Clinoptilolite Adsorption Capability of Ammonia in Pig Farm

Abstract In this paper, clinoptilolite, as an adsorbing material, which adsorption capability of ammonia was studied. Clinoptilolite is a porous crystal material, which adsorption properties of clinotiolite are strongly related to the framework structure, which has performance for the physical adsorption and ion exchange. China is in rich of nature clinoptilolite, which is cheap and suitable for extensive application in pig house. The experiment indicated that clinoptilolite had a characteristic of “rapid adsorption, slow equilibrium”, it took 3 hours to reach adsorption equilibrium, clinoptilolite's particle size, moisture content and dosage had important effects on saturation adsorption time and ammonia adsorption capacity. With decreasing the particle size, clinoptilolite adsorption capacity increased, and the higher ammonia concentration, the better adsorption effect in the “rapid adsorption” phase. Different clinoptilolite's moistures also played an important role for adsorption effect, in the “rapid adsorption” phase, the effect was the best when moisture content of clinoptilolite was 40%; in the phase of “slow equilibrium”, wet clinoptilolite adsorption would be better than the natural, the rank was: 40% > 50% > 30% > 20% > 60% > the natural. By regression analyze, when moisture content was 42%, adsorption capability could be the best. Besides, clinoptilolite adsorption capacity was studied, per unit saturation adsorption capacity of 10 g nature clinoptilolite was 0.09 mg/g, 20 g nature clinoptilolite's was 0.13 mg/g. Therefore, it could be seen that increasing the amount of clinoptilolite would improve the total and units clinoptilolite adsorption capacity. Considering the significant sorption for ammonia, the method of clinoptilolite adsorption could be simple and economic, it should be foreseeable that clinoptilolite adsorption would have a good prospect for air purification in pig farm.