TPS/MA/PLA is a blend of thermoplastic starch (TPS) and polylactic acid (PLA) compatibilized by maleic anhydride (MA) that can be a substitute for petro-based plastics in certain applications. At the end of its life, this material must be properly disposed in treatment systems such as composting or anaerobic digestion. The biodegradability of TPS/MA/PLA, PLA, TPS and the non-compatible mixture (TPS/PLA) was evaluated in a slurry thermophilic anaerobic digestion system (STAD) according to ISO 13975-2012 standard. The anaerobic inoculum was prepared from cow manure and the organic fraction of municipal solid waste. After 31 days of incubation, the pure PLA exhibited a 12-day lag phase and 40.41% of biodegradability. TPS, TPS/PLA and TPS/MA/PLA did not exhibit lag phase and reached 92.11%, 65.48% and 64.82% of biodegradation respectively. The slow degradation rate of PLA is attributed to its high glass transition temperature and crystallinity. In TPS/MA/PLA and TPS/PLA, about 50% of PLA and 13% to 10% of the TPS remains undegraded and MA did not affect the biodegradation of TPS/MA/PLA compared to TPS/PLA. Results suggest that, in very short retention times STAD systems, PLA based materials could not exhibit enough biodegradability.

TPS / MA / PLA是热塑性淀粉（TPS）和聚乳酸（PLA）的混合物，并与马来酸酐（MA）相容，可以在某些应用中替代石油基塑料。在其使用寿命结束时，必须将该材料正确处理在堆肥或厌氧消化等处理系统中。根据ISO 13975-2012标准，在浆液嗜热厌氧消化系统（STAD）中评估了TPS / MA / PLA，PLA，TPS和不相容混合物（TPS / PLA）的生物降解能力。厌氧接种物由牛粪和城市固体废物的有机部分制成。孵育31天后，纯PLA表现出12天的滞后阶段和40.41％的生物降解性。TPS，TPS / PLA和TPS / MA / PLA没有出现滞后现象，分别达到92.11％，65.48％和64.82％的生物降解率。PLA的缓慢降解速率归因于其较高的玻璃化转变温度和结晶度。在TPS / MA / PLA和TPS / PLA中，与TPS / PLA相比，约50％的PLA和13％至10％的TPS保持未降解，并且MA不影响TPS / MA / PLA的生物降解。结果表明，在保留时间非常短的STAD系统中，基于PLA的材料无法表现出足够的生物降解性。