Method and device for controlling biological treatment process of early landfill leachate

Abstract

The invention provides a method and a device for controlling a biological treatment process of early landfill leachate, belonging to the technical field of biochemical-process sewage treatment. An ASBR (Anaerobic Sequencing Batch Reactor) is used for accurately judging an anaerobic digestion end point through real-time pH monitoring; original leachate for adjusting COD (Chemical Oxygen Demand) / NH4<+>-N to be 3-4 as inflow water of pulse SBR (Sequencing Batch Reactor) is added in an intermediate water tank; according to the pulse SBR, due to the operation mode of combining three-time equivalent water-feeding with intermittent stirring and aeration, a carbon source in raw water and a carbon source in sludge are fully utilized; during aerobic denitrification, the aeration time is controlled through real-time monitoring of DO (Dissolved Oxygen), pH and ORP (Oxidation Reduction Potential); and during denitrification, the stirring time is controlled through real-time monitoring of pH and ORP. According to the method and the device for controlling the biological treatment process of the early landfill leachate, provided by the invention, the time of aerobic digestion, the stirring time of anoxic denitrification and the aeration time of aerobic denitrification can be accurately controlled; and the method and device have the advantages of reduced energy consumption, shortened reaction time, no addition of external carbon source, high TN (Total Nitrogen) removal rate, reduced sludge and the like.

Description

Technical field [0001] The invention relates to the technical field of biological treatment of sewage by a biochemical method, in particular to a control method and device for the biological treatment process of early landfill leachate. Background technique [0002] In 2009, there were 654 cities in my country with a population of 350 million. The volume of urban waste was 167 million tons, and the average annual growth rate of domestic waste was 3%. The garbage disposal facilities have also changed greatly. In 2009, my country’s total waste disposal volume was 119 million tons, of which 80% was landfilled, 20% burned, and 2% composted. It can be seen that landfill is the main method of urban waste treatment. Landfill is suitable for my country's national conditions and is an effective and low-cost method of urban waste treatment, but landfill will produce a large amount of landfill leachate. Compared with traditional urban domestic sewage, the water quality of landfill leachat...

AI Technical Summary

Problems solved by technology

Some previous studies believed that the high concentration of ammonia nitrogen and heavy metal ions in urban landfill leachate would inhibit the normal metabolism of microorganisms. At the same time, biological denitrification generally requires the addition of a large amount of external carbon sources, which increases operating costs. However, the use of reverse osmosis technology There is also the problem of high processing costs

[0004] The traditional process of treating early landfill leachate has a certain effect of denitrification and removal of degradable organic matter, but the controllability of the operation process is poor, and it is impossible to achieve a TN removal rate of more than 90% without adding carbon sources. The operation of traditional ASBR The cycle tends to be fixed, too long stirring time will cause waste of electricity, and too short stirring time will cause incomplete reaction; the traditional SBR operation mode is also difficult to achieve deep removal of TN

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