Method for treatment of landfill leachate by strengthening biochemical reaction with microbial agent

Abstract

The invention discloses a method for treatment of landfill leachate by strengthening biochemical reaction with a microbial agent. The method comprises the following steps: introducing pretreated landfill leachate into an anoxic tank to perform denitrification, and adding an activated and naturalized composite denitrifying bacteria solution into the anoxic tank; introducing the landfill leachate which is treated by the anoxic tank into a biological contact oxidization tank to perform nitration and remove COD, and adding activated and naturalized aerobic bacterial solution and composite denitrifying bacteria solution into the biological contact oxidization tank; and introducing the landfill leachate which is treated by the biological contact oxidization tank into a follow-up process. The strengthened biological method provided by the invention can improve biodegradability of the landfill leachate, improves biological reaction treatment effect and treatment efficiency of the landfill leachate, so that a more proper water quality condition is created for follow-up leachate through a membrane system.

Description

technical field [0001] The invention relates to the field of landfill leachate treatment, in particular to a method for treating landfill leachate by using microbial agents to strengthen biochemical reactions. Background technique [0002] Garbage is a kind of difficult-to-treat high-concentration organic wastewater. The leachate has complex components, high COD, heavy metals, ammonia nitrogen, and salt content, and the biodegradability of the leachate is poor, with a large proportion of macromolecular organic substances, including some difficult-to-biodegrade aromatic compounds, esters, and anilines Substance etc. [0003] Landfill leachate generally adopts a combined process of "pretreatment + biochemical treatment + membrane treatment + advanced treatment". Among them, biochemical treatment uses the biochemical action in microorganisms to decompose organic matter and some inorganic poisons in leachate and reduce the total nitrogen content in leachate, which is an import...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned biochemical treatment process, there will be the following problems: 1) The biochemical system has poor ability to adapt to water quality changes. As the water quality of landfill leachate increases with the landfill time, BOD5 / COD shows a downward trend, and the biochemical property decreases. 0.4-0.8 in the early stage of landfilling will drop to 0.1-0.2 in the late stage, and the biochemical reaction will show that the system works well in the early stage, but the system does not adapt to it in the later stage

2) Organic matter is difficult to biochemically degrade, the main reason is that the external environmental conditions during treatment do not reach the optimal conditions for biological treatment; the chemical composition and structure of the compound itself, in the microbial community, there is no enzyme for the compound to be processed, making it It is resistant to degradation; the wastewater contains substances that are toxic to microorganisms or can inhibit the growth of microorganisms, so that organic matter cannot be degraded quickly. Therefore, the COD and ammonia nitrogen in the biochemical effluent are too high, which is not conducive to the operation of subsequent nanofiltration, reverse osmosis or advanced oxidation reactions

The patent uses high-efficiency nitrifying bacteria, which can only improve the nitrification effect and nitrification treatment rate, but cannot handle refractory organic matter well. Moreover, this method is to directly add the bacteria agent to the BM nitrification tank (corresponding to the aerobic tank) In the filler, the bacterial agent hangs a film in the filler, and the amount of bacteria used is relatively large

Images