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Heavy metal contained in sewage sludge prevented the safety resource utilization of sludge and need to be disposed. Survey was conducted to find out main heavy metals in sludge generated in wastewater treatment plants in China and approximate content range of heavy metals in sewage sludge. The results showed that in domestic Cu and Zn were the main heavy metals with concentrations exceed the standard...
The effect of different organic acid on heavy metals removal from sludge was investigated. It indicated that the inhibition of various organic acids on heavy metals removal was substantially discrepant. To different heavy metals, the sensitivity of effect extent was followed as Pb>Cu>Zn. The organic acid with two carbonyls had no negative effect on the growth of sulfur-oxidizing bacteria. As...
The semi-dried sewage sludge was combusted in a 1MW CFB furnace. The emission characteristics of CO, NO and N2O at different temperatures and excess air ratios were studied. The heavy metals distribution was also investigated. With 30% moisture content, the net heating value of sewage sludge is sufficient for auto-thermal combustion without supplementary fuel. The CO concentration in flue gas was...
Direct vermicomposting of fresh sewage sludge by two epigeic earthworm species (Eisenia foetida and Bimastus parvus) was conducted in a lab-scale experimental setup, and the performance was evaluated. The results showed that it was feasible to use both E. fetida and B. parvus to convert fresh sewage sludge without any pretreatment and blending into good quality fertilizer. Direct vermicomposting resulted...
Sludge can be used in agriculture as a fertilizer and soil conditioner. But heavy metals are one of the important factors affecting the sludge for agricultural purpose. In this study, the concentration of Zn, Cu, Pb, Cr, Mn and Ni in seven kinds of sludge from Guangzhou were analyzed and the chemical speciation of heavy metals in the five kinds of sludge were studied. The results showed that the concentration...
Sewage sludge taken from Guilin Wastewater Treatment Plant (WWTP) and elemental sufur(S0) were used as the bioleaching medium and substrate respectively. Acidification effect of sewage sludge, activity of bioleaching microorganism and removal rate of heavy metals were investigated at various temperatures from 10°C to 40°C in the bioleaching process. Where Bioleaching experiments were process was operated...
The production of municipal sludge is very huge. Deposition of municipal sludge usually cause mental pollution, so deal with sludge and eliminate associated pollution is attractive. We focused on strategy of to resolve the sludge pollution through biological methods of agriculture utilization. Weeds of Scirpus planiculmis (SP) were used to remove the heavy metals of Cu, Zn, Pb, Cd, Cr, and Ni in the...
Removals of copper and zinc from municipal sludge from Tianjin Dongjiao Sewage Treatment Plant by using acetic acid - H2O2 way and the removals of heavy metals from municipal sludge extract fluid by using improved acetic acid- ferrite way were studied in experiment. The better technique condition to remove copper and zinc was that the quality concentration of acetic acid was 2 mol/L, the ratio of...
This paper presents sewage sludge to produce an adsorbent for Direct Fast Brown M removal. The optimal conditions for a larger surface area adsorbent were 4 M ZnCl2-immersed sludge pyrolyzed at 550degC for 60 min, the highest BET surface area and micropore area achieves 174 m2/g, and 95 m2/g, respectively. The experiment to adsorb the Direct Fast Brown M waste water was carried out. It is noteworthy...
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