On April 29, 2022, under the organization of Sichuan water pollution control service association, Mr. Liu Tao, Secretary General of the association, led nearly 20 people from the environmental protection industry to visit and exchange work on improving the environment in Sichuan.

At the meeting, Mr. Liu Xianqing, chairman of sound environment, and Mr. Yuan Denghui, technical director, warmly welcomed the visitors. Wang Weizhong, manager of sound environmental technology department, introduced sound environment and its invention technology of "biological drying method of urban domestic sludge" to the visitors in detail, In December 2021, the "pilot test" of this invention technology was carried out in the sludge disposal center of Nanchong Economic Development Zone, and the results were reviewed, approved and highly praised by the * group composed of several environmental protection industry *. At the meeting, manager Wang also focused on the technical advantages of this invention technology such as "significant deodorization effect" and "significant degradation of heavy metals", and compared with the existing sludge incineration technology in terms of deodorization effect, energy consumption Production cost and other 12 aspects. The sound environmental "biological drying method of urban domestic sludge" was actively concerned by the participants, and they highly praised Mr. Yuan Denghui and Chairman Liu Xianqing for their environmental protection feelings.

The general managers or senior executives of Sichuan zhongweida environmental protection technology, Beijing qinrunze environmental protection technology, Aoheng environmental protection, Yiming environmental protection, HuaHuo Deyuan, Youchen environmental technology, Pengyao environmental protection, Chengdu new Zhonglian exhibition, Mingfeng pump, Mingzhu pump and Qizhe enterprise management attended the exchange meeting.