scholarly journals Preliminary project design for insect production: part 3 – sub-process types and reactors

2021 ◽  
pp. 1-16
Author(s):  
R. Kok
Keyword(s):  
Plug Flow ◽  
Project Design ◽  
Larval Rearing ◽  
Insect Larvae ◽  
Operational Approach ◽  
Reactor Configuration ◽  
Key Aspects ◽  
Production Part

This is a discussion about sub-processes suitable for the rearing of insect larvae on dry and semi-dry feeds. Three closely related, key aspects are dealt with as part of preliminary project design (PPD): the type of larval rearing sub-process to be employed, the reactor configuration and the operational approach to be used. A number of sub-process types and reactors are discussed. Because they are most commonly used in the industry today, all the sub-processes are ‘plug-flow’ (age stratified) and based on ‘passive’ reactors (contents moving through the reactor). Batch, semi-continuous as well as continuous sub-processes are dealt with and illustrated. Simulation to help the entopreneur chose the most appropriate type of sub-process is highly recommended.

scholarly journals Preliminary project design for insect production: part 2 – organism kinetics, system dynamics and the role of modelling & simulation

2021 ◽  
pp. 1-14
Author(s):  
R. Kok
Keyword(s):  
Operating Conditions ◽  
Design Stage ◽  
Project Design ◽  
Specific System ◽  
Simulation Based ◽  
Possibility Space ◽  
Formal Design ◽  
Parameter Values ◽  
Production Part

During preliminary project design (PPD) an entopreneur can investigate a variety of process types, organism/feed combinations, operating conditions and procedures, control approaches, etc. before deciding on a specific system arrangement and proceeding to a more formal design stage. With modelling and simulation the effort required to locate a high-value point within the overall possibility space for a system can be greatly reduced because much of the development work can be carried out in a virtual environment. Nevertheless, to formulate models of the organism/feed kinetics as well as other system aspects, this approach must be based on experimental data. And, of course, results of a simulation study must be verified empirically. A simulation-based approach to PPD allows an entopreneur to study the dynamics of a wide variety of system arrangements and to gain insight into how a given arrangement is likely to perform with different parameter values and disturbances.

scholarly journals Preliminary project design for insect production: part 4 – facility considerations

2021 ◽  
pp. 1-12
Author(s):  
R. Kok
Keyword(s):  
Low Cost ◽  
Project Design ◽  
New Production ◽  
Building Envelopes ◽  
Disease Evolution ◽  
Project Location ◽  
Clear Idea ◽  
Integrated Or ◽  
Design Construction ◽  
Production Part

At the end of the preliminary project design (PPD) phase an aspiring entopreneur should have a clear idea of the scope and scale of the project being proposed. Hence, during PPD a number of aspects of the facilities must be considered. These are here dealt with in terms of basic questions that should first be answered about the project as a whole; project location issues; to what degree the facility is to be integrated or segregated into different units; what functionality is to be housed within the various building envelopes; and how safety and hygiene concerns can be addressed. As well, three ancillary issues are discussed that may affect facility design, construction and operation: the development of new production organisms that can grow on low-cost feeds; the possibility of disease evolution; and the matter of animal welfare.

The effect of reactor configuration and operational mode on Microthrix parvicella bulking and foaming in nutrient removal activated sludge systems

2002 ◽  
Vol 46 (1-2) ◽  
pp. 61-64 ◽  
Author(s):  
C. Noutsopoulos ◽  
D. Mamais ◽  
A.D. Andreadakis
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Plug Flow ◽  
Selective Advantage ◽  
Operational Mode ◽  
Intermittent Aeration ◽  
Reactor Configuration ◽  
Microthrix Parvicella ◽  
Activated Sludge Systems ◽  
Removal System

Three bench-scale nutrient removal activated sludge units were used to examine the effect of the reactor configuration and the intermittent aeration mode on the growth of Microthrix parvicella. According to the results, the plug flow configuration seems to achieve satisfactory Microthrix parvicella control. The imposed concentration gradient for both RBCOD and SBCOD creates a selective advantage for the floc forming bacteria throughout the system (both the anoxic and oxic zones) and limits Microthrix parvicella growth. In terms of the operational mode, the intermittent aeration CSTR nutrient removal system promotes the growth of M.parvicella and deteriorates the settling characteristics of the activated sludge.

