scholarly journals Potential of anaerobic co-digestion in improving the environmental quality of agro-textile wastewater sludge

2020 ◽  
Author(s):  
Jean G. Tapsoba ◽  
Hans C. Komakech ◽  
Johnson Odera Ouma
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Environmental Quality ◽  
Oxygen Demand ◽  
Wastewater Sludge ◽  
Effluent Treatment ◽  
Cow Dung ◽  
Biogas Yield ◽  
Textile Sludge

Abstract Sludge from textile effluent treatment plants (ETP) remains a challenge for many industries due to inefficient and limited waste management strategies. This study explores the potential of using anaerobic digestion (AD) to improve the environmental quality of textile ETP sludge. The AD of ETP sludge is affected by the low C/N ratio (3.7), heavy metal content, and toxicity. To improve the process, co-digestion of ETP sludge with different substrates (sewage sludge, cow dung, and sawdust) under mesophilic conditions (37 °C), followed by a thermochemical pretreatment was assessed. The results showed that anaerobic co-digestion of the textile sludge with the co-substrates is effective in reducing pollution load. It was found that organic matters degraded during the 30-day AD process. The chemical oxygen demand and biological oxygen demand reduction was in the range of 33.1–88.5% and 48.1–67.1%, respectively. Also, heavy metal (cadmium, lead, iron, and, mercury) concentration was slightly reduced after digestion. Maximal biogas yield was achieved from co-digestion of textile sludge and sewage sludge at a mixing ratio of 3:1, 1:1, and 1:3, and methane content was respectively 87.9%, 68.9%, and 69.5% of the gas composition. The results from this study show that co-digestion will not only reduce the environmental pollution and health risks from the textile industry but also recover useful energy.

Assessment of Environmental Quality of Soil Fertilized Grapefruit Trees with Municipal Sewage Sludge

2013 ◽  
Vol 671-674 ◽  
pp. 2736-2741
Author(s):  
Yin An Ming ◽  
Tao Tao
Keyword(s):  
Sewage Sludge ◽  
Environmental Quality ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Land Application ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Limiting Factor

To reuse municipal sewage sludge safely, experiment was carried out on grapefruit trees fertilized with composted sludge from Shiweitou Sewage Treatment Plant in Xiamen City of China, and a method was introduced of how to assess the environmental quality of grapefruit trees soil fertilized with sludge by Set Pair Analysis (SPA) model. The results showed that the soil in the surface layer (0-15cm) and the deeper layer (15-30cm) was less clean, and the environment of soil was not polluted. Thus it was feasible to use sludge as fruit fertilizer. The maximum service life of sludge for continuous land application was estimated by taking Cd as the limiting factor, which would provide scientific guide and technical support for safe land application of sludge.

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.

STUDY OF THE POSSIBILITY OF USING MICROWAVE RADIATION FOR THE TREATMENT OF LIQUID MUNICIPAL WASTE

2018 ◽  
Vol 8 (1) ◽  
pp. 44-49
Author(s):  
Viktor I. KICHIGIN ◽  
Marina V. ZEMLYANOVA ◽  
Elena A. VYALKOVA
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Activated Sludge ◽  
Electromagnetic Radiation ◽  
Microwave Radiation ◽  
Wastewater Sludge ◽  
Municipal Waste ◽  
Capillary Suction ◽  
Metal Impurities ◽  
Fi Ltration

The article is devoted to the study of the infl uence of microwave electromagnetic radiation (UHF EMP) on the properties of sewage sludge. The possibility of using microwave radiation for their processing is shown. The results of experiments confi rming the positive eff ect of the process under study on the degree and speed of compaction of a mixture of precipitation and activated sludge, improvement of their moisture yield, an increase in the yield of heavy metal impurities in decanted water, a decrease in the specifi c resistance of fi ltration and capillary suction of the sediment, precipitation. A hypothesis is proposed for the eff ect of UHF EMP on wastewater sludge.

Control of heavy metal emission from metal plating industry in a german river basin

1998 ◽  
Vol 38 (4-5) ◽  
pp. 121-129 ◽  
Author(s):  
Harro Bode
Keyword(s):  
Heavy Metal ◽  
Industrial Effluents ◽  
Wastewater Sludge ◽  
Industrial Emissions ◽  
Limit Values ◽  
Metal Plating ◽  
Receiving Waters ◽  
Agricultural Use ◽  
Heavy Metal Emissions

The introduction of clear limits for the indirect discharge of heavy metals in Germany has greatly reduced the emissions from metal plating industry. Despite the more than 500 metal plating workshops within the Ruhr catchment area the current requirements for water quality of riverwater are met in the Ruhr (even the German limit values for drinking water are met). Nevertheless the industrial emissions into the sewers are still above the permitted level and above what routine checks of the industrial effluents lead to believe. Thus with respect to the German wastewater sludge regulation half of the dry sludge solids must be excluded from agricultural use. The complete implementation of legal requirements by all workshops will further diminish the heavy metal emissions into wastewater sludge and receiving waters.

