Garbage incineration technology tends to mature why the phenomenon of repeated avoidance staged

2018-04-13 21:00:02

The phenomenon of "neighbors" in waste incineration has been the subject of controversy as the public is not aware that the construction of a waste incineration plant has been hampered. At this stage, what exactly waste incineration technology, the public how to treat the issue of waste incineration?

One side is to speed up the construction, while the masses do not understand.

While accelerating the construction of a waste incineration plant across the country, disputes and conflicts have also intensified. Recently, Hunan Ningxiang, Hubei Xiantao and other places, construction of waste incineration plants frequently obstructed by the local public do not understand, and even some cities have built garbage incineration plant is also difficult to normal operation.

What is waste incineration technology? What is the impact on the environment? How to treat garbage incineration scientifically?

Waste incineration technology no problem

Talking about the technology of waste incineration, Central South University School of Metallurgy and Environment Dean Chai Liyuan and other authoritative experts have no strange answer is: waste incineration technology is already very mature, from a theoretical and purely technical point of view, no problem.

Zhang Yi, president of Shanghai Institute of Environmental Science introduced garbage incineration project has many advantages. For example, for the same amount of garbage, the landfill area is only 1 / 20-1 / 15 of the sanitary landfill site; the waste is usually decomposed in the sanitary landfill for 7-30 years, while the conventional garbage is burned for about 2 hours Can be processed; equivalent amount of garbage, landfill about 30% capacity reduction, about 60% reduction of composting, burning about 90% reduction capacity; According to research by the German authority of the Environmental Research Institute, the pollution generated by waste incineration is only health Landfill of about 1/50. "Waste incineration energy" is also more impressive. Each ton of garbage can incinerate more than 300 degrees of power generation and generate household waste of about 5 persons. Power generation by incineration can meet the daily electricity demand of one person.

Since the 1970s, with the continuous development of high-tech flue gas treatment technology and incineration equipment, especially in the early 21st century, the control and management level of VA has risen sharply, and the waste incineration technology has entered into a mature stage. Not only by high temperature oxidation of bacteria in the garbage to eliminate pathogens such as viruses, to minimize waste land resources, but also can effectively use the heat generated by waste incineration. Public information shows that as of June this year, in our country, about 180 municipal solid waste incineration power plants have been put into operation in the cities. The total processing capacity is about 160,000 tons of garbage per day, with a total installed capacity of about 36,000 MW, mainly Distributed in economically developed areas and major cities. Jiangsu, Zhejiang and Guangdong provinces have the largest number of incineration plants.

"Garbage incineration and sanitary landfill are by far the most commonly used mainstream technologies, and what kind of garbage treatment a city chooses should be scientifically decided according to local conditions.Usually, cities with dense population, developed economy and scarce land resources should be given priority Garbage incineration. "Zhang Yi said.

Technology is no problem, where is the problem?

It seems incontrovertible that incineration technology is good for waste disposal. Crowd protests can be wave after wave, where exactly is the problem? The answer of the experts is also surprisingly consistent: the management is flawed or the supervision is ineffective, resulting in the so-called phenomenon of neighbors. For some observers, the main problem facing the incineration plant is the "neighbors" phenomenon. "Whether you have it or not, I do not care if I build it elsewhere. I will oppose it if I build it at my door."

According to He Jianjun, president of Hunan Environmental Protection Volunteer Service Federation, the domestic waste incineration problem may be at the front end - the garbage collection process is not done well enough, resulting in garbage mixing and easy generation of poisonous chemical gases such as VA and so on. "Foreign countries such as Japan and Germany can build parks next to the garbage incineration plants and some even become landmarks in the area, which is related to their well-done sorting of waste."

However, Yang Weichun, an associate professor of the School of Resources and Environment at Central South University, has a different view. "Garbage sorting is a sufficient but not necessary condition for waste incineration, which can indeed serve to reduce waste disposal and pollution emissions, improve combustion conditions and improve power generation efficiency, etc. Incineration technology, in itself, is able to adapt The typical technology to deal with mixed garbage, the current world most of the cities using waste incineration did not do a complete classification of garbage. "Yang Weichun said.

To get rid of the phenomenon of "neighbor avoidance", we must first remove "technical arrogance"

If the "neighbor phenomenon" continues to prevail, it may lead to the plight of garbage out and the entire society disorder. During the interview, experts called for the government or enterprises to fully disclose the possible impact of the project. They should truly understand the concerns and expectations of residents and stakeholders in the surrounding area and respond carefully to avoid "technical arrogance."

"No matter how advanced the waste incineration plant or disturbing facilities, we must recognize this environmental impact.Many domestic and foreign experiences show that whether ecological compensation can be put in place in time is the key to solving the phenomenon of neighbors." Zheng Minghui, a researcher with the Chinese Academy of Sciences Institute of Eco-Environment said.

At the same time, experts have suggested that the most worrisome and misleading scientific questions about the waste incineration need to be fully publicized and explained. For example, VAI is actually an abbreviation of VA, with about 210 organic compounds, of which only a few are toxic. Moreover, VAI is not a peculiar nuisance to a waste incineration plant. It is a chemical compound that organic compounds produce when heated with chlorine, a common chemical phenomenon.

Under the prior art, a waste incineration plant can completely decompose two VA in the incinerator chamber. After passing through the most advanced purification treatment system, the concentration of two units of VA in the unit will be controlled within 0.1 nanograms to meet the most stringent emission standards in the world standard.

At present, these problems have gradually gained the attention of relevant departments. In the first half of this year, Dongguan City Urban Management Bureau took the lead in putting flue gas monitoring information of waste incineration plants in the country. Guangzhou is also working on drafting the "Measures for Regional Ecological Compensation of Domestic Waste Terminal Treatment Facilities in Guangzhou" and tries to use ecological compensation mechanisms to ease this Aspects of the conflict.