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A landfill leachate and treatment method technology, which is applied in the field of landfill leachate treatment, can solve the problems of removal effect interference, affecting biological activity, and high reflux ratio of nitrification liquid, so as to avoid interference from other substances, reduce dependence on external carbon sources, The effect of reducing setup and power consumption
Active Publication Date: 2021-01-29
SUZHOU UNIV OF SCI & TECH
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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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Embodiment 1
[0088] Treatment of early-age landfill leachate (that is, when the ratio of degradable organic matter to total nitrogen in landfill leachate is ≥6):
[0089] The components of the early landfill leachate: COD 8140~15320mg / L, biochemical oxygen demand (BOD) 7540~14320mg / L, ammonia nitrogen 432~712mg / L, total nitrogen 713~1000mg / L, total phosphorus 15~38mg / L;
[0090] Pass the early landfill leachate into the anaerobic reaction tower for anaerobic methanation treatment to obtain a mixed gas including methane and hydrogen sulfide and the first intermediate product; wherein, the conditions of the anaerobic methanation reaction are temperature 37°C, pH value 7.5, the hydraulic retention time is 18h; the mixed gas is passed into the first gas storage tank for use;
[0091] Pass the first intermediate product into the aerobic reaction tank for nitrosation treatment to obtain the second intermediate product; wherein, the aerobic reaction tank is inoculated with nitrosation activated...
Embodiment 2
[0097] The difference from Example 1 is: the treatment of middle and late age landfill leachate (i.e. when the ratio of degradable organic matter to total nitrogen in the landfill leachate is less than 6):
[0098] The components of the middle and late age landfill leachate: COD 2140-4320mg / L, biochemical oxygen demand (BOD) 1040-2120mg / L, ammonia nitrogen 1400-3120mg / L, total nitrogen 1313-2800mg / L, total phosphorus 18 ~23mg / L;
[0099] The middle and late-age landfill leachate is passed into the anaerobic reaction tower for anaerobic methanation treatment, and a mixed gas including methane and hydrogen sulfide and the first intermediate product are obtained; wherein, the condition of the anaerobic methanation reaction is a temperature of 37°C, The pH value is 7.5, and the hydraulic retention time is 12h; the mixed gas is passed into the first gas storage tank for use;
[0100] Pass the first intermediate product into the aerobic reaction tank for nitrosation treatment to ob...
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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...
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