scholarly journals INVESTIGATION OF ETP FACILITIES AND THE INDUSTRIAL EFFLUENTS QUALITY: A CASE STUDY IN NOAKHALI INDUSTRIAL AREA, BANGLADESH

2020 ◽  
Vol 14 (2) ◽  
pp. 151-162
Author(s):  
Md. Shiblur Rahaman ◽  
Fozia Momotaz ◽  
Afrida Nurain ◽  
Protima Sarker ◽  
Sahoko Ichihara
Keyword(s):  
Treatment Plant ◽  
Chloride Concentration ◽  
Oxygen Demand ◽  
Industrial Effluents ◽  
Industrial Area ◽  
Effluent Treatment ◽  
Wastewater Disposal ◽  
Untreated Wastewater ◽  
Under Construction

Untreated wastewater disposal from industries has been a crucial environmental issue for developing countries like Bangladesh. The current study aims to investigate the status of Effluent Treatment Plant (ETP) and the quality of effluents in the Noakhali industrial area, Bangladesh. Total 10 industries were surveyed and the ETP status showed that about 30% of industries do not have ETP facilities and only 30% of industries use their ETP for the treatment of the effluents where the rest of the industry’s ETPs were under construction or exit but not used. Effluent samples were collected from seven locations near the discharge points of various industries. All the physicochemical parameters were determined using standard analytical procedures and analyzed the values comparing with the guideline standard by the Department of Environment (DoE), Bangladesh. The average values of electric conductivity (EC) have exceeded the tolerable limit in maximum effluent samples. On the contrary, the temperature, pH, and total dissolved solids (TDS) values were within the standard limit for all of the collected effluent samples. The chloride concentration of the three effluent samples surpassed the limit. The biological oxygen demand (BOD) and chemical oxygen demand (COD) limit were exceeded for the effluent sampling sites S-6 and S-7 collected near the food and beverage industry. Besides, the maximum dissolved oxygen (DO) values of the effluents were below the standard which indicates poor water quality. Environmental nuisance is producing in Noakhali industrial area as maximum industries have not enough wastewater treatment facilities. Present study demonstrated that it is obvious to operate the ETP regularly for improving the quality of effluents to save our native environment from the harmful effects of wastewater.

scholarly journals ENVIRONMENTAL QUALITY ANALYSIS IN KENDARI BAY IN TERMS OF HEAVY METAL POLLUTANTS : Pb, Cu and Zn

GeoEco ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 12
Author(s):  
Lies Indriyani ◽  
Deniyatno Deniyatno ◽  
Sahindomi Bana ◽  
Ridwan Adi Surya ◽  
Junartin Teke
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Environmental Quality ◽  
Quality Analysis ◽  
Metal Pollutants ◽  
Water And Sediment ◽  
Aas Method ◽  
Heavy Metal Pollutants ◽  
Cu And Zn

<p>Heavy metal is one of the most pollutant loads that endangers the aquatic environment. Not only damaging the aquatic ecosystem, the presence of heavy metals also endangers the human health. This Research aims to determine the levels of heavy metals, especially Pb, Cu and Zn in water and also the sediments inside Kendari Bay waters. To determine the environmental quality of Kendari Bay waters standards, Sampling was carried out at 10 stations and sample analysis was carried out using the AAS method. Data analysis was performed using descriptive methods. The results showed that heavy metals Pb, Cu and Zn in water ranged &lt;0.002 - 0.012 mg / L, for metals ranging from &lt;0.002 - 0.003 mg / L, Cu metals ranged from &lt;0.002 - 0.012 mg / L and Zn metals ranged from &lt;0.002 - 0.003 mg / L, while heavy metals Pb, Cu and Zn in sediments range &lt;0.002 - 0.047 mg / kg, for Pb metals range from 0.052 to 0.047 mg / kg, Cu metals range &lt;0.002 - 0.042 mg / kg and Zn metals range from 0 , 0019 - 0.011 mg / kg. The heavy metal content of Pb, Cu, and Zn in both water and sediment samples has not exceeded the quality standards based on the Decree of the Minister of Environment No.51 of 2004 and USEPA.</p><p><em>Keyword</em><em>s</em><em> : kendari bay, heavy metal, Pb, Cu, Zn</em><em></em></p>

scholarly journals Influence of Digested Sludge Conditioning on the Dewatering Processes and the Quality of Sludge Liquid

2020 ◽  
Vol 27 (1) ◽  
pp. 151-164 ◽  
Author(s):  
Beata Bień ◽  
Jurand D. Bień
Keyword(s):  
Sewage Sludge ◽  
Oxygen Demand ◽  
Ultrasonic Field ◽  
Ammonium Nitrogen ◽  
Digested Sludge ◽  
Capillary Suction ◽  
Combined Action ◽  
Sludge Conditioning ◽  
Combination Of Methods

