久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

US EUROPE AFRICA ASIA 中文
China / Society

Waste not, want not

By Yang Wanli (China Daily) Updated: 2016-01-06 08:20
Waste not, want not

Experts around the world are working hard to provide solutions to environment pollution, especially the increasing damage that human activities are causing in water systems, said Zhang Jian, president of EnviroSystems Engineering and Technology Co, a company in Beijing focused on vacuum-drainage technology, and sewage and waste.

Zhang said human waste contributes more than 90 percent of the nitrogen and phosphorus released into the world's lakes, rivers and oceans. Scientists are now tackling the two elements as the main focus of their work.

Too much nitrogen and phosphorus in the water causes algae to grow faster than ecosystems can handle, damaging the water quality, food resources and habitats, and depleting the oxygen that aquatic life needs to survive. Some algae blooms also produce elevated levels of toxins and bacterial growth that can cause a range of illnesses, some serious, in humans.

"Nitrogen and phosphorus are like two drops of ink. Other human wastewater, such as that used for washing clothes or bathing, are much less harmful and can be described as 'clean' water," Zhang said. "But if we expel the 'two inks' through the underground drainage system into the large pool of 'clean water', it's extremely difficult to remove those two drops."

In 1985, Zhang moved to Germany, where he spent 10 years researching how developed countries treat the burden human waste imposes on the environment. "I finally realized that the situation in China is absolutely different," he said.

Western Europe and North America have had mature underground drainage systems for centuries, and many countries in those regions are facing negative population growth, thus relieving the burden on their sanitary systems. "To achieve source separation (preventing liquid and solid waste from mixing in the sewage system) would cost too much money and effort. So those areas focus on garbage recycling rather than the toilet revolution," Zhang said.

In 2003, he started work on an eco-toilet that could achieve source separation. His design is as similar to Fan's, but is supported by a solar-powered vacuum assist.

Fan's next plan is to install a type of vacuum trash can in the houses in Chentang and link them to the existing system. The design will mainly be used to collect kitchen waste, which can be mixed with human waste to ferment and be used as fertilizer.

"If kitchen waste is removed from domestic solid waste, the cost of waste treatment in the rural areas would be cut by about 80 percent," he said. "The biggest challenge we face is not related to technology, but whether the government values the potential benefits and supports and promotes the idea."

 

