? Design, construction and operation of brick kilns under VSBK model achieved positive results on the heat saving, reducing the flow of smoke. The bricks are of high quality with reasonable cost of investment, the labor conditions of the workers operating the furnace is much improved compared to the traditional brick kiln.
? Compared to tunnel brick kilns and traditional brick kilns, the rate of energy consumption of VSBK is very low, only 56% compared to traditional brick kilns and 77% compared to tunnel brick kiln, thus saving 44% compared to the traditional brick kiln and 23% compared to the tunnel brick kiln.
? Using VSBK to produce 3.886 million bricks / year will save 256.2 tons of coal and 7.7 tons of firewood in one year compared to the use of traditional brick kilns with the same produced number of bricks. Therefore will reduce 462.25 tones of CO2 emission per year and 1.65 tones of harmful emission of SO2 per year into the environment. The saving from reducing fuel would be 75.8 million VN? for coal and 4.6 million VN? for firewood.
? To produce the same amount of bricks, fuel consumption of traditional kilns is 1.76 times higher compared to VSBK kiln. Amount of fuel gas generated by burning one brick from traditional kiln larger than 3.39 times VSBK kiln. Emission of SO2, CO2 (kg / s) of traditional kiln is more than 3 times VSBK kiln, though the brick production in 1 day of VSBK kiln is higher from 2.6 to 3.3 times the traditional kiln (due to continuous operation) and the amount of fuel burned at the same time much lower. CO2 emission of the tunnel kiln about 5.86 times higher than VSBK kiln and SO2 emission about 12.2 times higher than VSBK kiln, while the tunnel kiln capacity only 2.2 times higher than VSBK kiln. Smoke emission of traditional kiln is 5.77 times the VSBK kiln's . If put in the same capacity, traditional kiln smoke emission is 13.6 to 19 times of the VSBK kiln's . Amount of ash emitted by burning the same amount of traditional brick kiln's five times the VSBK kiln's. According to the Center for treatment of environmental (Ministry of Commands on Chemical), manufacturing of VSBK kiln results in 40-45% reduction in coal consumption compared to traditional brick kiln, so the emission into the environment decreased 40-45%, respectively; average CO concentration on the kiln (233mg/m3) was lower than the allowed limit of TCVN 5939-1995 (500mg/m3), only 12% of the average CO concentration compared to the traditional kiln (1990mg/m3); NOx, SO2, CxHy and dust index are within the limit of environmental standard allowance and much lower than the traditional brick kilns. In the Working conditions in the brick kilns, the concentration of toxic gas are within the prescribed limits of the national TCVN Standard.
? Ceramic quality is quite good (the M75 grade according to TCVN 1451-1998) with unconfined compressive strength is 7.9N/mm2 while with handmade bricks in the Xuan Quan, unconfined compressive strength of just 6.2N/mm2 (achieve grade M50). Water absorption is 12%, lower than the traditional kilns (14.4%), which displays VSBK baked at a higher temperature. Compared to the same conditions of materials and equipment, brick created by VSBK have more uniform size and higher compressive strength compared to traditional brick kiln.
? Based on the results of the economic analysis and comparison with traditional kilns, the level of investment for VSBK is acceptable to brick kiln owners, significantly reducing fuel costs. Based on the calculation, profit rates in 5 years of VSBK always higher than traditional brick oven. Because brick yield of VSBK is higher than traditional kiln's, should VSBK also more sensitive to the changes. So using VSBK requires higher management level employees, product quality and market access to ensure maximum profit.
? Experience from building model VSBK have been summarized and shared in the scientific conferences organized by the project. The workshop attracted the participation of the State management agencies from the Government, the relevant departments of Hung Yen province and other provinces in the country and the mass media.
? The communication activities of the project has attracted the attention of the mass media of the central and provincial levels of Hung Yen and facilitate the replication of project. Project also introduced about VSBK at the exhibition of scientific and technological achievements of the Ho Chi Minh Communist Youth Union at Giang Vo, Hanoi, and won the first prize. At the exhibition of achievements in science and technology at universities and colleges nationwide by the Ministry of Education and Training organization, VSBK be noticed and appreciated.
? The project contributed to raising awareness of the participants and beneficiaries of the project on environmental issues, the Global Environment Facility and The GEF Small Grants Programme.
? The brick kiln owners have learned new techniques of VSBK and has made innovations in the production process, contributing to the success of the construction and operation model VSBK of the project.