Regulation Of Excess Sludge Carbon And Nitrogen Biom Resource Recovery Process System

The disposal and recycling of excess sludge is a major concern of current environmental development.Microorganisms use their own activities to degrade organic pollutants in sewage,which constitutes sludge flocs.The sludge floc contains abundant organic carbon sources such as proteins,sugars,lipids and the like.After the sludge floc is completely cracked,the protein content accounts for more than 55% of the total organic carbon source of the sludge lysate,which has great resource recovery value.Macromolecular protein is one of the factors that cause the slow rate of hydrolysis in subsequent biological treatment processes.As a crude protein product,it can not only realize the productization of organic carbon source,but also reduce the load of subsequent biological treatment.In addition,the electrolytically enhanced anaerobic biocapacity technology can enhance the extracellular electron transport of microbes by applying voltage,increase the rate of methanogenesis,and achieve efficient energy recovery of residual organic carbon sources.After the above continuous process treatment,most of the organic carbon source in the sludge lysate can be separated,degraded and transformed,and the effluent is relatively clean,and can be used as a substrate for algae growth.Comparative analysis of acid pretreatment method,alkali pretreatment method,high temperature thermal hydrolysis method,enzymatic method and ultrasonic method for sludge floc cracking research,explore the research mechanism of each pretreatment technology,and clarify the research results.The remaining sludge proteins were separated by isoelectric precipitation and membrane separation techniques to determine the separation effect and combine the advantages of the two to optimize the protein separation method.The high-temperature thermal hydrolysis pretreatment method used in this study can achieve complete sludge cracking,and more than 90% of the microorganisms die.The obtained lysate has rich nutrient content,which can not only recover energy but also generate a large amount of sludge residue.More complete sludge treatment anddisposal.The sludge was pretreated by high temperature thermal hydrolysis under different conditions,and the release effect of carbon source was improved to different extents.The effect of sludge solid content on TS reduction,VS reduction,NH4+-N,TVFA and soluble sugar concentration Significantly,while TOC and soluble proteins are greatly affected by temperature.The concentration of organic matter dissolved in high temperature thermal hydrolysis increases first and then decreases with the increase of temperature.150 °C,30 min is the best heat treatment condition.When the temperature is too high,the Maillard reaction will occur,and the concentration of soluble sugar and soluble protein will be increased.decline.The protein in the residual sludge lysate was extracted by isoelectric precipitation method.The optimum conditions for extracting excess sludge protein were studied by single factor and orthogonal experiments.The high performance liquid chromatography and inductively coupled plasma optical emission spectrometer were used to analyze the optimal process conditions.The amino acid and heavy metal composition of the obtained protein are separated by membrane separation method,and the residual sludge organic carbon source obtained after separation has a small molecular weight and is more easily utilized by the organism for energy conversion and protein content.The reduction also helps to reduce the risk of inhibition of ammonia nitrogen concentration.It provides a useful reference for the extraction and resource utilization of residual sludge protein.