Nnianim Nsɛm Wɔ asase a ɛkɔ so sakra bere nyinaa a ɛfa nwura ho no mu no, nneɛma a wɔsɛe no a wɔhyehyɛ no yiye na wɔyɛ ho adwuma no abɛyɛ ade titiriw. Nnwinnade a ɛho hia a ɛwɔ saa domain yi mu no mu biako ne trommel screen. Saa cylindrical screening device yi di dwuma titiriw bi wɔ S ɛsono S .

Nnianim Nsɛm Wɔ nneɛma a wɔde di dwuma ne mpaapaemu mfiridwuma ho ahemman mu no, mpaapaemu a egyina density so no da nsow sɛ ɔkwan titiriw a wɔfa so hyehyɛ nneɛma a ɛyɛ heterogeneous. Saa kwan yi gyina nsonsonoe a ɛwɔ nneɛma a ɛyɛ den mu so na ama wɔanya mpaapaemu a etu mpɔn. Wɔ saa techn yi anim .

NKYERƐKYERƐMU Nnwinnade a wɔde di dwuma no di dwuma titiriw wɔ nnwuma a wotu fagude, adansi, ne nneɛma a wɔsan de di dwuma mu denam abotan akɛse ne nneɛma afoforo a wɔtew so ma ɛyɛ asinasin nketenkete a wotumi di ho dwuma no so. Nteaseɛ a ɛwɔ nnwinnadeɛ a wɔde bubu ne ne nnyinasosɛm a ɛwɔ mu no ho hia ma obiara a ɔde ne ho hyɛ Material P .