Zig zag Brick kiln—A positive step towards carbon emission  in Bangladesh

Carbon-di-oxide is the main culprit for carbon emission which leads to climate change & environmental pollution in a country. Bangladesh is most vulnerable to climate change & environmental pollution due to huge amount of carbon emission in the atmosphere. There are several factors responsible for carbon emission.  Brick kiln is one of them which emits a huge amount of  carbon-di-oxide gas in the atmosphere of the country. The Bull Trench Kilns had the largest market share for long one hundred & fifty years. Then comes the Fixed Chimney kilns (FCK).There are other brick kilns like Zigzag kilns, gas fired Hoffman kilns (HK) and Hybrid Hoffman kilns (HHK) to produce bricks. One study reveals that in 2006, market share for different brick kilns in Bangladesh was FCK-75.4 per cent, BTK-19.2 per cent, Zigzag kiln-4.8 per cent and HK-0.6 per cent. Though Hybrid Hoffman kiln & tunnel kiln are the latest kilns technology to produce bricks, yet Zig zag technology  is the pioneer  because Zigzag kilns are comparatively better in terms of fuel use and carbon emission.  Both BTKs and FCKs are poorly constructed and cause excessive leakage through the kiln walls. The conventional BTK and FCK consume huge amount of fuel but fail to utilize the effective heat energy for burning bricks. In the back drop of the present context, remission of carbon emission is a vital issue for ecological balance. In the mean time, the Bull Trench Kilns (BTK) & the Fixed Chimney kilns (FCK) have lost their appeal. It is estimated that a Fixed chimney (with 120 ft stack height) brick kiln (BTK requires almost the same) requires approximately 4-5 acres of land including around 2 acres for the kiln itself to install and operate. The gas fired Hoffman kilns and Hybrid Hoffman kilns are comparatively new addition in this country and they operate round the year. As the utility companies discourage gas supply to brick kilns, a limited number (approximately 30) of gas fired Hoffman kilns operate in the country and they are mainly established in and around Dhaka. The Tunnel kiln has no market share in our country because it has not become popular so far. The Zig zag kiln is the most prominent kiln technology in term of  fuel consumption &  carbon emission though its heat insulation system generally is not significantly better than FCK.