Treatment method of full-age landfill leachate

Abstract

The invention relates to the technical field of landfill leachate treatment, in particular to a treatment method of full-age landfill leachate. A nitrosation-anaerobic ammonia oxidation technology isadopted for denitrification, energy regeneration of organic matter in early-age landfill leachate can be achieved, addition of organic carbon sources in the denitrification process of middle-and-late-age landfill leachate can be reduced, the denitrification efficiency is high, the nitrification liquid reflux ratio can be greatly reduced, and power consumption of the high reflux ratio of a traditional denitrification technology is reduced; a magnetic coagulating sedimentation technology is coupled after nitrogen and carbon removal, so that phosphorus and degradation-resistant macromolecular organic matter in the wastewater are synchronously removed, the medicament demand is low, and the interference of other substances is avoided; and hydrogen sulfide and volatile organic acid gas generatedin the anaerobic methanation treatment process are used as electron donors for subsequent denitrification, so that the dependence of the subsequent deep denitrification process on an external carbonsource is greatly reduced, the membrane-free treatment of the landfill leachate is further realized, and the problem of difficulty in removal of concentrated liquor after treatment by a membrane separation technology is avoided.

Description

technical field [0001] The invention relates to the technical field of landfill leachate treatment, in particular to a treatment method for all-age landfill leachate. Background technique [0002] Landfill leachate is a long-standing by-product after sanitary landfill, and its composition is complex and changes with the continuous changes of waste components, landfill age and season. Early landfill leachate was mainly composed of degradable organic matter and ammonia nitrogen. However, with the extension of landfill time, degradable organic matter gradually degraded during the landfill process, and the concentration of degradable organic matter in landfill leachate gradually decreased. Refractory organic matter The components of the wastewater are gradually increasing, and the content of ammonia nitrogen in the wastewater is also increasing. Compared with complete physical and chemical treatment, biological treatment has a higher cost performance and has become the preferre...

AI Technical Summary

Problems solved by technology

However, with the closure of the landfill and the change of water quality in the later period, especially the mid-late stage landfill leachate with high ammonia and low carbon, the traditional biological denitrification process faces the shortage of degradable organic matter, large aeration volume in the nitrification process, high NH 4 + Toxicity, high reflux ratio of nitrifying liquid and low nitrogen loading level of the overall process lead to a substantial increase in denitrification costs, and sometimes even affect the stable operation of the process

At this time, conventional physical and chemical methods, such as: ammonia stripping, gaseous deamination membrane and reverse osmosis, etc., although the treatment of such high-ammonia wastewater can ensure that the effluent quality is stable and up to standard, it requires higher material consumption and energy consumption, and there is still hardness. and the interference of surfactants on the removal effect, and more importantly, the large amount of dope produced by membrane separation is difficult to go

The current disposal method of recharging to landfill has led to a gradual increase in the salinity of a large amount of landfill leachate. Over time, the salinity in the landfill leachate has gradually increased, and the problem of affecting biological activity has gradually emerged.

On the other hand, due to the change of water quality, the reconstruction of the later process also requires a lot of infrastructure costs

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