scholarly journals Improving energy efficiency of electrochemical blackwater disinfection through sequential reduction of suspended solids and chemical oxygen demand

2018 ◽  
Vol 2 ◽  
pp. 50 ◽  
Author(s):  
Brian T. Hawkins ◽  
Tate W. Rogers ◽  
Christopher J. Davey ◽  
Mikayla H. Stoner ◽  
Ewan J. McAdam ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Chemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Electrochemical Treatment ◽  
Pathogen Inactivation ◽  
Industry Standards ◽  
Order Of Magnitude ◽  
Sequential Reduction

Onsite reuse of blackwater requires removal of considerable amounts of suspended solids and organic material in addition to inactivation of pathogens. Previously, we showed that electrochemical treatment could be used for effective pathogen inactivation in blackwater, but was inadequate to remove solids and organics to emerging industry standards. Further, we found that as solids and organics accumulate with repeated recycling, electrochemical treatment becomes less energetically sustainable. Here, we describe a pilot study in which concentrated blackwater is pretreated with ultrafiltration and granular activated carbon prior to electrochemical disinfection, and show that this combination of treatments removes 75-99% of chemical oxygen demand, 92-100% of total suspended solids, and improves the energy efficiency of electrochemical blackwater treatment by an order of magnitude.

scholarly journals Improving energy efficiency of electrochemical blackwater disinfection through sequential reduction of suspended solids and chemical oxygen demand

2019 ◽  
Vol 2 ◽  
pp. 50 ◽  
Author(s):  
Brian T. Hawkins ◽  
Tate W. Rogers ◽  
Christopher J. Davey ◽  
Mikayla H. Stoner ◽  
Ewan J. McAdam ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Chemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Electrochemical Treatment ◽  
Pathogen Inactivation ◽  
Industry Standards ◽  
Order Of Magnitude ◽  
Sequential Reduction

Onsite reuse of blackwater requires removal of considerable amounts of suspended solids and organic material in addition to inactivation of pathogens. Previously, we showed that electrochemical treatment could be used for effective pathogen inactivation in blackwater, but was inadequate to remove solids and organics to emerging industry standards. Further, we found that as solids and organics accumulate with repeated recycling, electrochemical treatment becomes less energetically sustainable. Here, we describe a pilot study in which concentrated blackwater is pretreated with ultrafiltration and granular activated carbon prior to electrochemical disinfection, and show that this combination of treatments removes 75-99% of chemical oxygen demand, 92-100% of total suspended solids, and improves the energy efficiency of electrochemical blackwater treatment by an order of magnitude.

scholarly journals Wastewater treatment in flow photobioreactors continuous illuminated by artificial and solar light

2020 ◽  
Vol 9 (6) ◽  
pp. e183963748
Author(s):  
Rafael Souza Leopoldino Nascimento ◽  
Ludymyla Marcelle Lima Silva ◽  
Lucas Periard ◽  
Anibal da Fonseca Santiago
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Continuous Flow ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Operational Stability ◽  
Artificial Light ◽  
Light Emitting

The technology of microalgae photobioreactors and illuminated by LEDs has been widely studied for the treatment of wastewater. However, sunlight is a free resource and should be taken advantage of. But the question remains whether photobioreactors illuminated by natural (sunlight) light in combination with artificial light can have greater operational stability or greater performance when compared to systems illuminated only by artificial light. In this context, continuous flow photobioreactors illuminated by Light Emitting Diodes (LEDs) combined, or not, with sunlight were operated and had their performance evaluated. The variables analyzed were pH, OD, chemical oxygen demand (COD), chlorophyll - a and total suspended solids. The photobioreactors were effective for removing organic matter, with 75 ± 15% in the photobioreactor illuminated by LED and 65 ± 10% in the photobioreactor illuminated by sunlight and LED. The results showed that the use of combined lighting favors the production of dissolved oxygen and ensures greater operational stability in the removal of carbonaceous organic matter.

Accuracy of different sensors for the estimation of pollutant concentrations (total suspended solids, total and dissolved chemical oxygen demand) in wastewater and stormwater

2013 ◽  
Vol 68 (2) ◽  
pp. 462-471 ◽  
Author(s):  
Mathieu Lepot ◽  
Jean-Baptiste Aubin ◽  
Jean-Luc Bertrand-Krajewski
Keyword(s):  
Chemical Oxygen Demand ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Detection Methods ◽  
Time Step ◽  
Pollutant Concentrations ◽  
Uv Visible ◽  
Wet Weather

