Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering & Architecture, Beijing, 100044, PR China.
Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering & Architecture, Beijing, 100044, PR China.
Water Res. 2020 Mar 1;170:115298. doi: 10.1016/j.watres.2019.115298. Epub 2019 Nov 11.
Handling excess sludge produced by wastewater treatment is a common problem worldwide. Due to limited space available in landfills, as well as difficulties involved in using excess sludge in agriculture, there is a need for alternative disposal methods. Although anaerobic digestion (AD) is widely used in processing sludge, only partial energy recovery from methane and sludge volume reduction can be achieved, resulting in a substantial amount of sludge remaining, which needs to be disposed of. Direct incineration after sludge drying is one possible option, a practice that is already in place in some cities in China. A comparison between direct incineration and conventional AD (with or without pretreatment by thermal hydrolysis) has to be made with respect to the energy balance and investment & operational (I & O) costs. This comparison reveals direct incineration to have the lowest energy deficit and I & O costs. Therefore, it is expected that direct incineration without AD will become the preferred sustainable approach to handling sludge.
处理废水处理产生的剩余污泥是一个全球性的常见问题。由于垃圾填埋场的可用空间有限，以及在农业中使用剩余污泥的困难，需要替代处理方法。虽然厌氧消化（AD）在处理污泥方面得到广泛应用，但只能从甲烷中部分回收能量并减少污泥体积，导致大量剩余污泥需要处理。污泥干燥后直接焚烧是一种可能的选择，中国的一些城市已经在采用这种做法。必须对直接焚烧与传统 AD（有或没有热水解预处理）进行比较，比较能源平衡和投资与运营（I & O）成本。比较结果表明，直接焚烧的能源赤字和 I & O 成本最低。因此，预计不进行 AD 的直接焚烧将成为处理污泥的首选可持续方法。