Key Aspects of Project Design for Polymer Flooding

2007 ◽  
Author(s):  
Dongmei Wang ◽  
Randall Scott Seright ◽  
Zhenbo Shao ◽  
Jinmei Wang
Keyword(s):  
Polymer Flooding ◽  
Project Design ◽  
Key Aspects

ESEA Title III Project Design for Language-Handicapped Kindergarten and Preschool Children

1973 ◽  
Vol 4 (4) ◽  
pp. 174-181
Author(s):  
Marilyn J. Click ◽  
Jerrie K. Ueberle ◽  
Charles E. George
Keyword(s):  
Preschool Children ◽  
Project Design ◽  
Title Iii

An Operational Approach to Record Linkage

1983 ◽  
Vol 22 (02) ◽  
pp. 77-82 ◽  
Author(s):  
M. P. Mi ◽  
J. T. Kagawa ◽  
M. E. Earle
Keyword(s):  
Decision Making ◽  
Record Linkage ◽  
Operational Approach ◽  
Resident Population ◽  
Rate Of Failure

An operational approach to computerized record linkage has been developed based on the concept of probability of chance match in two groups of records brought together for comparison. Tolerance levels can be readily derived from these records for decision-making in accepting or rejecting a linked pair. This approach is especially suitable for iteration when linked pairs are removed in successive cycles. An application of linkage for death clearance of the 1942 resident population of 437,967 registered in Hawaii during a 38-year period from 1942 to 1979 is presented. The reliability of linkage and rate of failure were analyzed.

Web-Based Financial Reporting: An Interpretative Model for Corporate Communications on Social Media

2017 ◽  
pp. 79-112
Author(s):  
Paola Ramassa ◽  
Costanza Di Fabio
Keyword(s):  
Social Media ◽  
Financial Reporting ◽  
Building Blocks ◽  
Corporate Communications ◽  
Distinctive Features ◽  
Financial Communication ◽  
Use Of Social Media ◽  
Key Aspects ◽  
And Diffusion ◽  
Interpretative Model

This paper aims at contributing to financial reporting literature by proposing a conceptual interpretative model to analyse the corporate use of social media for financial communication purposes. In this perspective, the FIRE model provides a framework to study social media shifting the focus on the distinctive features that might enhance web investor relations. The model highlights these features through four building blocks: (i) firm identity (F); (ii) information posting (I); (iii) reputation (R); and (iv) exchange and diffusion (E). They represent key aspects to explore corporate communication activities and might offer a framework to interpret to what degree corporate web financial reporting exploits the potential of social media. Accordingly, the paper proposes metrics based on this model aimed at capturing the interactivity of corporate communications via social media, with a particular focus on web financial reporting. It tries to show the potential of this model by illustrating an exploratory empirical analysis investigating to what extent companies use social media for financial reporting purposes and whether firms are taking advantage of Twitter distinctive features of interaction and diffusion.

Pilot trials of hemicelluloses extraction prior to thermomechanical pulp production: Part 1

TAPPI Journal ◽  
2011 ◽  
Vol 10 (5) ◽  
pp. 21-28 ◽  
Author(s):  
CARL HOUTMAN ◽  
ERIC HORN
Keyword(s):  
Oxalic Acid ◽  
Energy Savings ◽  
Wood Chip ◽  
Strength Properties ◽  
Thermomechanical Pulp ◽  
Sugar Solution ◽  
Bisulfite Treatment ◽  
Pilot Trials ◽  
Pulp Production ◽  
Production Part

Pilot data indicate that wood chip pretreatment with oxalic acid reduced the specific energy required to make thermomechanical pulp. A combined oxalic acid/bisulfite treatment resulted in 21% refiner energy savings and 13% increase in brightness for aspen. A low level of oxalic acid treatment was effective for spruce. Energy savings of 30% was observed with no significant change in strength properties. Adding bisulfite did not significantly increase the brightness of the spruce pulp. For pine, the optimum treatment was a moderate level of oxalic acid, which resulted in 34% energy savings and an increase in strength properties. For all of these treatments 1–3 w/w % carbohydrates were recovered, which can be fermented to produce ethanol. The extract sugar solution contained significant quantities of arabinose.

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