Damrongsat, Arrak, Kannitha Krongthamchat, and Somchai Dararat. “Using Zeolite and Ugraded Sand to Remove Ammonia Nitrogen From Swine Wastewater(Thai)”. Asia-Pacific Journal of Science and Technology 11, no. 4 (April 20, 2017): 311–318. accessed April 22, 2026. https://so01.tci-thaijo.org/index.php/APST/article/view/83984.