PV: around “green” and “pollution” of the edge

Polaris solar PV net news: in recent years, frustrated China’s PV industry, industrial situation anticlimax, PV industry began to talk as much, which is one of the most bizarre, some say that PV is not a green industry, but energy-hungry high-emission industries. In we usually people seems, solar is currently can meet human energy needs of best green energy is one of, so using solar production clean energy how on not green industry has does? this problem this not due controversy, but problem actually and no so simple, now both at home and abroad for PV industry whether is green is public said public rational, Po said Po rational, this had to caused we of rational thinking: PV what is green environmental industry?

Pollution, photovoltaic industry?

It is said that current solar energy photovoltaic industry cannot be defined by green, whose pollution can not be generated by the rapid development of our various “modes” are ignored. In fact, there is no smoke, pollution side behind the photovoltaic industry.

First of all, upstream of the photovoltaic industry polysilicon production process does have flaws. Although we have a wide variety of technology for the production of photovoltaic cells, but the mainstream of photovoltaic cells is multi. Current purified polysilicon production is an important part of Silicon metal into three hydrogen Silicon chlorine, hydrogen plus a restoration, about one-fourth of trichlorosilane into polycrystalline silicon, this process will produce a lot of exhaust, and Silicon tetrachloride and TCS, DCS and other by-products formed. These Deputy product among, four chloride Silicon belongs to dangerous material, its physico-chemical nature is easy deliquescence of, and colorless or light yellow sent smoke liquid, belongs to acid corrosion products, will on Shang respiratory, and eyes caused strongly of stimulus, human contact Hou can caused skin organization necrosis; another a containing DCS of TCS Deputy product, which DCS physico-chemical characteristics and four chloride Silicon close, toxicity slightly weak, but once met water or air in the of water will quickly hydrolysis into hydrogen chloride or hydrochloride, and met heat and fire has burning and explosion of May. If the recovery process in the production of immature, these harmful substances containing chlorine are likely to spill, there are serious problems of safety and contamination. Therefore, polysilicon production process produces large quantities of hazardous substances, recycling of these substances become more difficult.

In recent years, the polysilicon production capacity expansion, basically, there are more than 20,000 tons of capacity, with more than 100,000 tons of Silicon tetrachloride. Chloride in purification of domestic polysilicon production process, by downstream vendors to be absorbed. This amount of fluorine-containing substances, has far exceeded the country’s processing power, inevitably there are many fluorine-containing harmful substances has not been properly handled, pollution risks inevitably exist. In addition, the recycling technology is not yet mature, even if technically recyclable, the domestic market is unable to absorb and digest such a rapidly growing Silicon tetrachloride, and existing technologies

Does not completely address the recycling of by-products. Waste water, waste gas, and waste residue of the polysilicon production waste, such as lack of effective treatment and use, polluting the air, water, land and other resources.

Secondly, the PV production process cause pollution to the environment is not confined to the upstream, waste pollution in construction of photovoltaic power generation system is enormous. PV power station during construction of concrete foundations of ecological environmental pollution was caused mainly destruction of vegetation and soil erosion. Basis for concrete structure of big dig fill required forms, such as an independent basis or strip foundations, excavation embankment is bound to cause serious damage to vegetation and soil erosion, to ecologically fragile areas, the consequences will be deadly. Caused by the earth moving during construction dust is the main source of atmospheric environment, bored pile foundation construction process, arbitrarily piled up mud and waste water produced, formed after dry dust can also cause air pollution. Furthermore, currently, China used away from network type PV power system, by solar square, and controller, and DC/Exchange inverse variable device, and battery group, and circuit protection and the with electrical composition, this which also has must not green of factors, lead acid battery is current PV power system battery of mainstay, the battery within contains large of lead, and antimony, and CD, and sulfuric acid, toxic material, will pollution groundwater, and soil, and Prairie,. Energy-saving lamps is an important electrical equipment in remote areas, using rare earth Tri-phosphor fluorescent powder and liquid mercury lamp once broken will have extremely serious environmental pollution. But short-lived batteries and lamp replacement frequency is high, if not handled properly, it will cause pollution to the local environment.

