Sulfate disinfection, stabilisation and heavy metal removal from sewage sludge – process description and preliminary results

2002 ◽  
Vol 45 (10) ◽  
pp. 287-292 ◽  
Author(s):  
D. Lowrie ◽  
J. Hobson ◽  
D.C. Stuckey
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Metal Removal ◽  
Electron Flow ◽  
Heavy Metal Removal ◽  
Oxygen Demand ◽  
Hybrid Reactor ◽  
Pathogen Removal ◽  
Primary Sludge ◽  
Preliminary Results

A new, closed loop process for the disinfection, stabilisation and removal of heavy metal from sewage sludge (consisting of a sludge/sulfuric acid reactor, hybrid H2S generator and H2S bioscrubber) is described. Preliminary results for total solids (TS), volatile suspended solids (VSS), chemical oxygen demand (COD), acetate and propionate destruction in the hybrid H2S generator have shown that digestion efficiency is not compromised in a hybrid reactor generating H2S compared to a methanogenic reactor. 70% of the electron flow in the hybrid H2S generator was diverted to methane at a COD:SO4 ratio of 5.45:1. Enough H2SO4 could be generated from the H2S emitted at this ratio to effect sufficient metal solubilisation and pathogen removal from primary sludge.

Heavy metal removal from sewage sludge under citric acid and electroosmotic leaching processes

2020 ◽  
Vol 242 ◽  
pp. 116822 ◽  
Author(s):  
Degang Ma ◽  
Meizhong Su ◽  
Jingjing Qian ◽  
Qian Wang ◽  
Fanyi Meng ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Citric Acid ◽  
Sewage Sludge ◽  
Metal Removal ◽  
Heavy Metal Removal

Sewage sludge ash to phosphorus fertiliser: Variables influencing heavy metal removal during thermochemical treatment

2008 ◽  
Vol 28 (12) ◽  
pp. 2709-2722 ◽  
Author(s):  
H. Mattenberger ◽  
G. Fraissler ◽  
T. Brunner ◽  
P. Herk ◽  
L. Hermann ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Thermochemical Treatment ◽  
Sewage Sludge Ash ◽  
Phosphorus Fertiliser ◽  
Sludge Ash

scholarly journals Using bioleaching to remove metals from sewage sludge intended for land application

2021 ◽  
Author(s):  
Jun Nie
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Removal Efficiency ◽  
Agricultural Land ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Treatment Plant ◽  
Land Application ◽  
Sulphur Compounds ◽  
Recommended Level

Removal of heavy metal contaminants from sewage sludge is a necessity before it is used as an agricultural fertilizer (biosolid), due to environmental concerns and municipal, provincial and federal regulations. The bioleaching method is recommended as an economical and effective process for the removal of heavy metals from the Ashbridges Bay Treatment Plant (ABTP) sludge, some of them with concentrations exceeding the recommended level by the Ontario Ministry of Agriculture, Food, and Rural Affairs guidelines. The Gram-negative thiobacilli is a group of organisms with physiological and morphological similarity and grows by oxidizing ferrous ion and reduced sulphur compounds. One species of thiobacillus, T. ferrooxidan , was recommended as an effective bacterium for the heavy metal removal from sewage sludge. This research involved the incubation of adapted sludge using fresh raw digested sludge and activated sludge of ABTP. Using adapted sludge for the bioleaching process, the method was tested in a continuously stirred tank reactor (CSTR) in combination with a series of jar tests. Results showed that the metal removal efficiency increases with decreasing pH, and the solids content does not affect the removal efficiency of cupper and zinc very much during short term jar test. The results from the long-term (20-day) CSTR test demonstrated that the high T ferrooxians-contained adapted sludge could remove copper from the sewage sludge of ABTP very effectively, by as much as 79.2%. In comparison, the simultaneous removal efficiency of zinc and cadmium were also studied for the same process and, they are 82.0% and 83.9% respectively. The TSS degradation constant rate during the 20 days' bioleaching was found to be 0.0522 day -1. It is concluded that Ontario should continue to apply sludge to agricultural land, as sludge is an economic alternative, promotes recycling of resources, and is a valuable fertilizer. However, the toxic metals in sludge should be removed from sewage sludge using the bioleaching process to recommended level before it is disposed as a fertilizer for land application.

