Experimental study on application of a new charging flocculation agent for catfish farming water treatment in Vinh Long province

Abstract

The charging flocculation agent “Kiyomaru” is a natural inorganic substance produced from volcanic ash (“Shirasu”) by calcining it in the special firing furnace to generate high porosity, then applying a strong electric charge to some substances included in the ingredient of “Shirasu” by special processing. “Kiyomaru” consists of 24.7 % Na, 11.5 % Al, 19.6 % Si, 22.5 % S, 1.8 % K, 19.0% Ca, 09% Fe, which can consider as an ecological water depurative, having rapid rate of flocculation and sedimentation, cheaper facility cost, simplification of post-processing sludge, low cost and high performance, overwhelming flocculation capacity. Apart from effective treatment of the waters contaminated with high content of suspending solid (up to 10,000 ppm), the agent can remove some heavy metals such as Fe, Mn, As, etc., odour and some organic substances (COD). From 2013 to the present, Environmental Technology Center (ENTEC) in cooperation with HALVO Company Ltd. and Japan Port Consultants Ltd. funded by the Department of Science and Technology of Vinh Long prpvince have implemented the study on experiemental study on application of “Kiyomaru” for catfish farming water treatment in Vinh Long province. The obtained results shown that when using the “kiyomaru”, the efficency of color, turbidity, suspended solid and iron removal as well as the rate of coagulation and sedimentation are generally higher than those comparing with the traditional coagulants.