pengurasan air meningkat dengan penurunan nisbah serbuk logam halus yang mana menunjukkan bahawa serbuk logam kasar memberi kesan ketara ke atas proses penyingkiran bahan pengikat. Kata kunci: pengacuan suntikan logam; polietilina glikol; polimetil metakrilat; pengurusan air; pengsinteran In an effort to lower the cost of raw materials of metal injection moulding (MIM), a moulded part made of a different ratio of coarse and fine stainless steel powder mixtures, ranging from 10 to 50 wt.% of fine powder were investigated. The feedstocks were prepared using a composite binder system which consist of a major fraction of polyethylene glycol (PEG) with different molecular weight and a minor fraction of polymethyl methacrylate (PMMA) emulsion and subsequently moulded into a rectangular shape at the nozzle temperature of 140°C. The results show that the green strength of the moulded part increased linearly with the increased of the ratio of fine powder to an optimum of 30 wt.% and decreased slightly with the increased of coarse/fine ratio. An increase in the fine powder in the mixture, improved the final densification and hardness of the sintered parts. The rate of PEGs removed during water leaching substantially increased with the lower ratio of fine powder, which suggest that the coarse powder has significant influence on the removal of the binder. Key words: metal injection moulding; polyethylene glycol; polymethyl methacrylate; water leaching; sintering

scholarly journals Future Options for Sewage and Drainage Systems Three Scenarios for Transitions and Continuity

2019 ◽  
Vol 11 (5) ◽  
pp. 1383 ◽  
Author(s):  
Karel Mulder
Keyword(s):  
Sustainable Development ◽  
Systems Change ◽  
System Innovation ◽  
Urban Drainage ◽  
Drainage Systems ◽  
Urban Sewage ◽  
Sewage System ◽  
Vital Functions ◽  
Urban Drainage Systems ◽  
Sewage Systems

The challenge of sustainable development requires cities to aim for drastic improvements in the systems that support its vital functions. Innovating these systems can be extremely hard, and might take lots of time. A transparent and democratic strategy is important to guarantee support for change. Such a process should aim at developing consensus regarding a basic vision to guide the process of systems change. This paper sketches future options for the development of sanitation- and urban drainage systems in industrialized economies. It will provide an analysis of relevant trends for sewage system innovation. In history, sewage systems have emerged from urban sewage and precipitation removal systems, to urban sewage and precipitation removal and cleaning systems. The challenge for the future is recovering energy and resources from sewage systems while maintaining/improving its sanitary service and lowering its emissions.

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