Solved upscaling problems for implementing deammonification of rejection water

2006 ◽  
Vol 53 (12) ◽  
pp. 121-128 ◽  
Author(s):  
B. Wett
Keyword(s):  
Nitrogen Removal ◽  
Metabolic Pathways ◽  
Energy Savings ◽  
Scientific Literature ◽  
Compressed Air ◽  
Successful Implementation ◽  
Design Capacity ◽  
Autotrophic Metabolism ◽  
Start Up ◽  
The Mean

So far, extremely efficient metabolic pathways for nitrogen removal exclusively by autotrophic organisms are well established in scientific literature but not in practice. This paper presents results from the successful implementation of rejection water deammonification in a full-scale single sludge system at the WWTP Strass, Austria. Anaerobic ammonia oxidising biomass has been accumulated during a 2.5 year start-up period when the reactor size was gradually scaled up in the steps. The pH-controlled deammonification system (DEMON) has reached a design capacity of eliminating approximately 300 kg of nitrogen per day. Energy savings outperform expectations, decreasing the mean specific demand for compressed air from 109 m3(kg N)−1 to 29 m3(kg N)−1. Dominance of autotrophic metabolism is confirmed by organic effluent loads topping influent loads.

scholarly journals Start-up Strategies for Anaerobic Ammonia Oxidation (Anammox) in In-Situ Nitrogen Removal from Polluted Groundwater in Rare Earth Mining Areas

2021 ◽  
Vol 13 (8) ◽  
pp. 4591
Author(s):  
Shuanglei Huang ◽  
Daishe Wu
Keyword(s):  
Rare Earth ◽  
Low Temperature ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Ex Situ ◽  
High Concentration ◽  
Low Concentration ◽  
Start Up ◽  
Anammox Activity

The tremendous input of ammonium and rare earth element (REE) ions released by the enormous consumption of (NH4)2SO4 in in situ leaching for ion-adsorption RE mining caused serious ground and surface water contamination. Anaerobic ammonium oxidation (anammox) was a sustainable in situ technology that can reduce this nitrogen pollution. In this research, in situ, semi in situ, and ex situ method of inoculation that included low-concentration (0.02 mg·L−1) and high-concentration (0.10 mg·L−1) lanthanum (La)(III) were adopted to explore effective start-up strategies for starting up anammox reactors seeded with activated sludge and anammox sludge. The reactors were refrigerated for 30 days at 4 °C to investigate the effects of La(III) during a period of low-temperature. The results showed that the in situ and semi in situ enrichment strategies with the addition of La(III) at a low-concentration La(III) addition (0.02 mg·L−1) reduced the length of time required to reactivate the sludge until it reached a state of stable anammox activity and high nitrogen removal efficiency by 60–71 days. The addition of La(III) promoted the formation of sludge floc with a compact structure that enabled it to resist the adverse effects of low temperature and so to maintain a high abundance of AnAOB and microbacterial community diversity of sludge during refrigeration period. The addition of La(III) at a high concentration caused the cellular percentage of AnAOB to decrease from 54.60 ± 6.19% to 17.35 ± 6.69% during the enrichment and reduced nitrogen removal efficiency to an unrecoverable level to post-refrigeration.

scholarly journals Energy savings in compressed air systems a case of study

2021 ◽  
Vol 1154 (1) ◽  
pp. 012009
Author(s):  
H Hernández Herrera ◽  
D Patiño Villalba ◽  
E Noriega Angarita ◽  
J I Silva Ortega ◽  
C A Caraballo Echavarría
Keyword(s):  
Energy Savings ◽  
Compressed Air

Procedural Automation of Ethane Recovery to Rejection in NGL Trains

2021 ◽  
Author(s):  
Subhendu Sengupta ◽  
Vincent Goveas
Keyword(s):  
Human Error ◽  
Continuous Process ◽  
Operating Cost ◽  
Operating Efficiency ◽  
Successful Implementation ◽  
Mode Change ◽  
Batch Operation ◽  
Training Tool ◽  
Gas Processing ◽  
Start Up

Abstract This paper is based on successful implementation of procedural automation of Ethane (C2) recovery - rejection mode change using Yokogawa's Exapilot software, wherein ADNONC Gas Processing Habshan 5 & Sulphur management approved the implementation based on similar success of the Sulphur Recover Unit start-up/shutdown procedural automation & company's drive for digitalisation. Scope was to develop modules for automating C2 Recovery /Rejection change over procedure in NGL unit using M/s Yokogawa Exapilot software. These automated procedures aimed to standardize said mode change over operations by incorporating the operating know how and the expertise of skilled-experienced operators into the Exapilot system as a set of Standard Operating Procedures (SOPs) that are executed in right operating sequence for enhanced operating efficiency. Two main procedures & associated modules were designed, engineered and built using Exapilot to enable single-click change over automation for NGL units. Those were validated with operation and deployed in the Exapilot Server and were integrated with the Operator Consoles (HIS) for access, and was supplemented with operator training. Ethane Recovery to Rejection Mode Change Ethane Rejection to Recovery Mode Change Besides standardization and reduced change over time, this improved the critical asset integrity and lifespan of NGL section equipment by advocating systematic operations. Following benefits including major take away from this project: ➢ Standardized the mode change-over procedures & minimized human error by the digitalization of paper documentation procedures into electronic workflow process. Procedural Automation like Exapilot is powerful tool for digital transformation of batch/discrete operation like unit/equipment start-up/shutdown or grade/mode change over. ➢ Reduced inherent delay due to manual change over. Hence, minimizing the loss-opportunities & operating cost. Besides this tool can be used as training tool (when used in offline mode) which help operator succession plan & effective knowledge transfer ➢ Automated critical operation such as temperature/flow ramping, improved equipment integrity and prolonged equipment life. Procedural Automation using Exapilot thus can improve operation efficiency, asset integrity, equipment or material life span This paper presents a success story of procedural automation of batch operation in continuation of similar success in SRU start-up & shutdown automation. This tool along with proper integration work with DCS, has opened door for automation/digitalization in batch operation in continuous process not only in other sites of ADNOC Gas Processing and other ADNOC Group Companies but also in other industries that helps companies to enhance efficiency and fulfil their digitalization journey. Though Exapilot software belongs to M/s Yokogawa, however other DCS systems have similar software such as Honeywell DCS EPKS has E-procedure for procedural automation.

