Variation In Assimilable Organic Carbon Formation During Drinking Water Treatment Of Microcystis Aeruginosa Solutions

In recent years, the rapid development of China’s economy and industry, a sharp rise in the urban population, a large number of industrial wastewater and domestic sewage is not treated or treated simply discharged into natural water bodies, which indicates that the management of our drainage and sewerage system is imperfect, causing water eutrophication problem is serious, when the presence of blue-green algae outbreaks, the drinking water treatment systems to China and the quality of water will be more severely affected. Is a very big challenge governance algae water.This topic choose one of the more common visible algae - Microcystis aeruginosa were studied during the growth of Microcystis aeruginosa in natural water bodies will release algal toxins and produce odor, resulting in deterioration of water quality. Chlorine as a disinfectant or oxidizing agent is widely used in water treatment processes, in-depth understanding of chlorine oxidation treatment with different concentrations of Microcystis aeruginosa water during assimilable organic carbon (AOC) formed the law, for the evaluation of biological oxidation process for drinking water affect the stability of great significance.By chlorine dosage, reaction time, temperature and flocculation process were studied algae water chlorination process variation of AOC. Algal organic matter (AOM) can be divided into intracellular organic matter (IOM) and the extracellular organic matter (EOM).For aeruginosa EOM study found that with the increase of temperature and reaction time, AOC concentration curves were first increased and then decreased; with the increase of chlorine dosage, AOC concentration first decreased and then increased, reaching its highest level after a slight decline; however, as the coagulant dosing, the AOC concentration is decreasing. Through this experiment concluded that under appropriate conditions, AOC formation can be suppressed, the optimum amount of chlorine lowest AOC concentration was 4 mg/L, the reaction time was 12h, temperature 20 °C, the amount of coagulant 40mg/L.For Microcystis aeruginosa IOM found that with increasing reaction time, AOC concentration curve showing a downward after the first rise, then an upward trend; as the reaction temperature, the first decline after the AOC concentration increased; as of chlorine increase in the amount, AOC concentration increased first and then decreased, reaching the lowest value to rise again, reaching a very high level; with the increase of the amount of coagulant, AOC concentration is decreasing. Therefore, the optimum amount of chlorine lowest AOC concentration was 8 mg/L, reaction time, temperature and volume adding coagulant in water samples containing EOM same outcome.Compare aeruginosa EOM and IOM found that high IOM in the AOC content; less EOM in the AOC content. IOM macromolecules containing a small amount of small organic molecules and more organic matter, EOM on the contrary, contain more small organic molecules and small organic molecules. Changes in the amount of chlorine in the reaction, when the small amount of chlorine, EOM large number of small organic molecules are oxidized to break down, and IOM can not be utilized in a small amount of microbial organic molecules to be oxidized, it is obtained can be utilized organics gradually increased. With the increase of chlorine dosage, EOM macromolecular organic matter is oxidized to start small organic molecules, so that increased output AOC, IOM started small organic molecules are oxidized, so that AOC concentration decreased, and subsequently increased the amount of chlorine, it is difficult to be oxidized macromolecular organic matter is oxidized again. In changing the reaction conditions of the time, the best reaction time EOM and IOM are 12h, and 12h after increasing production of AOC, the IOM AOC concentration increased by a big margin, mainly due to IOM contains more organic macromolecules with the extension of the reaction time, the decomposition of organic molecules are oxidized, while some less readily react with organic chlorine also because of further extending the reaction time and gradual oxidation and decomposition. Temperature of M. aeruginosa EOM and IOM influence graph similar, AOC concentrations are decreased first, then increased to 20 °C when. Within a certain range, the higher the temperature, increasing the effective molecular collisions, chlorine disinfection is also possible, for the better removal AOC, reaches a certain temperature, reducing the number of activated molecules, although the reaction rate increases disinfectant but to take advantage of available chlorine at high temperature will be reduced, and therefore can only be effective decomposition of organic molecules that AOC concentration. After adding coagulant, IOM and EOM in AOC concentrations were reduced to a very low level, indicating coagulation process for the removal of the AOC have a good effect.