Treatment and enhanced degradation of petrochemical wastewater by continuous stirred tank reactor

Currently, the world is facing two coexisting problems-1) the proper management of wastes generating from the industrial sectors, and 2) the scarcity for novel resources of gasoline to meet up energy demand of civilization. Anaerobic codigestion, a sustainable green technology presents an outstandin...

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Main Author:	Siddique, Md. Nurul Islam
Format:	Thesis
Language:	English
Published:	2012
Subjects:	TD Environmental technology Sanitary engineering
Online Access:	http://umpir.ump.edu.my/id/eprint/3657/1/CD6305_NURUL_ISLAM_SIDDIQ.pdf
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spelling	my-ump-ir.36572021-08-16T05:31:45Z Treatment and enhanced degradation of petrochemical wastewater by continuous stirred tank reactor 2012-09 Siddique, Md. Nurul Islam TD Environmental technology. Sanitary engineering Currently, the world is facing two coexisting problems-1) the proper management of wastes generating from the industrial sectors, and 2) the scarcity for novel resources of gasoline to meet up energy demand of civilization. Anaerobic codigestion, a sustainable green technology presents an outstanding opportunity both for energy conversion and pollution control. It has a wide variety of applications treating numerous wastewaters such as agro-agricultural, industrial, municipal, domestic sewage etc. Therefore, it has become a core method with meticulous attraction treating organic wastes on account of its economic benefits of energy generation. The continuous stirred tank reactor (CSTR) can be defined as a sealed-tank digester equipped with mixing facility. Chemical pretreatment coupled with anaerobic co-digestion technology was applied on petrochemical wastewater using CSTR focusing on enhanced hydrolysis and methanogenesis. Particularly, batch experiments were performed, with applied H2O2 doses of 0.5, 1 and 1.5% for contact times of 5, 10 and 15 min. Results revealed that 1% H2O2 dose (1.0mM Fe3+2) for 5 min exposure elevated biodegradability index (BOD/COD) up to 35%. Catalase activity scavenged the toxicity on microbes. Subsequently, batch experiments were employed, with various mixing proportions of petrochemical wastewater (PWW): dairy cattle manure (DCM): beef cattle manure (BCM), such as 25: 37: 38, 40: 30: 30, 50: 25: 25, 60: 20: 20, and 75: 12: 13. Results revealed that PWW: DCM: BCM ratio (50: 25: 25) provided maximum methane production. Hence, CSTR was operated with this specific feed ratio. Effect of temperature and organic loading was also verified. Batch test operation was also performed for ammonium bicarbonate (NH4HCO) dosing avoiding volatile fatty acid (VFA) accumulation. Specific dosing limit was selected up to 40 mg/L. A 10 mg/L of NH4HCO3 3 dosing was proved suitable. Although methane production is considered to get introverted by VFA accumulation leading to reactor instability during anaerobic digestion, the co-digestion of PWW together with BCM and DCM caused 50% enhancement in methane production, followed by a 98±0.5% reduction in chemical oxygen demand at 10 days hydraulic retention time. No VFA buildup was identified, demonstrating that reactors were not running at stress-overloading situations. In comparison with the digestion of PWW alone, methane yield increased by 50–60% under mesophilic conditions and 50–65% under thermophilic conditions due to codigestion. This was induced by an optimum C: N ratio (30:1) of the feed stock ensuring microbial growth and buffering capacity. This study provides guidelines for kinetic analysis of the viability of transforming PWW to bioenergy. 2012-09 Thesis http://umpir.ump.edu.my/id/eprint/3657/ http://umpir.ump.edu.my/id/eprint/3657/1/CD6305_NURUL_ISLAM_SIDDIQ.pdf application/pdf en public masters Universiti Malaysia Pahang Faculty of Civil & Environmental Engineering
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	TD Environmental technology Sanitary engineering
