scholarly journals An Aerobic Degradation Model for Landfilled Municipal Solid Waste

2021 ◽  
Vol 11 (16) ◽  
pp. 7557
Author(s):  
Diankun Xiao ◽  
Yunmin Chen ◽  
Wenjie Xu ◽  
Liangtong Zhan
Keyword(s):  
Organic Matter ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Solid Phase ◽  
Exothermic Reaction ◽  
Ammonia Nitrogen ◽  
Aerobic Degradation ◽  
Degradation Model ◽  
Nitrogen Ratio ◽  
Short Time

Municipalities output large amounts of solid waste into landfills, but degradation slows during the middle and late stages of treatment. Therefore, accelerating the treatment of degradable substances to achieve rapid stabilization, excavation, screening, and reuse would increase landfill utility and reduce economic costs. This article provides an aerobic degradation model for landfilled municipal solid waste that includes two types of biochemical reactions. Using degradable solid-phase organic matter and ammonia nitrogen as limiting substrates, an equation describing degradation over time was obtained. Both aerobic organic matter hydrolysis and the synchronous nitrification and denitrification reaction followed a kinetic, first-order equation. The influences of temperature, water content, oxygen concentration, and carbon to nitrogen ratio on the kinetic reactions were considered. Similarly, the exothermic reaction characteristics were considered. The model was applied to two previously conducted experiments. The results showed that the model can accurately reflect the degradation laws of various substances under aerobic degradation conditions. SDC and ammonia nitrogen were rapidly degraded and reached very low levels in a short time under aerobic conditions. This indicated that aeration has a significant effect on the degradation of aged waste, which can be used in the accelerated stabilization of aged landfills in the future.

scholarly journals Process modeling of municipal solid waste compost ash for reactive red 198 dye adsorption from wastewater using data driven approaches

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mohammad Hadi Dehghani ◽  
Mehdi Salari ◽  
Rama Rao Karri ◽  
Farshad Hamidi ◽  
Roghayeh Bahadori
Keyword(s):  
Organic Matter ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Adsorption Process ◽  
Operating Time ◽  
Organic Matter Content ◽  
Order Kinetic ◽  
Box Behnken Design ◽  
Reactive Red 198 ◽  
Msw Compost

AbstractIn the present study, reactive red 198 (RR198) dye removal from aqueous solutions by adsorption using municipal solid waste (MSW) compost ash was investigated in batch mode. SEM, XRF, XRD, and BET/BJH analyses were used to characterize MSW compost ash. CNHS and organic matter content analyses showed a low percentage of carbon and organic matter to be incorporated in MSW compost ash. The design of adsorption experiments was performed by Box–Behnken design (BBD), and process variables were modeled and optimized using Box–Behnken design-response surface methodology (BBD-RSM) and genetic algorithm-artificial neural network (GA-ANN). BBD-RSM approach disclosed that a quadratic polynomial model fitted well to the experimental data (F-value = 94.596 and R2 = 0.9436), and ANN suggested a three-layer model with test-R2 = 0.9832, the structure of 4-8-1, and learning algorithm type of Levenberg–Marquardt backpropagation. The same optimization results were suggested by BBD-RSM and GA-ANN approaches so that the optimum conditions for RR198 absorption was observed at pH = 3, operating time = 80 min, RR198 = 20 mg L−1 and MSW compost ash dosage = 2 g L−1. The adsorption behavior was appropriately described by Freundlich isotherm, pseudo-second-order kinetic model. Further, the data were found to be better described with the nonlinear when compared to the linear form of these equations. Also, the thermodynamic study revealed the spontaneous and exothermic nature of the adsorption process. In relation to the reuse, a 12.1% reduction in the adsorption efficiency was seen after five successive cycles. The present study showed that MSW compost ash as an economical, reusable, and efficient adsorbent would be desirable for application in the adsorption process to dye wastewater treatment, and both BBD-RSM and GA-ANN approaches are highly potential methods in adsorption modeling and optimization study of the adsorption process. The present work also provides preliminary information, which is helpful for developing the adsorption process on an industrial scale.

Influence of the Granulometry of Organic Matter Ashes from Municipal Solid Waste on the Properties of Vitrified Ceramics

2005 ◽  
pp. 552-557
Author(s):  
M.C. Borlini ◽  
B.C. Santos ◽  
R.A. Conte ◽  
Daltro Garcia Pinatti ◽  
Carlos Maurício Fontes Vieira ◽  
...  
Keyword(s):  
Organic Matter ◽  
Municipal Solid Waste ◽  
Solid Waste

scholarly journals Impact of MSWI Bottom Ash Codisposed with MSW on Landfill Stabilization with Different Operational Modes

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Wen-Bing Li ◽  
Jun Yao ◽  
Zaffar Malik ◽  
Gen-Di Zhou ◽  
Ming Dong ◽  
...  
Keyword(s):  
Organic Matter ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Bottom Ash ◽  
Acid Neutralizing Capacity ◽  
Waste Incinerator ◽  
Mswi Bottom Ash ◽  
Neutralizing Capacity ◽  
Leachate Quality ◽  
The Impact

The aim of the study was to investigate the impact of municipal solid waste incinerator (MSWI) bottom ash (BA) codisposed with municipal solid waste (MSW) on landfill stabilization according to the leachate quality in terms of organic matter and nitrogen contents. Six simulated landfills, that is, three conventional and three recirculated, were employed with different ratios of MSWI BA to MSW. The results depicted that, after 275-day operation, the ratio of MSWI BA to fresh refuse of 1 : 10 (V : V) in the landfill was still not enough to provide sufficient acid-neutralizing capacity for a high organic matter composition of MSW over 45.5% (w/w), while the ratio of MSWI BA to fresh refuse of 1 : 5 (V : V) could act on it. Among the six experimental landfills, leachate quality only was improved in the landfill operated with the BA addition (the ratio of MSWI BA to fresh refuse of 1 : 5 (V : V)) and leachate recirculation.

scholarly journals BIOLEACH: A New Decision Support Model for the Real-Time Management of Municipal Solid Waste Bioreactor Landfills

2020 ◽  
Vol 17 (5) ◽  
pp. 1675 ◽  
Author(s):  
Javier Rodrigo-Ilarri ◽  
María-Elena Rodrigo-Clavero ◽  
Eduardo Cassiraga
Keyword(s):  
Organic Matter ◽  
Decision Support ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Real Time ◽  
Time Management ◽  
Biogas Production ◽  
Bioreactor Landfills ◽  
Decision Support Model ◽  
The Real

This paper introduces BIOLEACH, a new decision support model for the real-time management of municipal solid waste bioreactor landfills that allows estimating the leachate and biogas production. Leachate production is estimated using an adaptation of the water balance equation which considers every hydrological component and the water consumed by anaerobic organic matter degradation to create biogas and the leachate recirculation flows pumped from the landfill pond under a bioreactor management scheme. Landfill gas production is estimated considering the leachate formation process as a coupled effect through the production or consumption of water. BIOLEACH uses waste production and climate data at monthly scale and computes leachate production accounting for the actual conditions inside the waste mass. Biogas production is computed simultaneously, considering the available water to adjust the chemical organic matter biodegradation. BIOLEACH is a valuable bioreactor managing tool as it allows calculating the recirculation volume of leachate that ensures optimal moisture conditions inside the waste mass and therefore maximizing biogas production. As an illustrative example of a BIOLEACH application, the model has been applied to a real landfill located in Murcia Region (Spain) showing the economic and environmental benefits derived from leachate superficial recirculation.

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