Conditioning of Wastewater Sludge from Science-Based Industrial Park Using Freezing and Thawing

Chang, M. R.; Chiang, Li-Yun; Lee, D. J.; Liu, J. C.; Wu, Nan-Min; Chen, W. C.; Hsu, Bing-Mu

doi:10.1061/(asce)0733-9372(2004)130:12(1552)

Cited by 12 publications

(8 citation statements)

References 6 publications

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“…Freeze/thaw treatment can considerably improve certain sludge-dewatering characteristics (Lee and Hsu, 1994), (irreversibly) change the floc structure into a more compact form (Lee, 1994), reduce the sludge-bound water content (Lee and Hsu, 1995), eliminate bacteria in the sludge (Sanin et al, 1994;Chu et al, 1999), separate oil from an oily sludge (Jean et al, , 2001, and separate nanoparticles from wastewater sludge (Chang et al, 2004). This treatment process is particularly useful when natural freezing is feasible (Hellstrom and Kvarnstrom, 1997a,b).…”

Section: Introductionmentioning

confidence: 97%

Interaction between wastewater-sludge floc and moving ice front

Tang

Peng

Lee

2006

Chemical Engineering Science

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Section: Introductionmentioning

confidence: 97%

Interaction between wastewater-sludge floc and moving ice front

Tang

Peng

Lee

2006

Chemical Engineering Science

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“…Wastewater from the IC and optoelectronics industries represents 95% of the total flow rate, and 73% of the biochemical oxygen demand (BOD) and the chemical oxygen demand (COD). Fluoride-containing wastewater and chemical mechanical polishing (CMP) wastewater dominate the wastewater stream, in which nano-sized CaF 2 and silica constitute the primary particulate phase (Chuan et al, 2002;Yang et al, 2003;Chang et al, 2004). Individual plants in HSIP must treat their wastewater prior to discharge to the works.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticles in wastewater from a science-based industrial park—Coagulation using polyaluminum chloride

Chang

Lee

Lai

2007

Journal of Environmental Management

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“…Similarly, the irregularity of certain sludge flocs increases the drag forces, and thus increases its chances of being entrapped in the advancing ice front. Chung et al (2003) , whereas other experiments used a constant temperature for freezing and curing , Chang et al, 2004. Warm freezing temperatures will result in low freezing rates, suitable for particle migration, whereas colder curing temperatures will cause the surface water to eventually freeze, further compacting individual sludge particles (Chang et al, 2004, Vesilind and).…”

Section: Sludge Solids Content and Particle Sizementioning

confidence: 99%

“…Subsequent freezing cycles generally did not exert the same amount of force on the sludge flocs, meaning that sludge dewaterability may not be improved by repeated freeze-thaw cycles. Chang et al (2004) studied freeze-thaw treatments on "hard-to-dewater" sludge from an industrial park manufacturing high-tech commodities in Taiwan. Sludge samples were frozen at -16.5°C for 24 hours then thawed at room temperature for 12 hours.…”

Section: Sludge Solids Content and Particle Sizementioning

confidence: 99%

“…Incomplete freezing significantly decreases the effectiveness (Kinsley et al, 2012), while long curing times offer few to no advantages over intermediate curing times of 5 to 15 days . In the experiments by Chang et al (2004) and , curing times as short as 24 and 36 hours were used for small samples, and achieved great results in terms of dewaterability. In the experiments by Martel (1989), curing times of 7, 14 and 84 days reduced typhoid bacilli by 50, 90 and 100% respectively, indicating that the majority of kills are achieved in the first few weeks of freezing.…”

Section: Sludge Solids Content and Particle Sizementioning

confidence: 99%

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Freeze-Thaw Sludge Dewatering and Stabilisation using Ferrate(VI)

Diak¹

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The study examined the individual and combined effects of potassium ferrate (VI) additions and freeze-thaw conditioning for the stabilisation and dewatering of wastewater sludges. The purpose of the research was to develop a simple and effective sludge management approach for remote communities in cold climates.Freeze-thaw sludge dewatering with gravity meltwater drainage reduced the sludge volume by up to 88%, and resulted in approximately 2.4-log inactivation of fecal coliform. For many of the test samples, increasing the time frozen from 1 to 15 days increased the level of inactivation of fecal coliform. However, some samples demonstrated >3-log inactivation of fecal coliform after only 1 day frozen, which suggests that fecal coliform inactivation occurs primarily as a result of the freezing process. Similarly, the freezing temperature did not have a significant effect on the level of inactivation, and increasing the duration of time spent frozen from 1 to 15 days did not improve sludge drainability during thaw, which indicates that particle consolidation, leading to improved sludge dewaterability, occurs during the freezing process.Potassium ferrate(VI) additions followed by a 15-minute reaction period oxidised sludge constituents, which inactivated fecal coliform, reduced the concentrations of odour causing compounds (ammonia and sulphide), and solubilised sludge solids, resulting in an increase in soluble chemical oxygen demand (sCOD), soluble proteins and soluble carbohydrates. Potassium ferrate(VI) additions as low as 1.0 g/L also reduced the concentrations of hormones in sludge.iii Co-treatment of anaerobically digested sludge using 5.0 g/L of potassium ferrate(VI) followed by freeze-thaw with gravity meltwater drainage reduced fecal coliform to <100 colony forming units (CFU)/g dry solids (DS), and dewatered the sludge to >12% total solids (TS), representing an 85% reduction in sludge mass following a 12-hour thawing period. The sludge cake remaining was suitable for land application in terms of fecal coliform under the level 1 criteria for pathogens (CP1) (Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA), 2013). Additionally, raw primary sludge was treated and dewatered to below CP2 limits using 5.1 g/L potassium ferrate(VI) followed by freeze-thaw with gravity meltwater drainage, and to below CP1 limits using <15 g/L pretreatment followed by freeze-thaw.iv

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Conditioning of Wastewater Sludge from Science-Based Industrial Park Using Freezing and Thawing

Cited by 12 publications

References 6 publications

Interaction between wastewater-sludge floc and moving ice front

Interaction between wastewater-sludge floc and moving ice front

Nanoparticles in wastewater from a science-based industrial park—Coagulation using polyaluminum chloride

Freeze-Thaw Sludge Dewatering and Stabilisation using Ferrate(VI)

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