Design of a combined ozone/electron beam process for waste water and economic feasibility of the process

A design of a combined ozone/electron beam irradiation process for treating a 50 m³/h waste water stream from a molasses processing is discussed. Moreover, a cost evaluation of such a process in comparison to a conventional ozonation/biology treatment process has been performed to assess the potential of the irradiation process for technical use. Although the result of this comparison is not bad for the irradiation process an implementation into a full scale plant would not seem to be the thing to do in the present case.     

The operational benefits of integrated PC control of gamma irradiation plants

Compared with the traditional PLC control systems used on many gamma irradiation plants, the semi-intelligent decision making capabilities of a fully integrated PC control system can bring many benefits to the plant operator.

The authors will describe how plant operation is fully automatic with the PC control providing all the input-output data required to run the plant efficiently and safely. Detailed product tracking, with live on-screen data, can be incorporated to give both plant operator and product manufacturer complete confidence in the irradiation process. Advanced features such as on-line diagnostics and mechanical part failure prediction are also described.

Also available is automated dosimetry, reducing the opportunity for human error, whilst at the same time saving on staff costs and providing highly professional dose validation reports and comprehensive routine dosimetry documentation.

The benefits of PURIDEC's PC control system are not only available with its new plants. The system can be supplied as an upgrade to plants of all ages and design giving the current operator all the benefits described in the paper.     

Preparation of modified monomer and studies on EB radiation curing of polyurethane-acrylate in the air

Preparation of the monomer modified by phosphite is described. According to the results of IR, MS and ¹H-NMR, the possible synthesis path was deduced. The coating was made up of polyurethane acrylate, modified monomer, active diluent and so on. A non-tacky transparent film can be obtained after EB curing in the air. The experiment indicated that the modified monomer plays a great role in resisting oxygen inhibition. Furthermore, it reduces the radiation dose that the curing needs, and takes effect on radiation sensitization. The optimum radiation condition is 40 KGy. The gel content was used to express the curing extent and the relationship between dose and P-H bond conversion was studied.