Ground pollution is a significant environmental concern. However, the methods involving bacteria or flocculation and those involving heating and pressure filtration are difficult to implement; this is because of the difficulty in establishing the treatment conditions, complicated processing systems, and the requirement of expensive treatment equipments.

Sewage sludge, a kind of waste constantly generated in municipalities, has recently been expected to be used as a "biomass fuel" in light of the global warming problem. In order to use dewatered sludge as a fuel, it must be taken out of a sewage treatment plant; however, its "foul odor" makes this task difficult to be performed. This problem can be easily resolved by removing most of the malodorous components from it.

Another environmental issue is the removal of PCBs from the mud that collects in seabeds and riverbeds. One application of this technology is expected to be the recovery of the PCBs.

Algae photosynthesize high-efficiently. However extraction of biocrude oil from algae is difficult since algae contains much water. This technology can resolve the problem.