Evaluating the primary and ready biodegradability of dianilinodithiophosphoric acid

Abstract

Dianilinodithiophosphoric acid (DDA) is widely used as sulfide mineral flotation collector in China. It is necessary to investigate the biodegradability of DDA to provide the fundamental knowledge to assess the environmental fate in the risk assessment of DDA and to design and operate the DDA flotation wastewater biological treatment plant. In the present study, the primary and ready aerobic biodegradations of DDA were studied and the primary biodegradation kinetic model of DDA was developed. The results show that DDA displays a good primary biodegradability and its biodegradation ratio reaches 99.8 % in 7 days. In contrast, DDA is not easily ready biodegradable; hence, it is a partially biodegradable organic compound. The primary aerobic biodegradation kinetics can be described using the first-order reaction kinetics equation: C = 19.72191e(-0.01513t).

Recent advances in the treatment and recycling of mineral processing wastewater

“…DDPA exhibited excellent properties of primary biodegradability (99.8% in 7 days), while the ready aerobic biodegradation test showed it is not ultimately biodegradable. 62 It is hypothesized that DDPA is adsorbed by activated sludge and then biodegraded by microbes, as illustrated in Fig. 5.…”

Facile synthesis of a cardanol‐based levelling agent as a biodegradable alternative to tristyrylphenol ethoxylates for the dyeing of polyester fabric

“…The biodegradability of the surfactant was evaluated according to GB/T 15818-2006 (Test method for biodegradability of surfactants), which was established based on ISO 7827-1984 (Water quality -Evaluation in an aqueous medium of the aerobic biodegradability of organic compounds). [35][36][37] Linear polyoxyethylene dodecanol was adopted as a reference. Next, 15 g/L of sludge was prepared as the biodegradable source.…”