Removal of coagulant aluminum from water treatment residuals by acid

Okuda, Tetsuji; Nishijima, Wataru; Sugimoto, Mayo; Saka, Naoyuki; Nakai, Satoshi; Tanabe, Kazuyasu; Ito, Junki; Takenaka, Kenji; Okada, Mitsumasa

doi:10.1016/j.watres.2014.04.041

Cited by 74 publications

(19 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nevertheless, the potential for excessive P restriction, particularly in already-P-deficient agricultural soils, remains a factor that must be considered in relation to planning land application of WTRs. One potential solution in such a situation was presented by Okuda et al (2014), who demonstrated that by treating WTRs with sulphuric acid (principally to reduce the Al concentration via leaching), the plant availability of P within the WTRs increased. The authors found that Japanese mustard spinach (Brassica rapa var.…”

Section: Immobilisation Of Contaminants and Excess Nutrients In Soilmentioning

confidence: 99%

Potential Alternative Reuse Pathways for Water Treatment Residuals: Remaining Barriers and Questions—a Review

Turner

Wheeler²,

Stone³

et al. 2019

Water Air Soil Pollut

View full text Add to dashboard Cite

Water treatment residuals (WTRs) are byproducts of the coagulation and flocculation phase of the drinking water treatment process that is employed in the vast majority of water treatment plants globally. Production of WTRs are liable to increase as clean drinking water becomes a standard resource. One of the largest disposal routes of these WTRs was via landfill, and the related disposal costs are a key driver behind the operational cost of the water treatment process. WTRs have many physical and chemical properties that lend them to potential positive reuse routes. Therefore, a large quantity of literature has been published on alternative reuse strategies. Existing or suggested alternative disposal routes for WTRs can be considered to fall within several categories: use as a pollutant and excess nutrient absorbent in soils and waters, bulk land application to agricultural soils, use in construction materials, and reuse through elemental recovery or as a wastewater coagulant. The main concerns and limitations restricting current and future beneficial uses of WTRs are discussed within. This includes those limitations linked to issues that have received much research attention such as perceived risks of undesirable phosphorous immobilisation and aluminium toxicity in soils, as well as areas that have received little coverage such as implications for terrestrial ecosystems following land application of WTRs.

show abstract

Section: Immobilisation Of Contaminants and Excess Nutrients In Soilmentioning

confidence: 99%

Potential Alternative Reuse Pathways for Water Treatment Residuals: Remaining Barriers and Questions—a Review

Turner

Wheeler²,

Stone³

et al. 2019

Water Air Soil Pollut

View full text Add to dashboard Cite

show abstract

“…DWTS and solids within filter backwash water (FBWW) are the major components of water treatment residual. Okuda et al [1] have reported that global production of solid residuals ''might be totally 10,000 tons per day,'' of which European countries including Ireland, Germany, the Netherlands, United Kingdom, and Portugal make up 10.38%, and the United States and Chinese Taiwan account for 72.6% and 0.003%, respectively [2]. An increased generation of water treatment residues, coupled with environmental restrictions on disposal methods, has led to increased research into their reuse, which is an important avenue in realizing a reduction and reclamation of total waste residues.…”

Section: Introductionmentioning

confidence: 99%

The removal characteristics of natural organic matter in the recycling of drinking water treatment sludge: Role of solubilized organics

Zhou

Yang

et al. 2016

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

To clarify the role of solubilized organics derived from drinking water treatment sludge (DWTS) in the elimination of natural organic matter (NOM) in the DWTS recycling process, a probe sonoreactor at a frequency of 25 kHz was used to solubilize the organics at varied specific energies. The coagulation behavior related to NOM removal in recycling the sonicated DWTS with and without solubilized organics was evaluated, and the effect on organic fractionations in coagulated water was determined. The study results could provide useful implications in designing DWTS recycling processes that avoid the enrichment of organic matter. Our results indicate that DWTS was disrupted through a low release of soluble chemical oxygen demand (SCOD) and proteins, which could deteriorate the coagulated water quality under the specific energy of 37.87-1212.1 kW h/kg TS. The optimal coagulation behavior for NOM removal was achieved by recycling the sonicated DWTS without solubilized organics at 151.5 kW h/kg TS specific energy. Recycling the sonicated DWTS could increase the enrichment potential of weakly hydrophobic acid, hydrophilic matter, and <3 kDa fractions; the enrichment risks could be reduced by discharging the solubilized organics. Fluorescent characteristic analysis indicated that when recycling the sonicated DWTS without solubilized organics, the removal of humic-like substances was limited, whereas removal of protein-like substances was enhanced, lowering the enrichment potential of protein-like substances.

show abstract

“…DWTS and solids within filter backwash water are known as the main components of water treatment residual. Okuda et al [1] report that global production of solid residuals 'might be totally 10,000 tons per day', of which the European countries including Ireland, Germany, Netherland, United Kingdom and Portugal take up 10.38%, and the United States and Chinese Taiwan accounts for 72.6% and 0.003%, respectively [2]. The increasing generation of water treatment residues, coupled with environmental restraints regarding their current disposal outlets, has prompted increased research toward their reuse.…”

Section: Introductionmentioning

confidence: 99%

“…The main issues focused upon are: (1) to evaluate the effect of ultrasound frequency at 25 and 40 kHz with low energy density of 0.03 W/ ml on organic solubilization and the flocs characteristics, as well as the microbial activity via a bath (C)/probe (T) sonoreactor; (2) to elucidate the DWTS disintegration degree and microbial activity after the DWTS subjected to higher energy densities (1, 3 and 5 W/ ml) with frequency of 25 kHz using the probe sonoreactor.…”

Section: Introductionmentioning

confidence: 99%

Characterization of drinking water treatment sludge after ultrasound treatment

Zhou

Yang

et al. 2015

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

Ultrasonic technology alone or the combination of ultrasound with alkaline or thermal hydrolysis as pretreatment for anaerobic digestion of activated sludge has been extensively documented. However, there are few reports on ultrasound as pretreatment of drinking water treatment sludge (DWTS), and thereby the characteristic variability of sonicated DWTS has not been fully examined. This research presents a lab-scale study on physical, chemical and biological characteristics of a DWTS sample collected from a water plant after ultrasonic treatment via a bath/probe sonoreactor. By doing this work, we provide implications for using ultrasound as pretreatment of enhanced coagulation of recycling sludge, and for the conditioning of water and wastewater mixed sludge by ultrasound combined with polymers. Our results indicate that the most vigorous DWTS disintegration quantified by particles' size reduction and organic solubilization is achieved with 5 W/ml for 30 min ultra-sonication (specific energy of 1590 kWh/kg TS). The Brunauer, Emmett and Teller (BET) specific surface area of sonicated DWTS flocs increase as ultra-sonication prolongs at lower energy densities (0.03 and 1 W/ml), while decrease as ultra-sonication prolongs at higher energy densities (3 and 5 W/ml). Additionally, the pH and zeta potential of sonicated DWTS slightly varies under all conditions observed. A shorter sonication with higher energy density plays a more effective role in restraining microbial activity than longer sonication with lower energy density.

show abstract

Removal of coagulant aluminum from water treatment residuals by acid

Cited by 74 publications

References 23 publications

Potential Alternative Reuse Pathways for Water Treatment Residuals: Remaining Barriers and Questions—a Review

Potential Alternative Reuse Pathways for Water Treatment Residuals: Remaining Barriers and Questions—a Review

The removal characteristics of natural organic matter in the recycling of drinking water treatment sludge: Role of solubilized organics

Characterization of drinking water treatment sludge after ultrasound treatment

Contact Info

Product

Resources

About