spellingShingle	TD Environmental technology Sanitary engineering Siddique, Md. Nurul Islam Treatment and enhanced degradation of petrochemical wastewater by continuous stirred tank reactor
description	Currently, the world is facing two coexisting problems-1) the proper management of wastes generating from the industrial sectors, and 2) the scarcity for novel resources of gasoline to meet up energy demand of civilization. Anaerobic codigestion, a sustainable green technology presents an outstanding opportunity both for energy conversion and pollution control. It has a wide variety of applications treating numerous wastewaters such as agro-agricultural, industrial, municipal, domestic sewage etc. Therefore, it has become a core method with meticulous attraction treating organic wastes on account of its economic benefits of energy generation. The continuous stirred tank reactor (CSTR) can be defined as a sealed-tank digester equipped with mixing facility. Chemical pretreatment coupled with anaerobic co-digestion technology was applied on petrochemical wastewater using CSTR focusing on enhanced hydrolysis and methanogenesis. Particularly, batch experiments were performed, with applied H2O2 doses of 0.5, 1 and 1.5% for contact times of 5, 10 and 15 min. Results revealed that 1% H2O2 dose (1.0mM Fe3+2) for 5 min exposure elevated biodegradability index (BOD/COD) up to 35%. Catalase activity scavenged the toxicity on microbes. Subsequently, batch experiments were employed, with various mixing proportions of petrochemical wastewater (PWW): dairy cattle manure (DCM): beef cattle manure (BCM), such as 25: 37: 38, 40: 30: 30, 50: 25: 25, 60: 20: 20, and 75: 12: 13. Results revealed that PWW: DCM: BCM ratio (50: 25: 25) provided maximum methane production. Hence, CSTR was operated with this specific feed ratio. Effect of temperature and organic loading was also verified. Batch test operation was also performed for ammonium bicarbonate (NH4HCO) dosing avoiding volatile fatty acid (VFA) accumulation. Specific dosing limit was selected up to 40 mg/L. A 10 mg/L of NH4HCO3 3 dosing was proved suitable. Although methane production is considered to get introverted by VFA accumulation leading to reactor instability during anaerobic digestion, the co-digestion of PWW together with BCM and DCM caused 50% enhancement in methane production, followed by a 98±0.5% reduction in chemical oxygen demand at 10 days hydraulic retention time. No VFA buildup was identified, demonstrating that reactors were not running at stress-overloading situations. In comparison with the digestion of PWW alone, methane yield increased by 50–60% under mesophilic conditions and 50–65% under thermophilic conditions due to codigestion. This was induced by an optimum C: N ratio (30:1) of the feed stock ensuring microbial growth and buffering capacity. This study provides guidelines for kinetic analysis of the viability of transforming PWW to bioenergy.
format	Thesis
qualification_level	Master's degree
author	Siddique, Md. Nurul Islam
author_facet	Siddique, Md. Nurul Islam
author_sort	Siddique, Md. Nurul Islam
title	Treatment and enhanced degradation of petrochemical wastewater by continuous stirred tank reactor
title_short	Treatment and enhanced degradation of petrochemical wastewater by continuous stirred tank reactor
title_full	Treatment and enhanced degradation of petrochemical wastewater by continuous stirred tank reactor
title_fullStr	Treatment and enhanced degradation of petrochemical wastewater by continuous stirred tank reactor
title_full_unstemmed	Treatment and enhanced degradation of petrochemical wastewater by continuous stirred tank reactor
title_sort	treatment and enhanced degradation of petrochemical wastewater by continuous stirred tank reactor
granting_institution	Universiti Malaysia Pahang
granting_department	Faculty of Civil & Environmental Engineering
publishDate	2012
url	http://umpir.ump.edu.my/id/eprint/3657/1/CD6305_NURUL_ISLAM_SIDDIQ.pdf
_version_	1783731903418859520

Treatment and enhanced degradation of petrochemical wastewater by continuous stirred tank reactor

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