Preprocessing method for percolate of domestic garbage landfill

A technology for landfill and domestic waste, which is applied in the field of pretreatment of leachate of domestic waste landfill, can solve the problems of large amount of chemical sludge, large amount of dosing, high energy consumption and cost, and achieves a simple process. , easy operation, low cost effect

Inactive Publication Date: 2008-11-19
白德贵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of dosing, this flocculation and sedimentation process has the disadvantages of producing a large amount of chemical sludge with high salt content, low pH value of the effluent, high salt content, and low removal rate of ammonia nitrogen. Therefore, in practice In application, it doesn't make much sense
There are also people who use sacrificial anodes such as iron and aluminum to do electro (decomposition) flocculation and sedimentation treatment ["Water Treatment Technology", 2006, volume 32 first phase, page 48] to landfill leachate with sacrificial anodes such as iron and aluminum. Although there is a certain effect, it can The consumption and cost are too high, and the salt content of the effluent and chemical sludge is high, and there is not much practical significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Using the leachate from Chongqing Changshengqiao landfill as raw material, its appearance is black, completely opaque, and a foul-smelling liquid with a COD of 15854mg / L, NH 3 -N is 2206mg / L, and the pH value is 7-8.

[0014] Add 25 grams of CaO to 1 liter of the above raw material leachate under stirring, blow in about 8,000 liters of air, let it flocculate and settle, and after settling, the upper clear solution is light yellow, basically transparent liquid, odorless, and its COD is 9419mg / L, NH 3 -N is 130mg / L, the suspended solids (SS) is close to zero, the suspended solids (SS) index of the leachate after pretreatment reaches the first-level discharge standard stipulated in the national standard GB8978-1996, and the removal rates of COD and ammonia nitrogen are respectively 41% and 94%; The ammonia nitrogen blown out by air is absorbed by the sulfuric acid solution of 70% by weight again, and the absorption rate is 95%, and about 9.3 grams of by-product ammonium ...

Embodiment 2

[0016] The leachate from Chongqing Changshengqiao landfill is used as raw material, and its appearance is black, completely opaque, and foul-smelling liquid, its COD is 16800mg / L, NH 3 -N is 2490mg / L, pH is 7-8.

[0017] Add 60ml of Ca(OH) saturated at room temperature to 1 liter of the above raw material leachate under stirring. 2 Solution, blow about 7500 liters of air, let it flocculate and settle, after settling, the volume of the sediment in the lower layer is about 7% of the total volume, and the clear solution in the upper layer is yellow, basically transparent liquid, slightly smelly, and its COD is 10080mg / L, NH 3 -N is 155mg / L, the suspended solids (SS) is close to 0, the suspended solids (SS) index of the leachate after pretreatment reaches the first-level discharge standard stipulated in the national standard GB8978-1996, and the removal rates of COD and ammonia nitrogen are respectively 40% and 94%; The ammonia nitrogen blown out by air is absorbed by the sulfu...

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Abstract

The invention belongs to wastewater treatment and relates to a method for pretreating percolate in a landfill waste site. The method selects CaO, Ca(OH)2 or Ca(OH)2 water solution as flocculent sedimentation agent, uses air to blow out ammonia nitrogen in the flocculent sedimentation agent, and then uses sulfuric acid solution to absorb the blown ammonia nitrogen so as to obtain a byproduct-ammonium sulphate. The method not only can perform flocculent deposit but also can separate out ammonia nitrogen and COD, is simple and easy, has low out-of-pocket cost, can obviously reduce the chemical sludge content and the salt content in chemical sludge, and can change separated ammonia nitrogen into resource. The percolate after pretreatment can create a very favorable condition and lay a foundation for further purification treatment and final emission compliance.

Description

1. Technical field [0001] The invention belongs to waste water treatment, in particular to a pretreatment method for leachate of domestic garbage landfill. 2. Background technology [0002] The composition of the leachate of domestic garbage landfill is very complex, and it contains many toxic and harmful substances. According to reports, there are more than 20 kinds of pollutants listed in the blacklist of priority pollutants by my country's environmental protection department and the US Environmental Protection Agency (EPA). . These substances pose hazards to animals, plants and the human body. In a certain place in my country, there has been an incident in which leachate from a landfill poisoned crops. [0003] Landfill leachate can be divided into early leachate and late leachate. Early leachate is landfill leachate with a landfill age of 3 to 5 years, in which the content of volatile fatty acids that are easily biodegradable is relatively high, generally accounting for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/20C01C1/24
Inventor 余华强白德贵尹成渝
Owner 白德贵
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