Biomedical subjects

J Kruit

Publications and source records attributed to J Kruit.

3 recordsLinked to original sources

PubMed2002

A practical protocol for dynamic modelling of activated sludge systems.

Use of dynamic simulation models has become standard practice in The Netherlands. Since the introduction around 5 years ago more then 100 full scale wastewater treatment plants have been modelled. Initially very different approaches have been used varying in calibration approach, amount of sampling and time investment. Based on the accumulated practical experiences the Dutch Foundation of Applied Water Research STOWA has stimulated the development of a protocol to aid in the set-up and calibration of models for full scale wastewater treatment plants. Herein the aim was to develop a protocol, which in practice was easy to use, minimising time and costs effort, but give a reliable and useable method. In this paper this protocol is briefly described.

Calibration↗

PubMed2002

Bulking sludge solved?!

At present there is still no final theory explaining the bulking of activated sludge. Previous investigations showed that the sludge settling properties become better and more stable when more plug flow conditions are implemented in wastewater treatment plants for biological nutrient removal. In this research the effect of the process configuration (4 wwtp with fully biological nutrient removal) on the sludge settling properties has been investigated. The results show that a separate anoxic reactor can not avoid the presence of LCFA for the growth of M. parvicella in the anaerobic reactor. A SVI < 120 ml/g could be achieved by: of a separate anoxic reactor with plug flow conditions, introducing of a strictly anaerobic reactor (UCT-modification), implementation of an extra anoxic/aerobic reactor, maintaining a high oxygen concentration (> 1.5 mg/l) and creating a low ammonium concentration (< 1 mg/l) in the aerobic reactor.

Actinobacteria↗

PubMedDate not supplied

Body-powered hand prosthesis with low operating power for children.

For unilateral below-elbow amputated children a new elbow-controlled hand prosthesis has been developed. Since the triceps of young children have insufficient power to activate normal spring-closing hands, a special mechanism with low operating power has been developed for this prosthesis. A stiff spring gives a good gripping force. When the elbow is slightly extended this spring is switched off, and by further extension the hand is opened against a weak spring. So far, six children have used this special prosthesis. Their initial enthusiasm resulted in an improved system, which is now being designed.

Artificial Limbs↗