Many field investigations have used continuous sensors (turbidimeters and/or ultraviolet (UV)-visible spectrophotometers) to estimate with a short time step pollutant concentrations in sewer systems. Few, if any, publications compare the performance of various sensors for the same set of samples. Different surrogate sensors (turbidity sensors, UV-visible spectrophotometer, pH meter, conductivity meter and microwave sensor) were tested to link concentrations of total suspended solids (TSS), total and dissolved chemical oxygen demand (COD), and sensors' outputs. In the combined sewer at the inlet of a wastewater treatment plant, 94 samples were collected during dry weather, 44 samples were collected during wet weather, and 165 samples were collected under both dry and wet weather conditions. From these samples, triplicate standard laboratory analyses were performed and corresponding sensors outputs were recorded. Two outlier detection methods were developed, based, respectively, on the Mahalanobis and Euclidean distances. Several hundred regression models were tested, and the best ones (according to the root mean square error criterion) are presented in order of decreasing performance. No sensor appears as the best one for all three investigated pollutants.

scholarly journals Effluent Quality of Wet Process Coffee Processing Factories in Coffee Growing Ecological Zones in Burundi

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Bisekwa E ◽  
Njogu PM ◽  
Kufa-Obso T
Keyword(s):  
Chemical Oxygen Demand ◽  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Processing Technology ◽  
Ecological Zones ◽  
Wet Process ◽  
Wastewater Samples ◽  
Field And Laboratory Conditions

Arabica coffee is cultivated by smallholders for commercial purposes, and it is commonly processed using wet Coffee Processing Technology. Burundi has more than 250 Coffee Processing factories which discharge their effluents to water bodies. The goal of this study was to determine the levels of physicochemical parameters in wastewater from Coffee Processing Technology factories in major coffee growing ecological zones in Burundi. Wastewater samples were collected from 19 sites representing private, public and cooperative owned coffee processing stations. Physicochemical analyses were determined in-situ field and laboratory conditions using standard procedures. Results indicate that the wastewater does not meet Burundi Effluent Discharge standards for Total Suspended solids, Chemical Oxygen Demand, Biochemical Oxygen Demand, pH. The data revealed that the wet coffee processing pollutes the environment in terms of pH, Total Suspended solids, Chemical Oxygen Demand, Biochemical Oxygen Demand. There is need to install quality polishing technologies to treat the water before disposal.

scholarly journals The efficiency of the sand filtration unit mixed with different packing materials in drain water treatment in Egypt

2021 ◽  
Vol 11 (6) ◽  
Author(s):  
Khaled Abd el naser I. Ibrahim ◽  
Tarek Ismail M. Sabry ◽  
Ahmed S. El-Gendy ◽  
Sayed I. A. Ahmed
Keyword(s):  
Chemical Oxygen Demand ◽  
Removal Efficiency ◽  
Suspended Solids ◽  
Low Cost ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Infiltration Rate ◽  
Drain Water ◽  
Sand Filter ◽  
Filtration Unit

AbstractIn an attempt to improve the quality of the agricultural drain in Egypt for its reuse again in the irrigation, low-cost solution such as sand filter along with/without other filtration media has been used in this research. As a result of that, pilot plant of sand filter mixed with other filtration media was tested for its ability to improve the sand performance in removing the suspended solids and organic matters from agricultural drain water of the Belbeis drain (in Sharkia governorate in Egypt). Sand only, sand mixed with sponge, sand mixed with activated carbon and sand mixed with ceramic cylinders have been tested to find the best media combination and optimum mixing sand/ medium ratio and optimum infiltration rate. The work has been done on four runs. It was found that sand mixed with ceramic cylinders gave the best removal efficiency with respect to total chemical oxygen demand and chemical oxygen demand for solution which were 77, 74%, respectively, whereas sand mixed with sponge had the best removal efficiency with respect to total suspended solids which was 89%. Also, all tested media combination had effluent quality that complied with Egyptian law 48 for the year 1982 regarding the disposal of wastewater into agricultural drains (chemical oxygen demand ≤ 80 mg/l, total suspended solids ≤ 50 mg/l).

scholarly journals Phytoremediation of landfill leachate using Ipomoea aquatica and Pistia stratiotes

2021 ◽  
Vol 42 (3(SI)) ◽  
pp. 775-781
Author(s):  
M.M. Hanafiah ◽  
◽  
N.I.H.A. Aziz ◽  
A.A. Halim ◽  
L.S. Shamdin ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Chemical Oxygen Demand ◽  
Landfill Leachate ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Pistia Stratiotes ◽  
Ipomoea Aquatica ◽  
Physico Chemical ◽  
Significant Difference

