Coagulation–flocculation studies of tannery wastewater using combination of alum with cationic and anionic polymers

Haydar, Sajjad; Aziz, Javed Anwar

doi:10.1016/j.jhazmat.2009.02.140

Cited by 107 publications

(45 citation statements)

References 18 publications

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“…With a dose of 140 mg/l of aluminum sulphate, the final turbidity was 4.4 NTU, and COD was 134.6 mg/l, obtaining removals of 98.12 % and 81.5 %, respectively. These results are higher than those reported by Haydar et al [22], who using aluminum sulphate on domestic wastewater found turbidity and COD removals of 97 % and 53.3 %, respectively. Guida et al [25] reported similar values to those found in this work, with COD removal of 59 % using the same coagulant.…”

Section: Figcontrasting

confidence: 73%

“…The equipment used was a Phipps & Bird jar test (00702) with rounded jars of 2 liters each, in which the same amount of waste water sample was used. The test began with a rapid mixing at 300 rpm [22], the doses were added to each beaker during rapid stirring, and almost instantly starting counting a minute [3]. Rapid mixing was followed by the flocculation process at 30 rpm for 20 minutes.…”

Section: Coagulation-jar Testmentioning

confidence: 99%

“…These doses were selected based on previous experiences from Water Quality laboratory, Aguas de Manizales S.A. E.S.P., and reports such as Guida et al [25] and Haydar et al [22]. These reports found an optimal doses of aluminum sulfate of 150 mg/l and 100 mg/l, respectively for the treatment of domestic wastewater in Naples (Italy) and Sheikhupura (Pakistan).…”

Section: Coagulation-jar Testmentioning

confidence: 99%

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Treatment of landfill leachate by using lateritic soil as a natural coagulant

Syafalni

Lim

Ismail

et al. 2012

Journal of Environmental Management

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In the last several years, the interest on domestic wastewater treatment has increased due to the rise of water consumption resulted from the world population growth. The excessive use of inorganic coagulants, such as aluminum sulphate, in domestic wastewater treatment processes contributes to generate high negative environmental impacts and risks to living organisms. Besides its low biodegradability, as aluminum sulphate increases metal content in discharged effluents rises, generating toxic sludge. Therefore, searching for clean and sustainable processes for domestic wastewater treatment is important in order to reduce the pollutant discharges into fresh water bodies. In this paper, the potential use of thermal water as a natural coagulant for the domestic wastewater treatment from Manizales city (department of Caldas, Colombia), was studied. The effect of coagulant dose was analyzed and compared with the results of the conventional coagulants. Applying different doses of coagulants in domestic wastewater showed that the best coagulation activity was achieved by adding 35 ml/l of thermal water, and 140 mg/l of aluminum sulphate. In both cases, high turbidity removal efficiency (98.1 %) was achieved. The removal efficiency of Chemical Oxygen Demand (COD) using aluminum sulphate was 81.5 %, and using thermal water was 75.4 %. In conclusion, thermal water has positive coagulation properties; therefore, it is a promising alternative to aluminum sulphate as a natural coagulant on the treatment of domestic wastewater.Keywords: coagulation; domestic wastewater; pollutant removal; thermal water; water treatment. ResumenEl consumo del agua y, por ende, la cantidad de agua residual producida, ha venido aumentado, proporcionalmente, con el crecimiento de la población. El excesivo uso de coagulantes inorgánicos, como el sulfato de aluminio, en los procesos de tratamiento de agua residual doméstica, contribuye a generar altos impactos negativos y riesgos para los organismos vivos; además, estos tienen baja biodegradabilidad, incrementan el contenido de metales en los efluentes y generan lodos tóxicos. En consecuencia, la búsqueda de procesos limpios y sostenibles para Use of thermal water as a natural coagulant for domestic wastewater sustainable treatment el tratamiento de aguas residuales domésticas se ha incrementado en los últimos años, como alternativa para reducir los contaminantes que son vertidos en aguas superficiales. En este trabajo se estudió el potencial uso del agua termal como coagulante natural para el tratamiento del agua residual doméstica de la ciudad de Manizales (departamento de Caldas, Colombia). El efecto de la dosis de agua termal como coagulante fue analizado y comparado con los resultados obtenidos en las mismas condiciones con el coagulante convencional (sulfato de aluminio). Se encontró una dosis óptima igual a 140 mg/l para sulfato de aluminio y de 35 ml/l para el agua termal, obteniendo porcentajes de remoción de turbiedad de 98,1 % en ambos coagulantes. Finalmente, se encontró que el ...

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Section: Figcontrasting

confidence: 73%

Section: Coagulation-jar Testmentioning

confidence: 99%

Section: Coagulation-jar Testmentioning

confidence: 99%

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Treatment of landfill leachate by using lateritic soil as a natural coagulant

Syafalni

Lim

Ismail

et al. 2012

Journal of Environmental Management

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“…The combination of coagulants with anionic polymers as a coagulant aid for CEPT of wastewater also exhibited better removal efficiencies for pollutants [31,32]. The combined uses of anionic polyacrylamide (APAM) with coagulants in wastewater treatment have been reported as resulting in a number of benefits, for example: improving efficiency in removing pollutants while saving coagulants; and producing less sludge volumes with good dewaterability [31][32][33].…”

Section: Efficiencies Of Combined Use Of Fecl 3 and Apam In Ceptmentioning

confidence: 99%

“…The combined uses of anionic polyacrylamide (APAM) with coagulants in wastewater treatment have been reported as resulting in a number of benefits, for example: improving efficiency in removing pollutants while saving coagulants; and producing less sludge volumes with good dewaterability [31][32][33]. In Figure 3, it was shown that the addition of APAM can increase COD removal efficiencies for CEPT, while no obvious effects were noted for TP removal.…”

Section: Efficiencies Of Combined Use Of Fecl 3 and Apam In Ceptmentioning

confidence: 99%

Using Chemically Enhanced Primary Treatment (CEPT) as a Pretreatment Option for Anaerobic Digestate from Cattle Manure Digestion System

Gong

Luo

et al. 2017

Water

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Anaerobic digestate from cattle manure fermentation may pose a threat to the environment. How to stabilize the digestate's characteristics so that they do not disturb the bio-system is a critical issue for digestate management. Chemically enhanced primary treatment (CEPT) was investigated as a pretreatment option for digestate treatment. The performance of CEPT for digestate management was carried out under rapid mixing (200 r/min) and slow stirring (40 r/min), respectively. The optimal dosage of ferric chloride (FeCl 3 ) was 40 mg/L. The combination of FeCl 3 and anionic polyacrylamide (APAM) had no obvious influence on TP removal, while COD removal efficiency was improved by 15.4%. The digestate pH and temperature remained stable for CEPT application and required no adjustment. The results indicate that CEPT was effective and feasible in enhancing the removal of COD and TP for digestate pretreatment by using FeCl 3 and APAM.

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