Title: Study on physico-chemical treatment of effluents from biomass gasifier power generation system

Authors: Sunil L. Narnaware; Samir Vahora

Addresses: Sardar Patel Renewable Energy Research Institute (SPRERI), Vallabh Vidyanagar, Anand, Gujarat, India ' Sardar Patel Renewable Energy Research Institute (SPRERI), Vallabh Vidyanagar, Anand, Gujarat, India

Abstract: The study aimed at a physico-chemical treatment of effluent/wastewater generated from the biomass gasification power generation system. A laboratory study determined the optimum dose of lime (CaOH2) as coagulant and alum (Al₂(SO₄)₃18H₂O) as flocculants in the proportion of 1:1 g/l of effluent which later applied in the field experiment. The field results showed that freshwater used once could be used for two more recirculation by giving physical settling treatment. Thereafter, the chemical treatment with a predetermined dose of lime and alum was given due to increased load of tar and SPM which made possible to use the wastewater two more recirculation. After fifth-time use, the turbidity increased to 118.3 NTU which could not be brought down further with chemical treatment. The cost of chemical treatment for laboratory-grade chemicals was found ₹0.85 per litre of effluent and ₹0.10/litre of effluent for commercial grade chemicals.

Keywords: gasifier; syngas; effluent; tar; physico-chemical treatment.

DOI: 10.1504/IJESD.2022.10042794

International Journal of Environment and Sustainable Development, 2022 Vol.21 No.1/2, pp.138 - 149

Received: 17 Dec 2019
Accepted: 14 Oct 2020
Published online: 02 Dec 2021 *