Aim: In this study, Ipomoea aquatica and Pistia stratiotes were used to remove total suspended solids, chemical oxygen demand and ammoniacal nitrogen (NH3-N) from the landfill leachate collected at Ampar Tenang Closed Landfill (ATCL) site in Dengkil, Selangor, Malaysia. Methodology: The physico-chemical characteristics of landfill leachate (pH, temperature, NH3-N, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, total dissolved solids, total suspended solids, salinity, electrical conductivity and nitrite as well as selected heavy metals were determined before phytoremediation treatment. Results: The physico-chemical properties of leachate samples were found to be lower as compared to the standards set by the government, except for COD (>100 mg l-1). Heavy metals content, Na, Mg and Fe was high in leachate. It was found that the concentrations of NH3-N, COD and TSS in leachate decreased by 57.64%, 26.85% and 62.05% after treatment with Ipomea aquatica, respectively. Whereas, 61%, 32% and 74.7% removal rate was observed for NH3-N, COD and TSS, post-treatment by Pistia stratiotes. One-way ANOVA analysis for Ipomoea aquatica revealed insignificant difference (p>0.05) but for Pistia stratiotes there was a significant difference (p<0.05) in the reduction of TSS, COD and NH3-N concentrations. Interpretation: Based on the findings, Pistia stratiotes was found more effective than Ipomea aquatica for reducing TSS, COD and NH3-N concentrations from landfill leachate.

scholarly journals KHẢ NĂNG CHỐNG CHỊU, HIỆU QUẢ XỬ LÝ CHẤT Ô NHIỄM TRONG NƯỚC THẢI CHĂN NUÔI SAU BIOGAS CỦA THỦY TRÚC (Cyperus alternifolius) VÀ CỎ NẾN (Typha orientalis)

2021 ◽  
Vol 226 (07) ◽  
pp. 151-159
Author(s):  
Lương Thị Thúy Vân ◽  
Bùi Thị Kim Anh ◽  
Chu Mạnh Nhương ◽  
Phạm Thương Giang
Keyword(s):  
Chemical Oxygen Demand ◽  
Total Nitrogen ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Typha Orientalis ◽  
Tu 5 ◽  
Cyperus Alternifolius

Từ thực trạng chất lượng nước thải sau biogas tại các trang trại chăn nuôi lợn, nghiên cứu đã lựa chọn hai loài thực vật thủy sinh để xử lý nước thải theo định hướng nghiên cứu ứng dụng công nghệ bãi lọc trồng cây nhân tạo. Thí nghiệm được thiết kế nhằm đánh giá khả năng chống chịu COD, NH4+ và pH của Thủy trúc (Cyperus alternifolius) và Cỏ nến (Typha orientalis) thông qua khả năng sinh trưởng ở các nồng độ khác nhau. Cả hai loài thực vật cho sinh khối ổn định trong dải pH từ 5 đến 9, nồng độ COD đến 1000 mg/L và nồng độ NH4+ từ 50 đến 250 mg/L. Hiệu suất xử lý TSS (Total Suspended Solids – Tổng chất rắn lơ lửng), COD (Chemical Oxygen Demand – Nhu cầu oxy hóa học), NH4+, T-N (Total Nitrogen – Tổng nitơ) của Thủy trúc tương ứng là 85,9%, 76,8%, 76,8%, 66,8% và Cỏ nến là 85,4%, 66,5%, 61,5%, 52,0%. Chất lượng nước thải sau xử lý đều đạt quy chuẩn cho phép đối với nước thải chăn nuôi (QCVN62-MT:2016/BTNMT, cột B). Tuy nhiên, Thủy trúc có ưu thế hơn nhờ khả năng chống chịu tối ưu, hiệu quả xử lý và thời gian xử lý các chất ô nhiễm của loài thực vật này.

scholarly journals Electrocoagulación en el agua de proceso de una Industria de alimentos

2019 ◽  
pp. 48-52
Author(s):  
María Guadalupe Martin del Campo-Sanchez ◽  
José Luis Escobar-Gonzalez
Keyword(s):  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Contact Time ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Statistical Test ◽  
Parallel Plates ◽  
Cost Of Treatment ◽  
Approximate Cost

The main objective was to develop a wastewater treatment system by means of the electrocoagulation method according to the parameters of Chemical Oxygen Demand (COD) and Total Suspended Solids (SST). The results obtained were that at a pH of 6 and 7 with a contact time of 30 minutes, the highest percentage of removal of SST (98%) and COD (90%) was obtained. Once the conductor was selected, tests were carried out at different pH (6, 7 and 8) with contact times of 15, 30 and 45 minutes each, at 12 V and 0.4 A. A Multifactorial ANOVA statistical test was performed to determine if there were significant differences between the treatments. Once the results were evaluated, a prototype of approximately 38 L was designed with parallel plates with results of removal of SST of 93% and COD of 66%. The approximate cost of treatment per cubic meter is $ 35

Sign in / Sign up

Export Citation Format

Share Document