Zhejiang Huaqingyuan Biotech brings innovative waste treatment technology to the 21st China International Expo Appeared at the 21st China Environmental Expo, Zhejiang Huaqingyuan Biotech brought innovative waste treatment technology to the 21st China Environment Expo Zhejiang Huaqingyuan Biotech brings innovative waste treatment technology to the 21st China International Expo Appeared at the 21st China Environmental Expo, Zhejiang Huaqingyuan Biotech brought innovative waste treatment technology to the 21st China Environment Expo Zhejiang Huaqingyuan Biotech brings innovative waste treatment technology to the 21st China International Expo Appeared at the 21st China Environment Expo Zhejiang Huaqingyuan Biotech brought innovative waste treatment technology to the 21st China Environment Expo