3 污染防治问题 Second Pollution Issues

蒸发渗漏液有两个引人关心的问题:一是蒸发后的气味问题;二是蒸发后,渗漏液中所含的有害物质微粒的沉降问题。

1、气味问题:为了防止气味问题,我们建议与NWC 的专利生物和植物气味控制剂结合,用配比泵使之与输液管中的渗漏液混合喷出。然而,实地使用蒸发渗漏液的气味问题比想象的要小得多,原因之一是因为极其微小的雾粒提供了极大化的与空气接触的表面积,就象一个高效的曝氧装置,使渗漏液中的气味分子最大限度地与空气中的氧气接触被氧化,加上气味控制产品的作用,基本上解决了气味问题的产生;原因之二是与氧充分接触的固体微粒和少数雾粒回落到池中后,会大大增加池中的含氧量,加速有氧生化过程对气味和污染物的氧化降解或固化;原因三是因为渗漏及时被蒸发消耗,极大缩短了渗漏液的无氧呼吸和发酵过程,没给产气菌产生臭味的时间。

Odor issue: To prevent odor problem, our patent botanical and biological odor control products can be combined with the system application. However, just the use of the system minimizes odor issues. One of the reasons:The tiny mist droplets provide an extremely high surface area for the particles to contact with oxygen.This process provides for highly efficient aeration and oxidization of the organic compounds that create odor. With the action of odor control products together, it makes the odor issue no longer a problem in the application.Further the tiny solid and minor mist particles which come in contact with oxygen in the air and which fall back into the pond, because of their higher oxygen content will provide accelerated aerobic biological activity which biodegrades and immobilizes other pollutants.Finally, the retention time of leachate in ponds is reduced greatly due to evaporation minimizing the time odor producing bacteria have to generate odors.

2、蒸发后微粒的沉降问题:为了防止蒸发后的有可能含有有害物质的固体微粒漂离垃圾场而污染围边环境,我们建议在渗漏液收集池的三向设置一个6-8米的屏障,开放的一向为上风向或背向垃圾工作面。然而,实地使用蒸发渗漏液而产生的固体微粒的沉降问题,不像想象的那样而成为此技术使用的一个障碍,因为,“台风”旋转蒸发雾头专门设计95%以上蒸发雾粒直径为100微米左右。这个尺寸的优势是雾粒在兼顾蒸发效果的同时,能最大程度控制雾粒漂移的距离。例如,当风速为5KM/H和32KM/H时,雾粒分别只能漂移15米 和100米远;而传统的高压喷嘴产生的雾粒尺寸非常分散,大部分布在 20-100微米。20-50微米尺寸的雾粒,在5KM/H风速时,它的漂移距离在50至数百米远。所以,风再大点时,漂移的距离会很远,不利于气味和尘粒的控制,这也是大部分人担心此技术会产生二次污染的原因。加上,蒸发设备一般放置于渗漏液池的上风向,且高度接近池面1-2米左右。所以,绝大部分固体微粒会降落于渗漏液池;如配合使用屏障,固体微粒极少能跑出渗漏液池的范围,不会对围边环境产生影响。

Precipitation issue: To prevent tiny solid particles that might be hazardous from being blown away from the origin to contaminate the surrounding environment, we suggested customers setup a 6-8 meter fence on three sides of the leachate pond.The side which remains open should be the side from which prevailing winds blow. Please note that the onsite demonstration shows the issue of small droplets of leachate floating out of the pond perimenter did not become a problem because the designed size of 100 micron droplets will not float more than 15 and 100 meter when wind speed are 5km/h or 32km/h, respectively. Conventional high pressure nozzle system generate the mist size in a broad scope between 20-100 micron droplets. Whereas, the 20-50 micron droplets will float 50 to several hundred meters with the wind speed of 5km/h. In addition, the 1-2 meter height of the heads and location of machines where used to be the upwind direction of the ponds, as well as the fence will make the mist particles fell back into the ponds and stopped by the fence. So, it would not be an environmental problem.

请看一下这样一组科学的数据表明了雾粒尺寸与沉降时间和漂移距离的关系 Please take a look the scientific data to show the relationship between mist particle size and time to fall and drift

雾粒尺寸(μm) Particle Size
感观尺寸
Comparative size
沉降10英尺的时间 (秒)
Time to fall 10 ft (seconds)
风速5km/h漂移的距离(米)
Drift in 3 mph wind (m)
每加仑废水的雾粒数
Droplets in one gallon
10
湿气雾 Wet fog
1,020
1,372
7.23百万亿
40
湿气雾 Wet fog
64
85
1130亿
50
雾雨 Misty rain
40
53
578亿
100
雾雨 Misty rain
11
15
72.3亿
200
小雨 Light rain
4.2
6
9.03亿
400
小雨 Light rain
1.9
2.5
1.13亿
500
中雨 Moderate rain
0.9
2.1
5650万
1000
中雨 Moderate rain
0.85
1.5
630万

此技术已在田纳西州“废物管理集团公司”下属的十几个垃圾场运行, 并通过了美国环保署认可,来继续用该方法处理其垃圾渗漏液。“废物管理集团公司”是北美综合环境问题解决方案的领头羊,拥用几百个垃圾场。

This technology has been successfully applied in more than ten landfills of Waste Management, Inc. in Tennessee and has also gotten permission from EPA to use the technology to evaporate leachate. Waste Management, Inc. is North America's leading provider of integrated environmental solutions. They possess hundreds landfills.