Effect of Paper Mill Sludge on Adsorption and Desorption of Cd(II) and Pb(II) in Paddy Soils

There are high organic matter and cation exchange capacity (CEC) in paper mill sludge, which can be used efficiently to amend soil properties and promote the growth of crops. The batch method was used to investigate effects of paper sludge on adsorption and desorption of Cd (II) and Pb (II) in two types paddy soil (red soil, purple soil), through adding paper sludge to red soil and purple soil. The results showed that isothermal sorption process of Cd (II) and Pb (II) by soils and paper sludge could be well described by Langmuir equation and Freundlich equation, and all coefficients (r) were higher than 0.9. The purple soil had a higher sorption capacity of Cd (II) and Pb (II) than red soil. The sorption capacities of Cd (II) and Pb (II) in soils increased after added paper sludge, and they reached adsorption equilibrium as the percentages of paper sludge were 10%, 1% in red soil and purple soil, respectively. The desorption capacities of Cd (II) and Pb (II) in soils decreased after added paper sludge, and they reached minimum as the percentages of paper sludge were 5%, 2% in red soil and purple soil, respectively. It was better to immobilize Cd (II) and Pb (II) after added paper sludge, thus paper mill sludge can relieve the migration of heavy metals in soil-crop systems. It can provide a new way for safe using of heavy metal contaminated soil and resource utilization of paper sludge.

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Effects of Temperature on the Adsorption and Desorption of Tetracycline in Soils

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.344 ◽

2013 ◽

Vol 726-731 ◽

pp. 344-347 ◽

Cited By ~ 5

Author(s):

Yan Jiao Bao ◽

Hong Sheng Ding ◽

Yan Yu Bao

Keyword(s):

Adsorption Capacity ◽

Red Soil ◽

Maximum Adsorption Capacity ◽

Batch Experiments ◽

Adsorption And Desorption ◽

Freundlich Equation ◽

Desorption Isotherms ◽

Effects Of Temperature ◽

Cinnamon Soil ◽

Fitting Parameters

Batch experiments of OECD Guide were conducted to the adsorption and desorption of tetracycline in soils. The adsorption and desorption isotherms of tetracycline in cinnamon soil and red soil were expressed well by the Freundlich equation at 20, 25 and 35°C. According to lg Kf and 1/n values of fitting parameters, tetracycline was strongly adsorbed by two soils with adsorption capacity (lg Kf) values from 3.06 to 3.59. Temperature from 20 to 30°C had little effects on the tetracycline adsorption in two soils. Thermodynamic parameters depict the exothermic nature of adsorption, and the process was favorable and spontaneous. Hysteresis effect was observed. The maximum adsorption capacity and hysteresis index of tetracycline were found at 20°C for cinnamon soil and 30°C for red soil, so there was little risk of tetracycline remobilization with temperature lower than 25°C in cinnamon soil or higher than 25°C in red soil.

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Utilization of a small soda pulp and paper mill effluent for rice field irrigation

Water Science & Technology ◽

10.2166/wst.1997.0519 ◽

1997 ◽

Vol 35 (2-3) ◽

pp. 205-212 ◽

Cited By ~ 2

Author(s):

H. T. Adisesha ◽

S. Purwati ◽

P. R. Panggabean ◽

S. E. Sarief

Keyword(s):

Soil Analysis ◽

Paper Mill ◽

Exchange Capacity ◽

Pulp And Paper ◽

Rice Fields ◽

Chemical Recovery ◽

Pulp And Paper Mill ◽

Paper Mill Effluent ◽

Soda Pulp ◽

Paddy Crop

Padalarang pulp and paper mill, a soda pulp and paper mill without chemical recovery, located near Bandung, Indonesia, discharges untreated effluent mixed with domestic waste water into surrounding rice fields. For more than 60 years, paddy has been harvested 3 times a year. An in-depth study to characterize the effluent, the soil and the biomass production was conducted to define the evidence. A field study using four experimental plots indicated that soil irrigated with effluent had a higher concentration of potassium, calcium, sodium ions and greater cation exchange capacity than near-by soil. Analysis of well water showed that the effluent had no effect on the ground water. A reduction of suspended solids and BOD occurred in the effluent while flowing through rice fields. The yields of paddy demonstrated significant positive effect of effluent either in dry or in rainy season, while zeolites as soil amendment did not give significant effect to the already high paddy crop yield.

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