Effect of humic substances on the precipitation of calcium phosphate

Song, Yonghui; Hahn, Hermann H.; Hoffmann, Erhard; Weidler, Peter G.

doi:10.1016/s1001-0742(06)60004-1

Cited by 53 publications

(31 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The precipitation usually occurs within the pH range of 8.0 to 11.0. Song et al (2006b) confirmed the formation of HAP through powder X-ray diffraction (XRD) analysis of precipitates. As calcium carbonate is formed first, the lime demand will be, in general, governed by alkalinity (bicarbonate) rather than by the phosphate present.…”

Section: P Precipitation By Calciummentioning

confidence: 69%

See 1 more Smart Citation

Physical–Chemical Processes for Phosphorus Removal and Recovery

Gong

2014

Comprehensive Water Quality and Purification

View full text Add to dashboard Cite

Section: P Precipitation By Calciummentioning

confidence: 69%

“…Song et al (2006b) suggested that at a solution pH 8.0, the calcium precipitation rate and removal efficiency of phosphate were greatly reduced by humic substances, which are considered the major fractions of DOM in the effluents of WWTPs (Imai et al, 2002). As a result, excess calcium dosage is needed at elevated DOM levels.…”

Section: àmentioning

confidence: 99%

Physical–Chemical Processes for Phosphorus Removal and Recovery

Gong

2014

Comprehensive Water Quality and Purification

View full text Add to dashboard Cite

“…Song et al [22] found that the saturation index of Hap is a polynominal function of the solution pH and increases when pH increases from 7 to 11. Hap is a stable Ca-phosphate phase that is likely to be formed in P filters and has been found in filter materials after use [23], [24].…”

Section: Discussionmentioning

confidence: 99%

“…The inhibitory effect is pronounced at pH 8, small at pH 9 and non-existent at pH 10 [23]. This effect has been attributed to the combination of humic substances with Ca, but also to the blocking of active growth sites on newly nucleated Ca-phosphate precipitates by organic matter [23].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

The Effect of Hydraulic Loading Rate and Influent Source on the Binding Capacity of Phosphorus Filters

et al. 2013

View full text Add to dashboard Cite

Sorption by active filter media can be a convenient option for phosphorus (P) removal and recovery from wastewater for on-site treatment systems. There is a need for a robust laboratory method for the investigation of filter materials to enable a reliable estimation of their longevity. The objectives of this study were to (1) investigate and (2) quantify the effect of hydraulic loading rate and influent source (secondary wastewater and synthetic phosphate solution) on P binding capacity determined in laboratory column tests and (3) to study how much time is needed for the P to react with the filter material (reaction time). To study the effects of these factors, a 22 factorial experiment with 11 filter columns was performed. The reaction time was studied in a batch experiment. Both factors significantly (α = 0.05) affected the P binding capacity negatively, but the interaction of the two factors was not significant. Increasing the loading rate from 100 to 1200 L m−2 d−1 decreased P binding capacity from 1.152 to 0.070 g kg−1 for wastewater filters and from 1.382 to 0.300 g kg−1 for phosphate solution filters. At a loading rate of 100 L m−2 d−1, the average P binding capacity of wastewater filters was 1.152 g kg−1 as opposed to 1.382 g kg−1 for phosphate solution filters. Therefore, influent source or hydraulic loading rate should be carefully controlled in the laboratory. When phosphate solution and wastewater were used, the reaction times for the filters to remove P were determined to be 5 and 15 minutes, respectively, suggesting that a short residence time is required. However, breakthrough in this study occurred unexpectedly quickly, implying that more time is needed for the P that has reacted to be physically retained in the filter.

show abstract

Distribution and sources of polycyclic aromatic hydrocarbons in the surface water of Taizi River, Northeast of China

Song

et al. 2013

Environ Monit Assess

View full text Add to dashboard Cite

Spatial and seasonal distribution and sources of 16 polycyclic aromatic hydrocarbons (PAHs), identified as priority pollutants by the US Environmental Protection Agency, were investigated in the surface water of the Taizi River in Liaoning Province, northeast of China. Samples were collected from the mainstream, and tributaries of the Taizi River in dry, wet, and normal seasons. Five important industrial point sources were also monitored. The total PAH concentrations ranged from 454.5 to 1,379.7 ng l(-1) in the dry season, 1,801.6 to 5,868.9 ng l(-1) in the wet season, and 367.0 to 5,794.5 ng l(-1) in the normal season. The total PAH concentrations were significantly increased in the order of wet season > normal season > dry season. The profile of PAHs in the surface water samples was dominated by low molecular weight PAHs particularly with two- and three-ring components in the three seasons, suggesting that the PAHs were from a relatively recent local source. Source identification inferred that the PAHs in the surface water of the Taizi River came from both petrogenic inputs and pyrogenic sources.

show abstract

Effect of humic substances on the precipitation of calcium phosphate

Cited by 53 publications

References 12 publications

Physical–Chemical Processes for Phosphorus Removal and Recovery

Physical–Chemical Processes for Phosphorus Removal and Recovery

The Effect of Hydraulic Loading Rate and Influent Source on the Binding Capacity of Phosphorus Filters

Distribution and sources of polycyclic aromatic hydrocarbons in the surface water of Taizi River, Northeast of China

Contact Info

Product

Resources

About