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- Title
Development and comparison of membrane separation schemes for byproduct recovery from Egyptian rice straw black liquor.
- Authors
Abulnour, Abdelghani M. G.; El Sayed, Marwa M.; Tewfik, Shadia R.; Hani, Heba A.; Sorour, Mohamed H.; Shalaan, Hayam
- Abstract
Background: Recovery of valuable ingredients from black liquor could lead to an environmentally and economically sound bioethanol production technology. In this work, two schemes comprising hybrid membrane systems incorporating ultrafiltration (UF) and nanofiltration (NF) are developed for the recovery of lignin, silica rich and cellulose/hemicellulose hydrolysates byproducts from alkaline pretreated rice straw. Methods: The first scheme (I) comprises UF, NF and thermal vapor compression (TVC), while, the second scheme (II) includes UF, 2 stages of NF and 2 TVC units. Further treatments are suggested to produce solid byproducts with an economic value. Furthermore, material balance of the two schemes based on 1000 m3/d of black liquor and the main design features and comparative direct cost indicators of the main adopted units were deduced using WT Cost II© software. Results: Results revealed that about (80–90%) yield of recovered byproducts from both schemes with equivalent amounts of 9.5, 5.5 and 18.5 ton/d of lignin, silica rich and cellulose/hemicellulose hydrolysates dry products, respectively. Moreover, reusable water recovery approaches 26% and 70% for schemes (I) and (II), respectively. Conclusions: Further, the wastewater generated from scheme (II) is 2.9 times folds scheme (I) which improves the environmental impact of the former. Preliminary cost indicators revealed that both schemes have almost the same total direct capital cost.
- Subjects
RICE straw; MEMBRANE separation; WHEAT straw; SULFATE waste liquor; DIRECT costing; CAPITAL costs; HEMICELLULOSE
- Publication
Bulletin of the National Research Centre, 2022, Vol 46, Issue 1, p1
- ISSN
2522-8307
- Publication type
Article
- DOI
10.1186/s42269-022-00751-x