Papers by Keyword: Peracetic Acid

Abstract: Sewage sludge is difficult to degrade in anaerobic digestion systems and pretreatments have been shown to speed up the hydrolysis stage. In this paper sludge anaerobic digestion experiments with peracetic acid as a pretreatment were carried out and the effects of acid pretreatment using peracetic acid on subsequent digestion were investigated. It has been proved that this treatment effectively leads to a solubilisation of organic material and thus leads to a increase of soluble chemical oxygen demand (SCOD) and volatile fatty acids (VFA) concentration. Besides, the SV of sludge was reduced and the settling characteristics of sludge were improved. But high dosage of peracetic acid lead to a decrease in biogas production and the proper dosage was 20 g/kg DS. It can be concluded that sludge anaerobic digestion with peracetic acid pretreatment is an effective method for biomass material transformation.

Abstract: Nanosized material tungstate zirconia (WO₃/ZrO₂) was prepared by surfactant -assisted precipitation. Structural characterizations of the catalyst were performed by N₂ adsorption– desorption and FTIR pyridine adsorption spectroscopy. Preparation of peracetic acid (PAA) from acetic acid (AA) and hydrogen peroxide (HP) under the catalysis of Lewis acid WO₃/ZrO₂ was investigated.

Abstract: The drawbacks of traditional chemical degumming for raw ramie are long process line, huge energy consumption, with large environment pollution, and low efficiency. Therefore, an attempt has been made to carry out degumming of ramie with an eco-friendly chemical namely, peracetic acid and sodium percarbonate in this communication. Compared with the traditional chemical degumming process, the oxidation degumming process with the characteristics of environment-friendly production technology is short process, less pollution, low energy consumption and high production efficiency and so on. Meanwhile, the hydrolysis products of peracetic acid and sodium percarbonate do a little harm to the environment. Tenacity, fineness, and breaking elongation of degummed samples were determined by standard methods. The results were confirmed through COD, pH, colority, SEM, tensile properties etc. The performance of peracetic acid degumming and sodium percarbonate degumming were also compared with conventional chemical degummed fiber. In addition, the COD, pH value, colority of degumming solution is greatly reduced using oxidation degumming process, environmental pollution and sewage treatment costs are significantly reduced.