The study of Hydrilla (Hydrilla verticillata) effectiveness in water treatment was investigated using completely randomized designs with 4 Hydrilla densities: 0 (control) 30 50 and 70 plants. Each plot was experimented in round cement tanks added with sandy clay on the bottom. Fifty liters of canal water was then filled in. Along 6 weeks of the experiment each tank was aerated with no water exchanged. Results showed that there were no significant differences in values of temperature pH dissolved oxygen conductivity alkalinity hardness nitrite ammonia phosphate and biochemical oxygen demand in every treatment (p > 0.05). However the experimental plot with 50 hydrilla plants showed the best tendency in eradication of phosphate and improvement of biochemical oxygen demand at 86.00 and 45.73 percent respectively. On the other hand the experimental plot with 70 hydrilla plants showed the best tendency in eradication of ammonia and nitrite at 65.00 and 66.66 percent respectively.

The optimal pretreatment condition of coconut husk by physicochemical methods for biogas production was investigated. The coconut husk was dried and ground into powder (~0.1 nm) and was then determined for chemical contents such as cellulose hemi-cellulose and lignin respectively. The chemical contents of cellulose hemi-cellulose and lignin were 35.67±2.02 7.41±0.69 and 40.82±0.62 w/w respectively. After pretreatment with 4 different methods the results showed that the pretreatment of sodium hydroxide 30 % (w/w) gave the highest chemical contents of cellulose hemi-cellulose and lignin with 43.30±0.03 33.69±7.48 and 27.36±0.03 w/w respectively. As for the biogas production the result showed that the ratio of coconut husk to cow dung of 1:4 with C:N ratio of 23:1 gave the highest cumulative biogas of 442.6 ml for 30 days. Methane and carbon dioxide contents were 46.1 and 23.1 %. Moreover the removal percentages of the total solids (TS) volatile solid (VS) suspended solids (SS) and COD were 69.3 32.5 50.0 and 58.4 % respectively. The coconut husk could be used as an alternative material for the application of biogas production with cow dung in the near future.

This research aims to develop a web-based instruction (WBI) applied in the computer technology course. The proposed WBI composed of the following components: lessons of the computer technology course pre-test and post-test exam: determining the effectiveness of the proposed work and user satisfaction questionnaires. It is also evaluated a study achievement and a usage satisfaction by using efficiency and effectiveness test of lessons and satisfaction test of users. In this work users are the second year students in major of Computer Technology Faculty of Science and Technology Rajamangala University of Technology PhraNakhon for 30 students. For experiments the results show that its efficiency is 80.13/83.67 which are met studied the proposed WBI are also higher than students who studied with ordinary courses at the statistical significant level 0.05 furthermore an average of students’ satisfactions score is 4.20 which determines students satisfy with the proposed WBI at a high-level. Finally it can be concluded that the proposed WBI is effective

In this study pH physical and microbiological qualities of clear and opaque plastic bottled drinking water produced in Buriram Province Thailand were investigated. Samples of bottled drinking water (N=22) were 8 clear plastic bottles and 14 opaque plastic bottles. Results showed that pH value of all samples were in a range of 6.04 ± 0.03 to 7.61 ± 0.01 in which 7 samples were not acceptable according to the criteria for drinking water in sealed containers declared by the Ministry of Public Health of Thailand. Coliform bacteria in all tested samples were less than 1.8 MPN/100mL and none of E. coli was detected. Therefore consumers of bottled drinking water produced from Buriram province should be aware of health safety because some drinking water products were unacceptable in terms of pH value.

The objectives of this study were to investigate communities confidence in their local leaders the locals awareness and factors affecting peoples participation in the water quality management. Data were collected from interviewing 400 households and analyzed with a Logit model. Results showed that the samples were well aware of water quality problems. The communities confidence in their local leaders was in a middle level and the communities’ participation in common activities was low. Factors that affected communities participation in water quality management were confidence in local leaders membership of the conservation groups education level and awareness of water source problem respectively.