Study On Anaerobic Processes Treating Flax Wastewater

Insufficient water source and contaimintated water has become one of the most serious global problems, with the development of society. People, now, pay more attention to purifying wastewater. Thus the treatment of industrial wastewater has been one of the major research topics in the world. The anaerobic treatment has been deployed to treat organic wastewater in industry for over a hundred years. With the development of anaerobic digestion technology, the use of anaerobic purified set has become the major method of organic wastewater treatment over the world. It has become one of the key tasks in contemporary industry to research on wastewater treatment techniques with high efficiency, low investment, few power-wasting, little space demand and low running expenses, and the research shall consider industry's reality and characteristics of the wastewater.This paper gives a comprehensive and systematic study on flax retting wastewater treatment with anaerobic digestion, and it covers the following items: (1)Potential of the biogas fermentation with flax retting wastewater. (2) Defined the suitable conditions of treating flax retting wastewater in laboratory, and domesticating high efficiency microbe. (3)The experiment on the feasibility of treating flax retting wastewater in laboratory, and explored the theory of the decomposed pathways of flax retting wastewater. (4)The devising and making of aerobic reactor and optimizing of techniques parameters according to experimental results. (5)Operating aerobic reactor, to make effluent reaches The Second Level of Integrated Wastewater Discharge Standard(GB8978-1996). The results of experiments are as follows: (1)On the normal temperature, the potential of the biogas fermentation is 3.97m³ per stere wastewater. It can get biogas 0.409 m³per lkgCOD decomposed. (2)Got much high efficiency microbe which had been domesticated. (3)Adopted new-type anaerobic filter, which HRT is 5 days and aerobic baffled process, which HRT is 4.5 days. The indexes of effluent wastewater could reach The Second Level of Integrated Wastewater Discharge Standard. They were COD, NH₄⁺-N, P, pH, SS and chroma, which independently is 104.73mg/L (decomposed rate is 99.03%), 21.42mg/L (decomposed rate is 84.48%), 0.53mg/L (decomposed rate is 63.80%), 8.37, 80.00 mg/L (decomposed rate is 85.45%) and 50 (decomposed rate is 90.91%).