Sewage Sludge and Its Health Risk Assessment: Opportunities and Challenges

Sharma, L. Devarishi; Sarangthem, Indira; Thangjam, Rojeet; Sadhukhan, Rahul; Oinam, Nivedita; Yanglem, Birjeet; Banarjee, Laikhuram; Anal, Hrangbung Jurist; Jatav, Hanuman Singh

doi:10.1007/978-3-030-85226-9_10

Cited by 3 publications

(2 citation statements)

References 66 publications

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“…In terms of waste origin, which must be taken into account, the risk of substance accumulation is more significant when biogas digestates and, particularly, sewage sludge is used [ 5 , 30 ]. Sewage sludge from wastewater treatment plants usually contains not only organic matter and a high nutrient content but also chlorine compounds, metals, pharmaceuticals, and pathogenic organisms [ 31 , 32 , 33 ]. By comparison, digestates, while not being as rich in organic matter, may have lower amounts of some toxic substances such as heavy metals or pharmaceuticals.…”

Section: Introductionmentioning

confidence: 99%

Biogas Digestate and Sewage Sludge as Suitable Feeds for Black Soldier Fly (Hermetia illucens) Larvae

Kofroňová,

Melliti,

Vurm

2024

Toxics

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Hermetia illucens larvae can use organic wastes as a substrate, which makes them an interesting potential feed. However, waste may contain heavy metals, which are limited in feed. Here, we investigated the ability of H. illucens to grow on organic wastes and measured their heavy metal bioaccumulation. The larvae were fed with food waste, biogas digestates, and sewage sludge. When the first adult fly was visible, the tests were stopped and the larvae immediately processed. The samples (wastes before use, larvae after feeding) were analysed for mineral nutrient and heavy metal content using AAS and ICP-OES, respectively. The results show that the weight of the larvae fed with food waste increased sevenfold, which was broadly in line with expectations. Those fed with sewage sludge and digestate from biogas station increased threefold. While the larvae fed with sewage sludge exceeded the limits for heavy metals, particularly Cd and Pb, in feedstock, those fed with biogas digestate and food waste did not. These findings add to the literature showing the suitability of different wastes as H. illucens feed, and the importance of excluding waste contaminated with heavy metals from larvae intended for use as animal feed, or else diverting these larvae to non-feed uses.

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Section: Introductionmentioning

confidence: 99%

Biogas Digestate and Sewage Sludge as Suitable Feeds for Black Soldier Fly (Hermetia illucens) Larvae

Kofroňová,

Melliti,

Vurm

2024

Toxics

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“…The composition of wastewater sludge is complex, containing microbial pathogens, proteins, heavy metals, persistent organic matter, and other substances (Cao et al 2021). If not properly treated, it will generate serious impact on human beings and the environment (Sharma et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Factors affecting the mechanical deep dewatering of sludge from wastewater treatment

Qin

Zhu

Liu

et al. 2023

BioRes

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Effects of pressure, dewatering time, and sludge cake thickness on the dewatering of wastewater sludge by the hydraulic dehydrator under the condition of adding CaO and FeSO4 were analyzed using the response surface method (RSM). It was found that when the parameters of pressure, dewatering time, and sludge cake thickness were changed, the trends of dewatering papermaking sludge and municipal sludge were similar under the condition of raw sludge with 3% CaO and 3% FeSO4. Specifically, the increase of pressure and dewatering time promotes the dewatering effect of wastewater sludge, and the thinner the sludge cake is, the better the dewatering effect. The water content can be affected by the change of pressure, dewatering time, and sludge cake thickness. In response surface analysis, the model F-value and coefficient of determination (R2) were 541.43 and 0.9986, respectively, indicating high significance and good correlation. In the model, the change of pressure, dewatering time, and sludge cake thickness affected the water content of paper sludge. Particularly, the increase of pressure and compression time enhanced the dewatering efficiency. The thinner the sludge cake was, the better the dewatering effect of paper sludge was.

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Phosphorus speciation in sewage sludge and their ashes after incineration as a function of treatment processes

Nilsson,

Karlsson,

Allard

et al. 2024

Waste Manag Res

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Phosphorus (P) is a key component in agricultural fertilizers, but it is also a scarce resource, why its recycling has been thoroughly investigated and one promising resources is sewage sludge. Because of stricter regulations in terms of sludge disposal, thermal treatment (e.g. incineration) has become an attractive option. The incineration process alters the chemical speciation of P in favour to calcium-associated (apatite, apatite phosphorus (AP)) species, which is preferred for P recovery. In order to achieve qualitatively transformation, it is important to identify limiting or promoting factors. This study reports on the impact of iron, aluminium and calcium on the transformation of iron- and aluminium-phosphate (NAIP) to AP species, assessed by studying sludge and ash from 10 municipal wastewater treatment plants in Sweden. The effect of iron and aluminium added in the treatment processes was also evaluated. The obtained results show that high calcium concentration favours formation of AP species in both sludge and ashes, whereas high concentration of iron and aluminium favours formation of NAIP species in the sludge. The transformation from NAIP to AP species is hampered by aluminium, irrespectively of its origin, whereas no such correlations could be seen for iron. Therefore, in order to enable efficient P recovery from sewage sludge ash, the amount of aluminium added in the treatment process, as well as its concentration in influent streams to the treatment plants, must be limited.

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Sewage Sludge and Its Health Risk Assessment: Opportunities and Challenges

Cited by 3 publications

References 66 publications

Biogas Digestate and Sewage Sludge as Suitable Feeds for Black Soldier Fly (Hermetia illucens) Larvae

Biogas Digestate and Sewage Sludge as Suitable Feeds for Black Soldier Fly (Hermetia illucens) Larvae

Factors affecting the mechanical deep dewatering of sludge from wastewater treatment

Phosphorus speciation in sewage sludge and their ashes after incineration as a function of treatment processes

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