Design Optimization of Ultra-Low Flying Head-Disk Interfaces Using an Improved Elastic-Plastic Rough Surface Model

2006 ◽  
Vol 128 (4) ◽  
pp. 801-810 ◽  
Author(s):  
Allison Y. Suh ◽  
Sung-Chang Lee ◽  
Andreas A. Polycarpou
Keyword(s):  
Rough Surface ◽  
Contact Pressure ◽  
Surface Model ◽  
Successful Implementation ◽  
Contact Conditions ◽  
Friction Forces ◽  
Interfacial Forces ◽  
Elastic Plastic ◽  
The Mean ◽  
Improved Model

Sub-5nm flying head-disk interfaces (HDIs) designed to attain extremely high areal recording densities of the order of Tbit∕in2 are susceptible to strong adhesive forces, which can lead to subsequent contact, bouncing vibration, and high friction. Accurate prediction of the relevant interfacial forces can help ensure successful implementation of ultra-low flying HDIs. In this study, an improved rough surface model is developed to estimate the adhesive, contact, and friction forces as well as the mean contact pressure relevant to sub-5nm HDIs. The improved model was applied to four different HDIs of varying roughness and contact conditions, and was compared to the sub-boundary lubrication rough surface model. It was found that the interfacial forces in HDIs undergoing primarily elastic-plastic and plastic contact are more accurately predicted with the improved model, while under predominantly elastic contact conditions, the two models give similar results. The improved model was then used to systematically investigate the effect of roughness parameters on the interfacial forces and mean contact pressure (response). The trends in the responses were investigated via a series of regression models using a full 33 factorial design. It was found that the adhesive and net normal interfacial forces increase with increasing mean radius R of asperities when the mean separation is small (≈0.5nm), i.e., pseudo-contacting interface, but it increases primarily with increasing root-mean-square (rms) surface height roughness between 2 and 4nm, i.e., pseudo-flying interface. Also, increasing rms roughness and decreasing R, increases the contact force and mean contact pressure, while the same design decreases the friction force. As the directions of optimization for minimizing the individual interfacial forces are not the same, simultaneous optimization is required for a successful ultra-low flying HDI design.

Die deutsche Gründerlandschaft im Energiesektor und ressourcenbedingte Voraussetzungen für eine Gründungsfinanzierung eines Energie-Startups

2020 ◽  
Vol 68 (3-4) ◽  
pp. 169-189
Author(s):  
Theresa Fritz ◽  
Wolfgang Burr
Keyword(s):  
Human Capital ◽  
Scientific Literature ◽  
Empirical Studies ◽  
Organizational Level ◽  
Team Members ◽  
Start Up ◽  
Utility Models ◽  
The Individual ◽  
Technological Capital ◽  
Start Ups

Zusammenfassung Empirische Untersuchungen zur Gründungslandschaft der deutschen Energiewirtschaft sind in der wissenschaftlichen Literatur bisher unterrepräsentiert. Im Zuge einer explorativen Darstellung von deutschen Energie-Startups wird zu Beginn ein Überblick über die Gründungsbereiche, die Gründungsteams sowie die finanzielle Lage von 126 deutschen Energie-Startups gegeben. Mithilfe einer Regressionsanalyse werden im nächsten Schritt die Einflüsse von Humankapital und technologischen Ressourcen auf die Akquise von Finanzierungsmitteln überprüft. Im Rahmen der Auswertung kann ein signifikanter Zusammenhang zwischen der Anzahl der Gründer, den individuellen Fähigkeiten der Teammitglieder sowie der Anzahl der Patente und Gebrauchsmuster auf die Akquise von Finanzierungsmitteln nachgewiesen werden. Dies legt den Schluss nahe, dass die Kombination der beiden Ressourcen Humankapital und technologisches Kapital den Aufbau von Kompetenz bei der Finanzierungsmittelakquise auf organisationaler Ebene begünstigen und zum Wachstum des Startups beitragen können. Abstract Empirical studies on the start-up landscape of the German energy industry have so far been underrepresented in the scientific literature. In the course of an exploratory presentation of German energy start-ups, an overview of the start-up areas, the founding teams and the financial situation of 126 German energy start-ups is given at the beginning. In the next step, a regression analysis is used to examine the influence of human capital and technological resources on the acquisition of funding. As part of the evaluation, a significant relationship between the number of founders, the individual skills of the team members and the number of patents and utility models on the acquisition of funding can be demonstrated. This suggests that the combination of the two resources human capital and technological capital can facilitate the development of skills in the acquisition of funding at the organizational level and contribute to the growth of the start-up.

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