Principle and Process of Heavy Metal Removal from Sewage Sludge

2000 ◽  
Vol 34 (8) ◽  
pp. 1572-1575 ◽  
Author(s):  
Shiro Yoshizaki ◽  
Tahei Tomida
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Metal Removal ◽  
Heavy Metal Removal

Sewage treatment efficacy and heavy metal removal in moving bed biofilm based treatment plants of northern India

2016 ◽  
Vol 6 (1) ◽  
pp. 115-120 ◽  
Author(s):  
Khalid Muzamil Gani ◽  
Muntjeer Ali ◽  
Ankur Rajpal ◽  
Hitesh Jaiswal ◽  
Absar Ahmad Kazmi
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Sewage Treatment ◽  
Oxygen Demand ◽  
Biofilm Reactor ◽  
Most Probable Number ◽  
Probable Number ◽  
Moving Bed ◽  
Northern India

Moving bed biofilm reactor based sewage treatment plants (STPs) have been installed in northern India over the last decade. As such, there are no performance evaluation studies of this technology in the region. Evaluation of four such STPs was carried out in terms of removal efficiencies of physico-chemical parameters, microbiological parameters and heavy metals. Results showed that the average chemical oxygen demand, biological oxygen demand, total suspended solids, total nitrogen and total phosphorus removal of all STPs ranged from 74 to 91%, 81 to 95%, 79 to 93%, 44 to 80% and 58 to 85%, respectively. Total and thermotolerant (faecal) coliform in the influent and effluent of STPs ranged from 1.5 × 104 to 9.3 × 107 most probable number (MPN)/100 mL and 0 MPN/mL to 2,400 MPN/mL, respectively. Heavy metal concentration (nickel, zinc, cadmium, iron, lead, chromium, and copper) in effluent samples of all the STPs was below Indian discharge limits except lead. Integrated efficiency (IE) of the STPs was also evaluated and the results showed that the actual IE of all STPs was 0–10% larger than standard IE, indicating the suitability of the technology in the region.

scholarly journals Heavy Metal Removal Investigation in Conventional Activated Sludge Systems

2020 ◽  
Vol 6 (3) ◽  
pp. 470-477 ◽  
Author(s):  
Magdi Buaisha ◽  
Saziye Balku ◽  
Şeniz Özalp Yaman
Keyword(s):  
Heavy Metal ◽  
Activated Sludge ◽  
Heterotrophic Bacteria ◽  
Metal Removal ◽  
Waste Water Treatment ◽  
Heavy Metal Removal ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Industrial Plant ◽  
Final Effluent

The combination of industrial and domestic wastewater in municipal WWTPs (waste water treatment plants) may be economically profitable, but it increases the difficulty of treatment, and also has some detrimental effects on the biomass and causes a low-quality final effluent. The present study evaluates the treatment process both in the presence and absence of heavy metals using ASM3 (activated sludge model no.3) so as to improve the model by means of incorporating other novel inhibitory kinetic and settler models. The results reveal that the presence of heavy metal, a case study for copper and cadmium at a concentration of 0.7 mgL−1 in a biological treatment system has a negative effect on heterotrophic bacteria concentration by 25.00 %, and 8.76 % respectively. Meanwhile, there are no important changes in COD (chemical oxygen demand), SS (total suspended solids) and TN (total nitrogen) in the final effluent in the conventional system. However, all these parameters are acceptable and consistent with EU Commission Directives. The results indicate that ASM3 can predict and provide an opportunity of the operation for an activated sludge wastewater treatment plant that receives the effluent from an industrial plant.

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