Benzalkonium chloride (BKC) is a commonly used algaecide for aquaculture in Tainwan. The dynamic behavior of BKC with different alkyl chain length (C_12, C_14) were studied in this report. The experiments were conducted in 1.2 t FRP tanks. Each tank was filled with 500 liter of water. THee tanks were then treated with 1.5x10~-6 or 2.0x10~-6 BKC(C_12:C_14=3:2) and the decline of BKC in the water was investigated. The concentration of the C_14-BKC diminished very rapidly to undetecable value wihtin 1 h while the C_12-BKC had residence time around 1approx3 d for the filtered water samples. For the unfiltered samples, residence times of C_12-BKC wee longer than those of C_14 homolog in general. It is concluded that the added BKC associates with algae or particulates in water rapidly and causes the concentration of free-BKC decreased. This process for C_14-BKC is much faster than that for C_12-BKC. Both types of BKC degrade much slower than the rate estiated fromthe decrease of free-BKC in water.
展开▼
