Study On The Factor Of Solid Waste Stabilization To Bioreactor Landfill

With the city development, the volume of solid waste increaced rapidly year by year, the components are also become more and more complex. municipal solid waste (MSW) is one of the main pollution sources in the modern city, so the solid wastes treatment and disposal increasingly become hot spots and focus of many of the studys.And the Sanitary Landfill, high-temperature composting, incineration of waste are the main treatment approches, various countries and regions choose the ways according to their specific geographical environment, socio-economic conditions, the consumer level, and the physical and chemical nature of the waste, and other factors, however, composting, burning will cause serious environmental pollution, and have stringent requirements for the composition of the refuse, so have much more limitations.Sanitary Landfill is the primary means dealing with municipal solid waste now and its direct consequence is the large number of leachate. Leachate have significant environmental destructive effect and must be processed before discharged into the water body. Because the complicated and ever-changing nature of leachate quality and quantity, at present there is no matural technology, Most landfill propose the targeted treatment programs and technology under different specific situations, and other economic and technical requirements. Leachate and is a complex composition of the high concentration of toxic organic wastewater, CODCr concentration up to 60000-70000mg/L. NH4 + concentrations up to 1000 mg or more. nearly 80 species of organisms, including pathogenic microorganisms and certain carcinogens and tumor-promoting and supporting carcinogen, from the security, economic and technical, and other considerations.The bio-reactor theory is one of the significant and potential landfill solid waste handling and disposal methods. It can not only increase the biological landfill gas (methane) production rate and reduce landfill threats to the environment, reduce operation and maintenance costs and landfill pollution ofthe environment of the life cycle, but also because the reactor achieved mainly through leachate recirculation. So the leachate itself can also achieve reductions and leachate treatment for the follow-up to pretreatment results.Methanogenic stage against the emergence marked the reactor internal stability of solid waste entering the stage of theory, In the present paper on how to speed up the process, so as to shorten the life of landfill pollution, reduce maintenance costs perspective, designed the following experiment on the influencing factors were analyzed :1) Impact of Intermittent mandatory ventilation to solid waste stabilization three simulation columns, A column as a blank comparison column, D, E mandatory ventilation, E-on this basis before the garbage filled with activated sludge blending and packing later.2) Impact of different types alkalinity to MSW Stabilization simulation is divided into four occupation, compared to the A-pillar, F, G and H three experiment in leachate into NaHCO3,NaCO3,NaOH three drugs, study on the Impact of different types alkalinity to MSW Stabilization.3) The source of MSW microbial stabilization three simulation columns, column A is comparison column B, C Add of activated sludge, in column C Na2HPO4 plus into leachate as phosphorus to comparison.After nearly three months of the experiment, mainly through the volatile fatty acids (VFA). Chemical oxygen demand (CODCr), biochemical oxygen demand (BOD5), humic acid, and other indicators of detection, examine conditions on the reactor stability of the process, as compared with the extent of the impact and effectiveness aims to identify the reactor to speed up the process of stabilization of the operating conditions, for municipal solid waste disposal has played theoretical guide.Based on the above experimental study, the results of the analysis, come to the following conclusions :(1) mandatory ventilation conditions, Degradation of solid waste acid production stage significantly shorter reactor stability of speed. Under aerobic conditions of solid waste degradation is more rapid, although intermittent mandatory ventilation fail to meet fully aerobic, Among these, there are(2) economic factors to consider, but the semi-aerobic reactors but also the better the desired effect. Plus activated sludge microorganisms to enhance the volume and the introduction of a highly efficient decomposing bacteria, and also adjusted the reactor internal pH environment, the basis of the intermittent mandatory ventilation, under the dual role the degradation rate of various pollutants is faster.(3) weak alkaline leachate recirculation to reduce litter layer of garbage acid fermentation stage. Inhibit high concentrations of leachate, so that a relatively large CODCr lower. The passage of the experimental verification, alkalinity of pH buffer for accelerating the stability of the reactor is operational, and Simple operating conditions, economically viable, and in this experiment, the carbonate alkalinity to the low pH buffer is the best. But the actual works is also used in pharmaceutical further experimental verification.(4) Append activated sludge which from the sewage treatment plant before solid waste fill in the simulation columns can increase the number of effective microorganisms in the reactor, thereby enhancing the microbial degradation. Single activated Sludge to the right CODCr is little degradation effect, The need for further microbial life activities must adjust nutrition, this experiments include the phosphorus acid alkali salt not only regulate nutrition while adjusting the system of internal alkalinity. reduce acid production in filled early stage of methane-producing bacteria in vitro, but also enhance the bioreactor to a high concentration of salts material degradation.(5) Based on the reaction kinetics fit analysis to the experiment, qualitative analysis goes to quantitative further discussion, educe : intermittent mandatory ventilation with the activated sludge simultaneously and the results of this experiment is the best. Different types of alkalinity to landfill buffer capacity on pH is six to one, in the experiment two OH- release buffer of Na2CO3 alkalinity is the best results.