Finally, the light pollution problem seriously. Light pollution on a person’s retina and Iris caused varying degrees of damage, bring about eye drop, even as much as 45% the incidence of cataracts, will also make a person dizzy upset, insomnia, nervous breakdown. PV at present widely throughout the country, some photovoltaic system installed in villas and luxury residential areas and the city’s iconic buildings, photovoltaic lighting has been used in residential areas, scenic lighting and landscape lighting and urban transport projects. Glass surface of photovoltaic cells and solar water heater collector reflection glare in the Sun, light pollution, and these consequences for lives in the lives of people around. In addition, the people’s awareness of environmental protection also needs to be strengthened, current photovoltaic power generation waste management lack of initiative. Especially family building photovoltaic power plants, waste thrown serious. Results of sampling in Qinghai province, the vast majority of home users prior to the survey, with almost no thought to how PV waste pollution and waste disposal problems. When the investigators caution, only 62% users should pay attention to the pollution, 74% throw users 6% users together with the domestic waste piling up, selling a 20% user. According to media reports there are many PV companies arbitrarily dumped industrial byproducts of Silicon tetrachloride, seriously polluted the local villages, farmland, rivers and air.

Second, how photovoltaic industry pollution

PV industry as a strategic industry in China, international leader in recent years. At present, China’s PV market picks up, prices rebounded and favorable policies to stimulate the enthusiasm of photovoltaic companies, also caused by United States and other countries under the Washington Post an article titled solar energy company reports of toxic materials left China caused an uproar in the industry. Western media questioning China PV enterprises environmental protection in favour of chasing profits. The report said that “recycling investment requires a lot of money and time costs, not to mention the more than 1800 degrees Fahrenheit temperature recovery takes a lot of energy,” and “not installing pollution treatment technology, Chinese companies can save millions of dollars in costs … …”

It should be noted is that West’s “high consumption” and “polluting” attacks, there are of course attempts and their sinister motives. However, everything has changed. For instance, Silicon hydride links chlorine in hydrogen technology, is the improved application of chlorine and hydrogen technologies, again reducing the energy and raw material consumption and waste through hydrogenation, turning it into Silicon chloride again over the polysilicon raw material, properly handle the byproducts, while achieving resource recycling, improving efficiency. Industry changes with each passing day, they look at it also times. “Once a detour” polysilicon manufacturing has reinvented itself, technology development of photovoltaic industry has changed, and experience these changes, found on this latest recognition of the industry. In addition, some people are just a little fur, we need to use dialectical thinking, comprehensive and objective view of the pollution problem.

Now, people talk more often chain a link problem. If you look at it this way, it is possible to generalize, exaggerating the PV industry pollution. Conversely, if we look from the perspective of the entire value chain, from a global perspective of the PV market, it will draw a different conclusion. In addition, we also develop eye problems. Now are some of the problems in the development of photovoltaic industry issues will be addressed in future development. If you look only at the moment, there are some big problems seems no solution. But if you look through development and some problems now may be to their advantage. Looking to the future, we can see the PV industry’s trend.

Of course, we must be honest with photovoltaic pollution problems, speed up technological innovation, increasing the investment in environmental protection to promote achieving closed-loop operation of the production process; enhance green consciousness, overcome the problem of waste discarded grave, protection of the ecological environment to realize sustainable development of energy and environment, increase solar photovoltaic industry development zones and industrial parks environmental supervision. For failure to implement the environmental impact assessment, pollution control facilities does not function properly, excess emissions of pollutants, not compliance with effluent discharge permits and caused serious environmental pollution accident, be the focus. Are not up to environmental requirements, to rectification. Has no environmental capacity and total amount control of pollutant emission indicators areas, no more new polluting projects. Strict restrictions on resource and energy consumption, poor economic performance of solar photovoltaic projects, heavy pollution, and control of environmental pollution and ecological destruction from the beginning. Real building photovoltaic industry into green industries to achieve healthy and sustainable development of the whole industry.

Original title: photovoltaic, hovering around “green” and “pollution” of the edge

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