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Innovative use of tire derived aggregate (TDA) in septic field in cold climate
Cornelia Andreea Badila, Qiuyan Yuan
University of Manitoba, Canada
In the new global economy, the management of waste tires has become a central issue for the landfills due to the overwhelming urgency to reduce unsightly tire stockpiles and their environmental hazards. One innovation resulted from the waste tires is tire derived aggregate (TDA) used in the onsite wastewater treatment systems to replace natural aggregate in septic field. The purpose of this study is to a better understanding of chemical and biological nutrient removal mechanisms of wastewater in septic field and if there is any differences in the wastewater treatment between the two aggregate used in this study. A full scale septic field was install in Moosehorn Manitoba, on September 16, 2016. The role of the septic field is to provide good distribution of the liquid wastewater to the surrounding soil where the majority of treatment occurs. In most septic field installations, natural aggregate (stone) is used to distribute the wastewater to the surrounding soil and support biological growth. The existing septic field was evacuated and eight new leaching trenches were constructed. Four trenches were constructed with TDA and the other four trenches were constructed with natural aggregate (lime stone). Bi-weekly sample were taken from the monitoring wells and surrounding soil to exam the chemical and microbial composition of the wastewater and soil. The following parameters were measured: ammonia, phosphorus, zinc, manganese, iron, magnesium, aluminium, copper, lead and silver. The temperature, PH and DO were also measured. The preliminary data showed that all the parameters were below secondary drinking water standards.
Nutrient-varying Fruit Processing Wastewater Treatment Technologies
Joseph Vincent Oppedisano, Ashutosh Singh, Richard G. Zytner
University of Guelph, Canada
Fruit processing is an extremely water-intensive industry, typically producing large volumes of colloidal, high-strength wastewater. If organics, nutrients and other pollutants found in this wastewater are not removed prior to discharge, they pose a threat to the health of humans, ecosystems, and the overall environment. The characteristics of fruit processing wastewater varies depending on the produce being treated, and the operations contributing to the wastewater stream such as pressing, transport, cleaning and sanitization. With global populations surging, the demand for clean water continues to increase; in consequence reducing its availability and affordability for industrial use. Many fruit processing facilities also do not have access to municipal water, forcing collection through other means, making supply costs a limitation. For these reasons, many facilities have adopted in-house reuse and recycling treatment operations, which can include membrane bioreactors (MBRs), ultrafiltration and microfiltration, as well as reverse-osmosis treatment.
Performance Enhancement of Aerobic Granular Sludge Treating Low-strength Wastewater
Abbass Jafari Kang, Qiuyan Yuan
Department of Civil Engineering, University of Manitoba
The effectiveness of anaerobic contact to improve nutrient removal performance and effluent quality of aerobic granules was studied in sequencing batch reactors (SBR). Three identical anaerobic/aerobic SBRs were operated under two operation strategies over four months. During the first stage, plug-flow feeding was applied for a 90 min. anaerobic phase, while in the next stage, 15 min. of feeding followed by 75 min. of anaerobic contact was provided with circulating the liquid through settled biomass. Results indicated that, anaerobic contact increased anaerobic COD utilization from 17-24% to 45-53% with improving mass transfer and consequently, improved phosphorus removal from 63.3 to 92.7%. The anaerobic contact also improved the effluent quality from 87 ± 5 to 46 ± 3 mg/L VSS with prevention of flocs (rapidly-growing organisms) formation. With the application of anaerobic contact, slowly growing organisms dominated the system and solid retention time (SRT) increased from 15 ± 1 to 32 ± 3 days; however, granules’ size, Extracellular polymeric substance (EPS) content, and protein-to-carbohydrate (P/C) ratio decreased with the anaerobic removal of organics.
Prerequisite – a hot air oven pretreatment for anaerobic digestion of lignocellulose waste material
Veluchamy Chitraichamy, Ajay Kalamdhad
Indian Institute of Technology Guwahati, India
This work is focused on optimizing the hot air oven pretreatment conditions (temperature and time) and anaerobic digestion process for the biological bioconversion of pulp and paper mill sludge into biogas in a batch assay. The effectiveness of pretreatment study has done by chemical and compositional analyses. The pretreatment at 80oC for 90 min shows the highest impact on sludge solubilization rate. The soluble chemical oxygen demand and volatile fatty acid were increased by 1.41 and 1.95 times respectively. In addition to that XRD and FT-IR spectroscopic characterization shows the development of aliphatic, unsaturated and carbonyl carbon functionalities in the pretreated samples. FESEM picture also qualities the change in alteration of the structure after the thermal pretreatment. Thus hot air oven pretreatments serve to disrupt the lignocellulosic structure, making the cellulose easily accessible to acidogenic microorganisms. Biochemical methane potential test was carried out to determine the efficacy of hot air oven pretreated and untreated paper mill sludge. The methane production potential was increased from 264 to 303 mL of CH4 g VSremoved-1 in pulp and paper mill sludge after hot air oven pretreatment.
Resource Recovery from Food Processing Facilities Wastewater Treatment
The City of Portage la Prairie is required to meet the Province of Manitoba’s new effluent limits at their Water Pollution Control Facility and will need an upgrade to achieve this. Significant industrial flows to the system include two large potato processing plants and a pea processor, which contribute approximately 90% of the Nitrogen and Phosphorus loads. Process modeling evaluated options, with phosphorus recovery through struvite crystallization followed by nitrogen reduction through deammonification on the industrial wastewaters showing favourable results. The performance of this two-step configuration was evaluated on a pilot scale using the Ostara Pearl® struvite crystallization and Veolia ANITA™Mox deammonification systems. This was the first known time of this technology pairing. Pilot results demonstrated that these technologies could successfully perform well in series, recovering phosphorus and removing nitrogen. The recovered phosphorus is a marketable slow-release fertilizer product. Results confirmed favorable lifecycle costs for full scale implementation, with annual O&M savings of $900,000 and payback under 9 years.