Previous Page 1 2 3 4 Next Page

Highlights
Hot Topics
...
久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

    精品国产一区二区三区不卡 | 国内精品国产成人| 欧美精品一区二区久久久| 国产精品白丝jk黑袜喷水| 国产色婷婷亚洲99精品小说| 粗大黑人巨茎大战欧美成人| 亚洲人快播电影网| 国产精品你懂的在线| av电影天堂一区二区在线观看| 亚洲精品日韩一| 91麻豆精品久久久久蜜臀| 精品午夜一区二区三区在线观看| 国产情人综合久久777777| 91视视频在线观看入口直接观看www| 亚洲已满18点击进入久久| 日韩欧美视频一区| 国产69精品一区二区亚洲孕妇| 自拍偷拍国产精品| 3d动漫精品啪啪1区2区免费| 国产呦精品一区二区三区网站| 国产精品久久久久影院色老大| 欧美在线观看视频在线| 精品午夜一区二区三区在线观看| 亚洲欧洲精品天堂一级| 欧美一区二区三区视频免费播放 | 欧美一区二区三区性视频| 国产福利不卡视频| 亚洲一区二区三区四区在线观看 | 久久久久国产精品麻豆| 色av综合在线| 极品尤物av久久免费看| 亚洲视频电影在线| 欧美不卡一区二区三区| 91网站在线播放| 亚洲永久精品国产| 久久久精品tv| 欧美日韩高清一区二区| 高清国产一区二区| 日本中文在线一区| 成人欧美一区二区三区| 日韩欧美一级二级三级| 91老师国产黑色丝袜在线| 久久99精品视频| 亚洲国产乱码最新视频| 国产欧美日本一区二区三区| 欧美群妇大交群中文字幕| 成人国产精品免费| 美国三级日本三级久久99| 亚洲男人都懂的| 国产亚洲人成网站| 91麻豆精品国产91久久久使用方法 | 制服丝袜激情欧洲亚洲| av网站免费线看精品| 美女免费视频一区| 亚洲综合成人在线| 国产精品天美传媒| 欧美xfplay| 欧美日韩一区在线观看| www.亚洲人| 国产一区二区三区| 日本伊人午夜精品| 一区二区三区四区亚洲| 国产精品水嫩水嫩| 精品乱码亚洲一区二区不卡| 欧美性三三影院| 99re66热这里只有精品3直播| 国产真实乱偷精品视频免| 日韩一区欧美二区| 亚洲在线一区二区三区| 中文字幕中文乱码欧美一区二区| 久久综合精品国产一区二区三区| 911精品国产一区二区在线| 91成人免费电影| www.亚洲激情.com| 成人听书哪个软件好| 国产精品18久久久| 精品一区二区综合| 蜜臀av国产精品久久久久| 91免费看片在线观看| 国产一区二区导航在线播放| 久久成人久久鬼色| 日韩av中文在线观看| 亚洲超碰97人人做人人爱| 亚洲精品免费播放| 亚洲视频免费看| 亚洲人妖av一区二区| 国产精品久久久久久久午夜片 | 国产综合色产在线精品| 美女视频网站久久| 美国欧美日韩国产在线播放| 日本成人中文字幕| 日本不卡一区二区| 日韩国产一区二| 日韩中文字幕亚洲一区二区va在线| 亚洲欧美国产高清| 亚洲男人都懂的| 尤物视频一区二区| 亚洲影院理伦片| 香蕉加勒比综合久久| 亚洲福利一二三区| 丝袜美腿亚洲综合| 日韩精品高清不卡| 免费在线观看精品| 久国产精品韩国三级视频| 另类专区欧美蜜桃臀第一页| 久久av中文字幕片| 国产精品自拍三区| 国产成人精品免费看| 粉嫩绯色av一区二区在线观看| 丁香天五香天堂综合| 不卡的电视剧免费网站有什么| 成人av在线资源| 91在线一区二区三区| 91浏览器打开| 欧美日韩视频在线一区二区| 欧美精品在线一区二区三区| 欧美一级日韩免费不卡| 精品成人免费观看| 日本一区二区免费在线 | 美腿丝袜在线亚洲一区| 久88久久88久久久| 国产成人午夜99999| 不卡一区二区三区四区| 色婷婷av一区二区三区大白胸| 欧美在线观看一二区| 欧美一区二区在线不卡| 久久综合九色欧美综合狠狠| 国产精品美日韩| 亚洲自拍偷拍麻豆| 免费成人在线观看| 国产成人欧美日韩在线电影| av影院午夜一区| 精品视频在线免费| 日韩一级视频免费观看在线| 久久精品亚洲国产奇米99| 中文字幕日本不卡| 五月婷婷综合激情| 激情六月婷婷久久| 不卡的av在线播放| 欧美精品在线一区二区| 久久久国产精品午夜一区ai换脸| 亚洲视频免费看| 日本不卡中文字幕| 粉嫩一区二区三区性色av| 欧洲一区在线观看| 欧美videos中文字幕| 国产精品二区一区二区aⅴ污介绍| 一区二区高清免费观看影视大全| 人人精品人人爱| 成人美女视频在线看| 欧美日韩国产精选| 国产亚洲一区二区三区| 亚洲国产日韩在线一区模特| 国精产品一区一区三区mba视频| 91丝袜国产在线播放| 91精品国产一区二区三区| 国产清纯白嫩初高生在线观看91| 一区二区三区国产| 国产一区二区三区免费播放| 在线观看av一区二区| 欧美精品一区在线观看| 洋洋成人永久网站入口| 狠狠色综合日日| 欧洲人成人精品| 久久人人超碰精品| 亚洲资源中文字幕| 国产精品白丝av| 欧美久久久久久久久中文字幕| 欧美国产日韩亚洲一区| 三级不卡在线观看| 成人av网站在线观看免费| 欧美一区二区三区精品| 亚洲特黄一级片| 国产最新精品精品你懂的| 欧美三级韩国三级日本三斤| 欧美激情在线一区二区| 欧洲人成人精品| 久久奇米777| 天堂久久一区二区三区| www.爱久久.com| 欧美精品一区二区精品网| 亚洲在线观看免费视频| 成人精品视频一区二区三区| 日韩写真欧美这视频| 亚洲黄色小视频| 波多野结衣视频一区| 欧美xxxxx裸体时装秀| 午夜久久电影网| 91免费视频网| 国产精品私人自拍| 狠狠色丁香婷综合久久| 欧美年轻男男videosbes| 亚洲人妖av一区二区| 高清av一区二区| 久久综合狠狠综合久久激情| 亚洲综合在线电影| 97久久超碰国产精品电影| 久久精品视频一区| 久久成人羞羞网站| 日韩一级欧美一级|