Ammonia removal from giant fresh water prawn farm by using zeolite from oil palm ashRewadee Anuwattana, Pattamaphorn Phungngamphan, Patthanant Natpinit, Narumon Soparatana, Worapong Pattayawan and Supinya YindeeMATEC Web Conf., 192 (2018) 03028DOI: https://doi.org/10.1051/matecconf/201819203028