Revitalization of wastewater from the edible oil industry

Shabbir, Muhammad Asim; Ahmed, Waqar; Khan, Moazzam Rafiq; Ahmad, Talha; Aadil, Rana Muhammad

doi:10.1016/b978-0-12-824044-1.00028-3

Cited by 4 publications

(5 citation statements)

References 78 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most of the nitrogen in liquid digestate (LD) is in the form of ammonia [20], while small amounts of nitrate are also detectable. Ultimately the hydroponic medium should contain nitrate as the major nitrogenous component since high concentrations of ammonia can be toxic to plants [30]. This implies that nitrification [13,15,16] should be performed in addition to organic carbon removal.…”

Section: Resultsmentioning

confidence: 99%

“…It explores the use of a biofilm system to polish liquid digestate from anaerobic digestion in order to remove organic carbon while retaining nitrogen and phosphate. Batch experiments were conducted under mesophilic conditions of 35 • C and neutral pH within the range of 6-8 [30], along with investigations into operational modes. The study presents a successful bioreactor concept for achieving these objectives.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Aerobic Polishing of Liquid Digestate for Preparation of Hydroponic Fertiliser

Mathe,

Ramsumer,

Brink

et al. 2024

Sustainability

View full text Add to dashboard Cite

Nutrient pollution—mainly nitrogen and phosphorus—caused by organic waste continues to impact the environment. The implementation of a circular economy is integral to alleviating these effects. Liquid digestate, which is a byproduct of anaerobic digestion (a waste-valorising process), is a nutrient-dense organic fertiliser with vast applications in agriculture. Using an aerobic polishing unit, this study developed a viable method for the preparation of a hydroponic fertiliser by investigating the effect of pH on the nutrient recycling capabilities of said system. The heterotrophic bacteria present in the biofilm, identified by 16S gene sequencing, are responsible for 90% of organic carbon (as TOC) removal with minimal ammonium loss. This is ideal for promoting optimal nitrification in hydroponic systems in the absence of organic carbon to ensure plant growth is not affected. Although pH 8 was found to be ideal for batch operation, this pH condition resulted in decreased microbial longevity and, therefore, increased ammonification due to microbial decay. Therefore, continuous operation at pH 7 proved to be a better option owing to the ammonium-rich effluent (>220 mg/L) which was produced, which is on par with the nitrogen concentration of a Hoagland solution. The continuous carbon polishing of liquid digestate provides an efficient way of utilising organic fertilisers in hydroponic systems.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aerobic Polishing of Liquid Digestate for Preparation of Hydroponic Fertiliser

Mathe,

Ramsumer,

Brink

et al. 2024

Sustainability

View full text Add to dashboard Cite

show abstract

“…These are characterized by high chemical oxygen demand (COD), oils and grease, phosphates, nitrates, surfactants, and phenolic compounds (Haddaji et al 2022). Discharging this wastewater into nature without any prior treatment will lead to severe environmental pollution and health risks (Shabbir et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Contamination reduction of vegetable oil refinery wastewater using innovative acid and basic chemical flotation processes

Hartal,

Souabi,

Chatoui

et al. 2023

Preprint

View full text Add to dashboard Cite

Vegetable oil refineries produce a large amount of wastewater, creating several environmental problems that threaten aquatic life. These wastewaters present significant challenges for treatment techniques due to their high and complex pollution characteristics. This study presents the application of flotation processes in acid medium or basic medium of vegetable oil refinery wastewater to reduce turbidity, oil, grease, chemical oxygen demand (COD), and phosphorus total, polyphenols, nitrates, phenolic compounds measured at 254 nm and color. Application of acid flotation reduced turbidity (96.9%), COD (79%), nitrate (97.8%), total phosphorus (99.8%), polyphenol (86.6%), absorbance at 254 nm (90.8%), oil and grease (98.5%) and color (96.6%). However, the application of basic flotation showed a reduction in turbidity (25.7%), COD (37.5%), nitrates (91.6%), total phosphorus (88%), polyphenols (66.3%), absorbance at 254 nm (64.7%), oil and grease (68.8%) and color (73.9%). Therefore, this flotation process in an acidic or basic medium can be considered among the most effective processes for reducing wastewater pollution from vegetable oil refineries.

show abstract

“…Moreover, aerobic digestion processes demand a neutral pH operation, which becomes difficult to maintain in certain circumstances. Similarly, nitrification–denitrification processes generate a large amount of sludge, further treatment of which becomes another concern for environmental safety and sustainability 2,7 . Sedimentation using gravity settling is a highly time‐consuming process.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, nitrification-denitrification processes generate a large amount of sludge, further treatment of which becomes another concern for environmental safety and sustainability. 2,7 Sedimentation using gravity settling is a highly time-consuming process. Moreover, experiments conducted on sedimentation of cationic starch particle revealed 25.92% separation efficiency, thus signifying that efficiency of this technology is highly dependent on the particle size.…”

mentioning

confidence: 99%

Treatment of starch‐rich wastewater using fly ash‐based low‐cost tubular ceramic membrane

Goswami

Pugazhenthi

2022

Env Prog and Sustain Energy

View full text Add to dashboard Cite

Implementation of fly ash-based ceramic tubular membranes in starch wastewater treatment can be considered as a cost-effective approach towards treating huge quantities of wastewater generated in starch industries. The membrane used in this work possesses excellent chemical and mechanical stabilities and has average pore size of 0.133 μm and porosity of (40.17 ± 1.04)%. The permeate produced by treating wastewater from all three starch sources, namely corn, wheat, and rice, was absolutely free of total suspended solids and turbidity and contained slight chemical oxygen demand, which is under permissible limit for discharge into natural water bodies as prescribed by Central Pollution Control Board (CPCB), India. Besides, the experiments conducted revealed that along with applied pressure, cross-flow velocity and size of starch granules can also play pivotal roles in determining the extent of flux decline. Moreover, the estimated cost of the fabricated membrane is 250.00 USD/m 2 , signifying that the membrane has affordability for being implemented in starch processing industries of all scale.

show abstract

Revitalization of wastewater from the edible oil industry

Cited by 4 publications

References 78 publications

Aerobic Polishing of Liquid Digestate for Preparation of Hydroponic Fertiliser

Aerobic Polishing of Liquid Digestate for Preparation of Hydroponic Fertiliser

Contamination reduction of vegetable oil refinery wastewater using innovative acid and basic chemical flotation processes

Treatment of starch‐rich wastewater using fly ash‐based low‐cost tubular ceramic membrane

Contact Info

Product

Resources

About