The Study of Aluminum Sulfate Purifying Effects for Papermaking Wastewater

As a high concentration organic wastewater, papermaking wastewater is so strong stability that it is difficult to be decomposition by microorganisms [1, 2]. Through adding aluminum sulfate Al2（SO4）3, the stability of the wastewater will be changed and the value of the COD Cr will be lower. The effect of some important operation parameters, such as the dosage of the pharmaceuticals, pH value and stirring intensity were investigated and optimized. After the experimental, the results showed that, when the optimal dosage of Al2（SO4）3 was 1.5g/L, the solution pH controlled in 6~8, it could get the best treatment effect.