Principles and potential of the anaerobic digestion of waste-activated sludge

Additive manufacturing (AM) alias 3D printing translates computer-aided design (CAD) virtual 3D models into physical objects. By digital slicing of CAD, 3D scan, or tomography data, AM builds objects layer by layer without the need for molds or machining. AM enables decentralized fabrication of customized objects on demand by exploiting digital information storage and retrieval via the Internet. The ongoing transition from rapid prototyping to rapid manufacturing prompts new challenges for mechanical engineers and materials scientists alike. Because polymers are by far the most utilized class of materials for AM, this Review focuses on polymer processing and the development of polymers and advanced polymer systems specifically for AM. AM techniques covered include vat photopolymerization (stereolithography), powder bed fusion (SLS), material and binder jetting (inkjet and aerosol 3D printing), sheet lamination (LOM), extrusion (FDM, 3D dispensing, 3D fiber deposition, and 3D plotting), and 3D bioprinting....

Polymers for 3D Printing and Customized Additive Manufacturing

Discrete particle simulation of particulate systems: A review of major applications and findings

Pretreatment methods to improve sludge anaerobic degradability: a review.

Nanosizing--oral formulation development and biopharmaceutical evaluation.

Fundamentals.- Flow properties of bulk solids.- Practical determination of flow properties.- A more detailed look at properties of bulk solids.- Discussion of testers and test procedures.- Properties exhibited by some bulk solids.- Examples of measured flow properties.- Stresses.- Silo design for flow.- Silo configurations.- Discharge of bulk solids.- Segregation.- Silo quaking and silo honking.- Sample problems and solutions.

Powders and bulk solids : behavior, characterization, storage and flow

The author was asked by the International Fine Particle Research Institue (IFPRI) to write a cri- tical review on shear testers for IFPRI-members. The re- view was delivered to IFPRI in summer 1999. Following the contract with IFPRI it was not allowed to publish the review elsewhere for at least two years. Granular Matter invited the author to submit the review in the original form; during the refereeing process (besides other chang- es) it turned out that some remarks should be added here for clarification: - Since 1999, the author is not aware of a really new device for testing bulk solid properties, which could lead to a change of the general comments and con- clusions provided in the review. - It was argued, that the review is referring too much to the work of Jenike, while the works of Johanson and Peschl were not adequately cited. Both are excellent en- gineers with a lot of experience, but their basic ideas are not available in published form, and if, they are not set in relation to alternative approaches so that an objec- tive comparison in detail would be a future research issue rather than a topic in this report. - A discussion on the influence of electrostatic char- ges was missing. There hardly is an influence, since the particles are in continuous contact. Only with non-con- ducting plastic particles electrostatic charges could cause problems. But no relevant experiments and results are known. In closed systems, the effect of electric charges is thus mainly neglected, but it is clear that electrostatic forces are eminent in flows with a free surface - an issue not addressed in this review.

/pdf/review-on-testers-for-measuring-flow-properties-of-bulk-pq7ip99ye5.pdf

Jörg Schwedes

Papers

Powders and bulk solids : behavior, characterization, storage and flow

Review on testers for measuring flow properties of bulk solids

Mechanical production and stabilization of submicron particles in stirred media mills

Disintegration of sewage sludges and influence on anaerobic digestion

Nanomilling in stirred media mills