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Wastewater Engineering Treatment Disposal And Reuse

The anaerobic digestion technology has been in existence for centuries and its underlying theory established for decades. It is considered a useful technology for the generation of renewable energy ...

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A Review of the Chemistry of Anaerobic Digestion : Methods of Accelerating and Optimizing Process Efficiency

Extensive and improper utilization of water from industrial, municipal, and agricultural activities generate 380 trillion L/y of wastewater worldwide. Wastewaters from different sources contain enormous amounts of nutrients such as carbon, nitrogen, and phosphorus. Thus, the recovery of these nutrients via appropriate sustainable process becomes a necessity. Among various processes microalgae-based technologies has attracted considerable attention and its strategies for sustainable and low-cost treatment of wastewater has allowed removal of over 70% nutrient loads from the wastewater. After the treatment of wastewater, the harvested microalgae biomass contains value-added biomolecules which can used for bioenergy production and nanoparticle synthesis. At present, high operational costs represent a major limitation for the development of microalgae-based biorefineries. Thus, the main aim of the review is to provide the knowledge about the potential of low-cost microalgae-based integrated biorefinery for wastewater treatments and resource recovery. Also, this review provides the insight of microalgae biomass-based bioenergy products, nanoparticles synthesis their application within the concept of circular bioeconomy. Furthermore, this review also provides information on different established industries which used microalgae for wastewater treatment.

Microalgae-based biorefineries for sustainable resource recovery from wastewater

Palm oil mill effluent (POME) is generated from the sterilization, condensation and hydrocycloning of palm oil in mills. If the effluent is discharged into the aquatic and terrestrial ecosystem without treatment, it could lead to high biological oxygen demand (BOD), chemical oxygen demand (COD) and acidic pH of the receiving waters. Biogas consisting mostly of methane, carbon dioxide, and to a lesser hydrogen has been produced through anaerobic treatment of this toxic effluent. The process of biogas production involves microbial synthesis involving hydrolysis, acidogenesis, acetogenesis and methanogenesis. Biogas is formed during anaerobic degradation of POME by indigenous microbial communities. This review updates the current state of art of biogas production through anaerobic digestion of POME using different configurations of reactors such as fluidized bed reactor, anaerobic filtration, up-flow anaerobic sludge blanket (UASB) reactor, anaerobic contact digestion, up-flow anaerobic sludge fixed-film (UASFF) reactor, modified anaerobic baffled bioreactor (MABB), anaerobic baffled bioreactor (ABR), continuous stirred tank reactor (CSTR), expanded granular sludge bed (EGSB) reactor, Ultrasonicated membrane anaerobic system (UMAS), Ultrasonic-assisted Membrane Anaerobic System (UAMAS), membrane anaerobic system (MAS)and upflow anaerobic sludge blanket reactor (UASBR). The factors that influences biogas yield during treatment include pH, temperature (environmental factors), organic loading rate (OLR), hydraulic retention time (HRT), mixing rate, pressure, equilibrium, nutrient and microbial activities (Internal factors). Based on this study, UAMAS is the best configuration for methane production from POME during anaerobic treatment. Biogas from POME could contribute to energy sources of oil palm producing nations, while preventing the attendant environmental impacts associated with its disposal.

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A review of biogas production from palm oil mill effluents using different configurations of bioreactors

Advances in bioleaching for recovery of metals and bioremediation of fuel ash and sewage sludge.

The anaerobic bioreactor applies the principles of biotechnology and microbiology, and nowadays it has been used widely in the wastewater treatment plants due to their high efficiency, low energy use, and green energy generation. Advantages and disadvantages of anaerobic process were shown, and three main characteristics of anaerobic bioreactor (AB), namely, inhomogeneous system, time instability, and space instability were also discussed in this work. For high efficiency of wastewater treatment, the process parameters of anaerobic digestion, such as temperature, pH, Hydraulic retention time (HRT), Organic Loading Rate (OLR), and sludge retention time (SRT) were introduced to take into account the optimum conditions for living, growth, and multiplication of bacteria. The inner components, which can improve SRT, and even enhance mass transfer, were also explained and have been divided into transverse inner components, longitudinal inner components, and biofilm-packing material. At last, the newly developed special inner components were discussed and found more efficient and productive.

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Characteristics, process parameters, and inner components of anaerobic bioreactors

In order to improve the bioleaching efficiency of arsenic-rich gold concentrates, a mixed bacterial flora had been developed, and the mutation breeding method was adopted to conduct the research. The original mixed bacterial flora had been enrichedin acid mine drainage of Dexing copper mine, Jiangxi Province, China. It was induced by UV (ultraviolet), ultrasonic, and microwave, and their combination mutation. The most efficient bacterial flora after mutation was collected for further bioleaching of arsenic-rich gold concentrates. Results indicated that the bacterial flora after mutation by UV 60&#x2009;s combined with ultrasonic 10&#x2009;min had the best oxidation rate of ferrous, the biggest density of cells, and the most activity of total protein. During bioleaching of arsenic-rich gold concentrates, the density of the mutant bacterial cells reached to cells/mL at 15 days, more than 10 times compared with that of the original culture. The extraction of iron reached to 95.7&#x25; after 15 days, increased by 9.9&#x25; compared with that of the original culture. The extraction of arsenic reached to 92.6&#x25; after 12 days, which was increased by 46.1&#x25;. These results suggested that optimum combined mutation could improve leaching ability of the bacterial flora more significantly.

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Bioleaching of Arsenic-Rich Gold Concentrates by Bacterial Flora before and after Mutation

Shock resistance characteristic of a spiral symmetry stream anaerobic bio-reactor.

Rheological behaviors of anaerobic granular sludge in a spiral symmetry stream anaerobic bioreactor.

The comparison of symmetrical spiral stream anaerobic bioreactor (SSSAB), to three compartmentalized anaerobic bioreactor (TCAB) and upflow anaerobic sludge blanket reactor (UASB) were carried out, the performance, affecting factors, kinetics reaction and sludge features were studied with the same operational conditions under room temperature. The results showed that: the average COD removal efficiency of SSSAB (88%) was higher than that of TCAB and UASB (80% and 78 %). The first-order kinetic constant of SSSAB was 5.4 d -1 , higher than that of TCAB (3.6 d -1 ) and UASB (2.2 d -1 ). In macro scale, compared with that from TCAB and UASB, the anaerobic granular sludge from SSSAB was clearer, more black and denser. Moreover, the surface of anaerobic granular sludge from SSSAB was rough and full of channels. The total amount of extracellular polymeric substance (EPS) of anaerobic granular sludge from SSSAB was higher than that of TCAB and UASB, which provided conditions for mass transfer between sludge and substrates. The protein (PN)/ polysaccharide (PS) ratio of the sludge from SSSAB was lowest, which might indicate that it had more favorable strength and settling ability. The distribution of flocculability of the sludge from SSSAB was more reasonable, and its fluctuation was smaller compared with that from UASB.

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Awad Abdelgadir

Papers

Characteristics, process parameters, and inner components of anaerobic bioreactors

Bioleaching of Arsenic-Rich Gold Concentrates by Bacterial Flora before and after Mutation

Shock resistance characteristic of a spiral symmetry stream anaerobic bio-reactor.

Rheological behaviors of anaerobic granular sludge in a spiral symmetry stream anaerobic bioreactor.

Affecting Factors and Kinetics of New Developed Symmetrical Spiral Stream Anaerobic Bioreactor (SSSAB) for Wastewater Treatment