Dr Jean-Luc Kouyoumji, Dr Eric Heisel, Luis Lopez
Contd from previous issue
In practice, those conditions are rarely encountered due to the complexity of the operative conditions and the safety protections for the workers, that leads to attacks of poles by those destroying biological agents, as we noticed. Those biocides are not fast acting, that is a drawback for poles in use. Such behavior is necessary to protect bamboo from beetles and termites attacks.
Ideally, treatment product must:
(1) Penetrate entirely the bamboo walls.
(2) It has to be toxic (efficient) to act like a killer for insects
(3) Its repellent effect is a “plus”
(4) It has to stay in the material, non-leachable.
(5) In addition, products must be safe for the workers during implementation and for the house owners
(6) Finally, the treatment and the treated bamboo has to be safe for the environment
At the start of the project we performed tests at the FPRDI laboratory in Los Bagnos, in the Philippines. We tested the Toxicity of different chemicals/products by topical application method. The topical application method is one of the standard methods of insecticide testing that gives the relationship between dosage and the response of test insects.
Measurements were performed on powder post beetles (D. minutus), subterranean termites (M. losbanosensis) and drywood termites (C. dudleyi). 100% of death was recorded after 10 min for some organic insecticides whereas traditional products were recording 10% of death. For building applications, such a small rate of efficiency is unacceptable.
From the wood industry knowhow we looked for a preservative which will suit the needs. For instance, the repellent effect of the insecticide is a characteristic that enhances the global efficacy of the perseverative. Traditional treatment products are not repellent. they are very leachable, they are usually salts, fixation is therefore very poor. Salts are leached out during storage and building phases. They can also be leached out when into service, in tropical climates.
All the methodology was guided by European regulation and procedures described in European (EN) or International (ISO) standardization. Association Bambou Sciences et Innovations // Bamboo Sciences and Innovations Research Centre SIRET : 530 846 468 00011 --- APE : 7219Z (08/08/2007) 14 rue André Messager, 33 520 Bruges, France Tél. +33 952 52 36 38; Cel. +33 6 08 74 36 38, [email protected]
Development of an innovative Bamboo Treatment
A valid alternative for Bamboo Treatment was developed by BSInnovations scientists, in 2015. Different technologies of preservatives and treatment processes were tested. The treatment is implemented by soaking - diffusion methodology. The procedure is composed of 15 necessary steps to be followed.
For this work, our core values are:
(1) safety for workers and users,
(2) security for the environment,
(3) efficiency of the treatment.
The efficiency comes in the third position of importance, for us safety and security are not to be of any discussion.
Safety and environment risk
Challenge was to protect workers and the environment. Workers must be protected from direct contact with solution, for that workers were trained for safety, during treatment implementation they wear security equipment, and in case of accidental splashes, there are emergency devices to wash out products. Also, a complete shower on site near the treatment tank was implemented, as European regulations require. To be contd