Liu Dan's main research direction.

(1) solid waste treatment and recovery;

(2) Engineering environment control.

Main tasks undertaken at present:

1. Project of the Ministry of Railways "Study on Railway Waste Treatment Technology and Complete Equipment in Qinghai-Tibet Plateau" (1);

2. Sichuan Project "Research on Key Technologies of Semi-aerobic Bioreactor Landfill" (1);

3. Chengdu Project "Field Experimental Study on Quasi-aerobic Sanitary Landfill Technology" (1);

4. National Natural Science Foundation Project: "Study on Generation and Migration of Municipal Landfill Leachate under the Conditions of Stability, Seepage and Chemical Coupling"