The aim of this research is to study with the limited pollution from Robusta coffee grinding process. The pollution behavior is used to design the limited pollution unit by consists of the dry and wet limited pollution unit. By the dry limited pollution unit tangential air cyclone was regarded. In term of the wet limited pollution unit has to 3 chambers by semi-wet chamber wet storage chamber and overflow chamber. However the efficiency of the limited pollution unit another pollution and economic engineering were determined. The results of research found that the rate of coffee grinding was 243 kg/hr and the mass of pollution was 37.3 to 41.9%. By the motion of pollution was projectile with the speed approximate 14.7 m/s and the distance of pollution was 5.25 m. Based on the dry limited pollution unit designed the efficiency of limited pollution just 79.25%. While the wet limited pollution unit can be limited to 100%. The tendency of pH of water in the wet limited pollution unit was increased to pH9 under past in 24 hours. In case of the break-even point must be grinding with 1400473 kilograms and payback period will occur at 2.1905 years.

The effect of grinding on the chemical and physical properties of rice husk ash was studied. Four rice husk ashes with different finenesses i.e. coarse original rice husk ash (RHA0) RHA1 RHA2 and RHA3 were used for the study. Ordinary Portland cement (OPC) was partially replaced with rice husk ash at 20% by weight of binder. The water to binder ratio (W/B) of the mortar was maintained at 110%±5% with flow table test. Specific gravity fineness chemical properties compressive strength and porosity test of mortars were determined. The differences in chemical composition of the rice husk ashes with different finenesses from the same batch are small. The use of RHA3 produces the mortars with good strength and low porosity. The strength of the mortar improves with partial replacement of RHA3 in comparison with normal coarse rice husk ash. The use of RHA3 results in a strong and dense mortar which is due to the better dispersion and filling effect as well as an increase in the pozzolanic reaction.

The reduction of calcium carbonate (CaCO3) particle was prepared by wet grinding method with 40% dispersion. The particle sizes of CaCO3 were studied with various time of wet grinding. It was found that the particle sizes of CaCO3 rapidly decreased in 3 day of grinding after that it was slightly reduce. Therefore the CaCO3 at various time of wet grinding were mixed with concentrate latex (60% dry rubber content DRC). The result showed that the wet grinding for 2 days provided the superior machanical properties. In addition the compound with epoxidized natural rubber (ENR) as a coupling agent was investigated. It was found that the 5 phr of 30% mole percent of ENR results in significantly improved mechanical properties of the rubber vulcanizates.