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Leaching of phosphorus from incinerated sewage sludge ash by means of acid extraction followed by adsorption on orange waste gel

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Journal of Environmental Sciences 2009年第12期21卷 1753-1760页

作者： Biplob Kumar Biswas Katsutoshi Inoue Hiroyuki Harada Keisuke Ohto Hidetaka Kawakita Department of Applied Chemistry Saga University

ashes from sewage sludge incineration have a high phosphorus content, approximately 8% （W/W）, which indicates a potential resource of the limiting nutrient. Incineration of sewage sludge with subsequent recovery of phosphorus is a relatively new sludge treatment technique. In this article, the leaching of phosphorus by using sulfuric acid as well as hydrochloric acid by means of several batch experiments was presented. At the same time a selective recovery of phosphorus by adsorption was also discussed. The effects of acid concentration, temperature and time on extraction were studied. The phosphorus leaching increased with the increase in acid concentration and temperature. Kinetic studies showed that the complete leaching of phosphorus took place in less than 4 h. Selective adsorption of phosphorus by using orange waste gel provided a hint for recovery of this natural resource, which eventually could meet the ever-increasing requirement for phosphorus. The overall results indicated that the incinerated sewage sludge ash can be treated with acid to efficiently recover phosphorus and thus can be considered a potentially renewable source of phosphorus.

关键词： sewage sludge ash phosphorus metals acid extraction recovery

Leaching behavior of phosphorous compounds from sewage sludge ash based on quantitative X-ray diffraction analysis

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Waste Disposal and Sustainable Energy 2020年第2期2卷 113-125页

作者： Pinjing He Xiaotong Zhang Fan Lü Liming Shao Hua Zhang Institute of Waste Treatment and Reclamation College of Environmental Science and EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Phosphorus(P)is an essential and limited resource.Incineration sewage sludge ash(ISSA)contains a high amount of P,which can be recovered using chemical leaching methods.However,the recovery ratio depends on the speciation of P and the leaching conditions.In this study,hydrochloric acid was used as a leaching agent,and the effects of the hydrochloric acid concentration,leaching time,temperature,and liquid-solid ratio on the P leaching ratio were investigated.Furthermore,the co-leaching of macro-metals Ca,Al,Fe,and Mg was analyzed.The results showed that P leached rapidly within 30 min,where the leaching rate reached more than 80%and then gradually stabilized.The leaching concentrations of Ca and Mg had a significant correlation(correlation coefficient r^(2)>0.90),and both were leached completely.Al and P had similar leaching patterns,where the leaching rates increased initially and then decreased with time at 0.2 mol/L HCl.According to X-ray diffraction analysis and Rietveld refinement,the P in ISSA was mainly present in the forms of Mg_(3)Ca_(3)(PO_(4))_(4) and AlPO_(4).When leached using 0.2 mol/L HCl at 55℃ with a liquid-to-solid ratio of 20 L/kg,the AlPO_(4) and Fe_(3)(H_(2)O)_(3)(PO_(4))_(2) in ISSA dissolved initially and then precipitated on the surface of the solid phase,thereby impeding further P leaching.

关键词： sewage sludge ash Acid leaching Phosphorous speciation Quantitative X-ray diffraction analysis Rietveld refinement

Removal of Cu(Ⅱ) from Wastewater Using Acidified sewage sludge ash

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Journal of China University of Geosciences 2004年第3期15卷 290-294页

作者： GanYiqun WangYanxin ZhangCongjun SchoolofEnvironmentalStudies ChinaUniversityofGeosciencesWuhan430074China

sewage sludge ash (SSA), the waste generated in sewage sludge incineration, was obtained from Wuhan sewage Treatment Plant and used as a low-cost sorbent for removing Cu(Ⅱ) from wastewaters. The sorbent was first modified with 5 % sulfuric acid to increase its sorption capacity. The specific surface area, porosity, cation-exchange capacity (CEC) and pH ZPC of the sorbent were measured. Batch experiments were made to study the effect of contact time, solution pH value and temperature on sorption. Both Langmuir and Freundlich models well described the Cu(Ⅱ) sorption process, with correlation coefficient (R 2) values of 0.993 4 and 0.989 9 respectively. And the sorption process follows the Lagergren first order kinetic model. The equilibrium sorption capacity of acidified SSA to Cu(Ⅱ) is estimated to be 7.78 mg/g under optimal conditions.

关键词： sewage sludge ash Cu(Ⅱ) removal acidification sorption.

Flow analysis of major and trace elements in residues from large-scale sewage sludge incineration

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Journal of Environmental Sciences 2021年第4期33卷 99-109页

作者： Siyuan Yu Hua Zhang Fan Lü Liming Shao Pinjing He State Key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092China Institute of Waste Treatment&Reclamation College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Increase of sewage sludge(SS)has led to the construction of more incineration plants,exacerbating to the production of SS incineration residues.However,few studies have considered the mass balance of elements in large-scale SS incineration plants,affecting the residues treatment and utilization.In this study,flow analysis was conducted for major and trace elements in the SS,the fly ash(sewage sludge ash,SSA)and bottom ash from two large-scale SS incineration plants.The elemental characteristics were compared with those of coal fly ash(CFA),and air pollution control residues from municipal solid waste incineration(MSWIA),as well as related criteria.The results showed that the most abundant major element in SSA was Si,ranging from 120 to 240 g/kg,followed by Al(76–348 g/kg),Ca(26–113 g/kg),Fe(35–80 g/kg),and P(26–104 g/kg),and the trace elements were mainly Zn,Ba,Cu,and Mn.Not all the major elements were derived from SS.Most trace elements in the SS incineration residues accounted for 82.4%–127%of those from SS,indicating that SS was the main source of trace elements.The partitioning of heavy metals in the SS incineration residues showed that electrostatic precipitator ash or cyclone ash with high production rates were the major pollutant sinks.The differences in some major and trace elements could be indicators to differentiate SSA from CFA and MSWIA.Compared with related land criteria,the pollutants in SSA should not be ignored during disposal and utilization.

关键词： sewage sludge ash sewage sludge incineration Electrostatic precipitator ash Cyclone ash Flow analysis Mass balance