AbstractTo increase the dewatering effect, sewage sludge should be properly prepared before dewatering. Sludge conditioning is a process whereby sludge solids are treated with chemicals or various other means to improve dewatering characteristics of the sludge by reducing the specific resistance and compressibility of the sludge. The aim of the research was to determine the possibility of increasing the efficiency of sewage sludge dewatering by applying chemical agents and ultrasonic field. Some parameters, such as suspension, chemical oxygen demand (COD), phosphorus and ammonium nitrogen content in sludge supernatant, were also analysed. Digested sludge belonged to the group of hardly dewatered sludge, its capillary suction time (CST) was of high value (2639 s). The lowest CST value (88.5 s) was obtained for the unsonicated sludge prepared only with PIX 113 at a dose of 7.0 mg/g d.m. Both the dose and the type of chemicals used, as well as the time of sonication, had an impact on the changes occurring in sludge properties. The increase in mechanical dewatering efficiency was obtained by using a combination of methods applied for sludge preparation, where the sonication of sludge was used at the preliminary stage and followed by dosing chemical substances. This resulted in the reduction of sludge final hydration and changes of other parameters. In addition, combined action of PIX 113 and Zetag 8180 allowed to reduce the content of suspended solids and COD in sludge supernatant.

Effect of Organic Loading Rate (OLR) of Slurry on Biogas Production Quality

2015 ◽  
Vol 1115 ◽  
pp. 325-330
Author(s):  
Maizirwan Mel ◽  
Nadiah Mohd Suhuli ◽  
Avicenna ◽  
Sany Izan Ihsan ◽  
Ahmad Faris Ismail ◽  
...  
Keyword(s):  
Loading Rate ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Continuous System ◽  
Total Solid ◽  
Organic Loading Rate ◽  
Cow Dung ◽  
Feeding Rates ◽  
Organic Loading ◽  
Biogas Yield

In this study, three different concentration of organic loading rate (OLR) were investigated to examine the effect of the change in the organic loading rate on the efficiency of the biogas production. Daily amount of biogas of different type of organic loading rate (OLR), rates of production of biogas, removal efficiencies of chemical oxygen demand (COD), total solid (TS) matter, volatile solids (VS) matter from the slurry were investigated in 30 days retention tyme using 50 L digester. The digester was operated at different organic feeding rates of 25000 mg/L COD, 50000 mg/L COD, and 75000 mg/L COD. The material used in this system is the fruits waste, vegetables waste and cow dung. The system operated in continuous system. The reactor showed stable performance with the highest quality of methane (concentration about70.3% of CH4) and rate of biogas production is 38.1 L/day with COD reduction of 52.1% during organic loading rate 50000 mg/L COD. As the organic loading rate was increased, the COD degradation and biogas yield decreased. Based on this result, the OLR of 50000 mg/L COD is suggested as design criteria for pilot biogas production.

scholarly journals Physicochemical Analysis of Water Quality of Brook Kuruçay

2016 ◽  
Vol 4 (11) ◽  
pp. 991 ◽  
Author(s):  
Ekrem Mutlu ◽  
Arzu Aydın Uncumusaoğlu
Keyword(s):  
Water Quality ◽  
Heavy Metal ◽  
Surface Water ◽  
Water Samples ◽  
Oxygen Demand ◽  
Total Alkalinity ◽  
Aquatic Life ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations

In this study, through the analyses of water samples taken from 9 stations on the brook between July 2012 and June 2013, we aimed to determine the monthly and seasonal changes in water quality parameters of Brook Kuruçay, to determine the water quality properties, to reveal the pollution problems, to determine the suitability level in terms of aquatic life and to classify the quality of water in accordance with Surface Water Quality Management Regulation’s Inland Surface Water Classes criteria. The study area is located southeast of the Hafik District of Sivas city and the altitude is 2608 m. The water samples were collected from 9 stations established on the brook, and some physicochemical parameters and heavy metal concentrations were analyzed in water samples. The cleaning and maintenance of all of the equipment, land-type measurement tools, and glass sampling containers to be used in sampling were made 1 day before sampling. Sampling tubes were immersed into 15 cm below the water surface for taking water samples. Heavy metal concentrations were determined in the Sivas Provincial Control Laboratory in the same day with sampling (within 5 hours). The total alkalinity, total hardness, ammonium nitrogen, nitrite, nitrate, ammonium azote, phosphate, sulfite, sulfate, chloride, sodium, potassium, suspended solid matter (SSM), chemical oxygen demand (COD), biological oxygen demand (BOD), calcium, magnesium, ferrous, lead, copper, zinc, nickel, mercury and cadmium analyses of water samples were performed. As a result of the analyses, it was determined that, since Brook Kuruçay falls into the water resource class, which is the most sensitive to pollution, the water quality of the brook should be monitored regularly.

Sign in / Sign up

Export Citation Format

Share Document