Landfill Leachate Treatment

Solution：

Landfill leachate contains high salt and high organic wastewater. There are two main treatment methods, 1: small amount of water into the IVECDEST low-temperature vacuum evaporator and extract more than 95% clear distillate into the biochemical, the remaining trace waste to do the next step. 2: After the large amount of lefiltrate is first evaporated through MVR or multi-effect evaporation, the high concentrated mother liquor produced enters the low temperature vacuum drying and crystallization system of VESALT scraping crystallizer, removes the inorganic salts, heavy metals and COD contained in the waste liquid, and finally gets dry solid crystalline salt, the moisture content of solid crystalline salt is ≤15%. The clear and transparent distillate can be reused as water or treated to discharge standards.

Application：

Kitchen waste

Waste incineration plant

Landfill

Rubbish transfer station

Brief Introduction:

Source of landfill leachate:

It is a kind of high concentration organic wastewater that comes from the water of garbage disposal site or landfill itself, rain and snow water and other water entering the garbage site, removing the saturated water holding capacity of garbage and overlying soil layer, and experiencing the formation of garbage layer and overlying soil layer. There is also water leaking from accumulated waste used for incineration.

Landfill leachate characteristic：

Landfill leachate composition is complicated and various kinds of organic ingredients with as many as 100 or more, including all kinds of refractory organic compounds, such as various aromatic compounds and humus, etc.), inorganic salts, such as root, root carbonate and ammonium sulfate, etc.) and metal ions (e.g., chromium, lead and copper, etc.). 

Landfill leachate concentration of ammonia nitrogen, COD concentration is high, the change range is large; Moreover, with the increase of landfill life, the biochemic ability of landfill leachate gradually decreases, and the proportion of ammonia nitrogen and COD and the proportion of nutrients will be seriously unbalanced, which will cause certain difficulties in the treatment of landfill leachate.

Landfill leachate is complex and its main features are:

1. The concentration of organic matter was high, that is, the concentration of COD and BOD is high.

2. The composition of pollutants is complex and the water quality fluctuates greatly.

3. High ammonia nitrogen concentration.

4. The heavy metal ion concentration and high salt content.

Landfill leachate treatment difficulties:

The water quality characteristics of landfill leachate lead to the difficulty of landfill leachate treatment. At present, most of the commonly used landfill leachate treatment methods use biochemical treatment, land treatment, physical and chemical treatment and other processes or a combination of a variety of processes. 

Due to the complex composition of landfill leachate, high ammonia nitrogen content, early biochemical performance is better, but with the extension of landfill time, Not only the content of ammonia nitrogen increases and the biodegradability decreases, but also contains heavy metal ions, and the color is also deep. The biochemical method cannot meet the emission standards, and the subsequent treatment method, such as low energy consumption evaporation, can achieve the ideal treatment effect.

Landfill leachate inlet data:

The limitations of the current leachate treatment technology:

From the current dump leachate treatment, found that in the past only USES the biochemical treatment process of landfills can not meet the requirements of the national basic leachate discharge standards, the combination of biochemical treatment + reverse osmosis membrane technology, can achieve good treatment effect, but the water rates tend to be small, limited processing scale, and membrane technology because of its wall, Lead to membrane process cannot run. 

repeated washing frequency too frequently will cause the system can not work continuously, and shortened the membrane replacement cycle, processing cost is increased, so it need a new kind of leachate treatment technology, to replace.

In our zero waste production application center, we continuously develop the innovative technology can significantly improve the quality of distilled water. For example, with the aid of European technology IVECDEST cryogenic vacuum evaporation technology, by an ingenious system can meet the quality requirements, to get the clear distilled water. This makes our IVECDEST low-temperature vacuum distillation system has unique characteristics in the global market.

Process Diagram:

There are two main methods of landfill leachate treatment:

1. A small water into IVECDEST cryogenic vacuum evaporator, extract more than 95% pure distilled liquid into the biochemical, do the next step with the remaining trace of waste.

2. After the large amount of lefiltrate is first evaporated through MVR or multi-effect evaporation, the high concentrated mother liquor produced enters the low temperature vacuum drying and crystallization system of VESALT scraping plate, removes the inorganic salts, heavy metals and COD contained in the waste liquid, and finally gets dry solid crystalline salt, the moisture content of solid crystalline salt is ≤15%. The clear and transparent distillate can be reused as water or treated to discharge standards.

Proposal 1: concentration solution

Proposal 2: ZLD crystallization solution