As the eye can see marginal 1200 mu of the riverbed, one person's much taller reeds, typha blowing in the wind, the nearby toiled workers. With cars, the only wild birds circling, looks like the birds also use here as the "paradise", an artificial wetland ecosystem, the equivalent of a environmental protection low consumption of sewage treatment plants, dirty water purification after tertiary became clear.
Work like rice farming in the south
Filed a sewage treatment plant, people first think of the giant water pump room and a cement pond, with all kinds of machinery at work. But in s river into the mouth of the artificial wetland in instead of 78 pieces of square founder of paddy field, the inside of the reeds and cattails respectively, as a modern farm, actually it is xi 'an government "eight water embellish changan" the focus of environmental engineering projects.
At noon on July 2, 2015 climate some hot, workers Wang Feng and zhan cheng levelled with diesel grass trimmer weeding. Each has ridge road next to the paddy field, weed control in order to make the roads. At ridge road was buried under thick pipes. For water industry Wen Xianjin in each channel mouth to take water samples, through the tertiary purification, sewage from s river became clear, carrying out into the wei river mouth water samples, he said: "swimming."
Workers Chen Shixing said: "the work here is similar to farming, much like southern paddy fields, we have to wear a rubber suit to clear the blockage, weeds, switch channels. Many people mistakenly thought we was a tiller of the ground, ask kind of grass is medicinal materials, how much money a kilo. They think that this is a wastewater treatment project."
Purification pool planting reeds and cattails
Pan Zhongshan is constructed wetland's little head, he tells the story of the working principle of the artificial wetland: first of all in s river into the mouth near a large pool of water, high of the dirty water through the mesh filter and precipitation, by the large pump into the pond. And then to build all kinds of roads and canals, by valve connection between channels, pieces of square founder of paddy field is equivalent to the purification of the sewage treatment plant pool, here two types of plants are planted in reeds and cattails, other weeds must be removed. The roots of the plants developed "eat" sewage harmful material, using the matrix microbe, physical, chemical and biological synergy, through filtration, adsorption, sink, ion exchange, microbial degradation to implement efficient purification of waste water, waste water recycling and harmless, belong to a kind of ecological management method of sewage.
Using the high water head and valve control of the pool, sewage purified themselves. Between paddy field with tracery wall osmosis filtration of perforation and perforated pipe, through workers' control and adjustment to improve efficiency. Contrary to the artificial wetland, the artificial wetland underlying set of seepage prevention facilities, the processed sewage will all into the wei river. Compared with the general sewage treatment plant, artificial wetland, low power consumption, do not use any chemical additives, truly environmental treatment of sewage. Here worked day and night, there are 20 staff, is much less than the general sewage treatment plant.
Ecological sewage treatment make the environment more beautiful
Xian city environmental protection bureau deputy inspector of the alliance, said li s river pollution more serious in recent years, the COD value of 150, the artificial wetland investment 40 million yuan, in August 1, 2013 formally put into use, design, sewage, 70000 cubic meters, the main pollutant removal rate reached 50%, the COD can be dropped below 50, effectively improve s river into nutrient-laden water quality, lower weihe river pollutant load, cut down the emissions of organic compounds and ammonia nitrogen. The project is also xi 'an to the government's "eight water embellish changan" environmental protection engineering.
With constructed wetland to sewage treatment, the next in the wei river next to the city sports park environment become more beautiful, here the grass green, as many people a good place for leisure. Xianyang lee every day along the wei river bridge and the new grass land eight-channel nutrient-laden highway to the sports park in the ride a bike, he said: "the biggest change in almost three years here, before the sewage pungent odor, garbage silting channel is gone now, replaced by the advanced nutrient-laden road and continuously along the riverside park in the landscape, and motor vehicle rarely, riding a bicycle to exercise a breath of fresh air is really an enjoyment. I hope the government can take a few more such ecological sewage treatment project, not only beautify the environment and deal with the sewage."
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