scholarly journals Efficiency and reliability of membrane processes in a water reclamation plant

2015 ◽  
Vol 5 (2) ◽  
pp. 166-176 ◽  
Author(s):  
Mohamed F. Hamoda ◽  
Meshari AL-Harbi ◽  
Hasan AL-Ajmi
Keyword(s):  
Suspended Solids ◽  
Reclaimed Water ◽  
Oxygen Demand ◽  
Plant Performance ◽  
Process Efficiency ◽  
Water Reclamation ◽  
Total Coliforms ◽  
Normal Probability ◽  
Normal Probability Distribution ◽  
Efficiency And Reliability

Performance of a water reclamation plant using ultrafiltration (UF) and reverse osmosis (RO) treating 280,000 m3/d of wastewater was evaluated over 1 year. Statistical analyses were performed on flow rate, temperature, pH, total suspended solids (TSS), total dissolved solids (TDS), biochemical oxygen demand (BOD5) and total coliforms. Variations in flow rates coincided with those in temperature, both being seasonal, but plant performance was not highly influenced by such variations. The RO system recovered 85% of water flow. Data on process variables conform to a normal probability distribution and reveal the high process efficiency and reliability of UF and RO systems. Plant efficiencies were >99% for TSS, TDS, BOD5 and total coliforms. Efficiencies were the highest for TSS and total coliforms in the UF system, while they were the highest for TDS and BOD5 in the RO system. Cumulative frequency distribution analyses indicate that RO plays an important role in maintaining a stable plant performance and high quality reclaimed water. The UF system proved essential for complimenting successful performance of the RO system. Reclaimed water satisfies, at 99% frequency, the quality standards for potable water concerning TSS, TDS, BOD5 and total coliforms even though membranes have been operating continuously for 6 consecutive years.

Synergistic degradation of hospital wastewater by solar/TiO2/Fe2+/H2O2 process

2014 ◽  
Vol 49 (3) ◽  
pp. 223-233 ◽  
Author(s):  
S. Adish Kumar ◽  
G. S. Sree lekshmi ◽  
J. Rajesh Banu ◽  
I. Tae Yeom
Keyword(s):  
Suspended Solids ◽  
Synergetic Effect ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Process Efficiency ◽  
Hospital Wastewater ◽  
Optimal Conditions ◽  
Cost Of Treatment ◽  
Synergistic Degradation ◽  
The Cost

Combined heterogeneous and homogenous photo-catalytic degradation of hospital wastewater was investigated. Three processes – solar/TiO2/H2O2, solar/Fe2+/H2O2 and solar/TiO2/Fe2+/H2O2 – were evaluated. The solar/TiO2/Fe2+/H2O2 process displayed increased efficiency due to the synergetic effect of homogeneous and heterogeneous photo-catalytic reaction. The combination increased the photo process efficiency by decreasing the reaction time of the separate operations and decreased the cost of treatment. The optimal conditions enabling over 99% reduction of chemical oxygen demand (COD) were pH 7, 0.5 g/L Fe2+, 0.2 g/L TiO2 and 1.35 g/L H2O2. The effluent COD and total suspended solids concentrations were 20 and 30 mg/L, respectively, which met the discharge standard requirements.

scholarly journals Systematic Modeling of Municipal Wastewater Activated Sludge Process and Treatment Plant Capacity Analysis Using GPS-X

2020 ◽  
Vol 12 (19) ◽  
pp. 8182
Author(s):  
Nuhu Dalhat Mu’azu ◽  
Omar Alagha ◽  
Ismail Anil
Keyword(s):  
Activated Sludge ◽  
Suspended Solids ◽  
Systematic Approach ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Plant Performance ◽  
Capacity Analysis ◽  
Activated Sludge Process ◽  
Effluent Quality

Mathematical modeling has become an indispensable tool for sustainable wastewater management, especially for the simulation of complex biochemical processes involved in the activated sludge process (ASP), which requires a substantial amount of data related to wastewater and sludge characteristics as well as process kinetics and stoichiometry. In this study, a systematic approach for calibration of the activated sludge model one (ASM1) model for a real municipal wastewater ASP was undertaken in GPS-X. The developed model was successfully validated while meeting the assumption of the model’s constant stoichiometry and kinetic coefficients for any plant influent compositions. The influences of vital ASP parameters on the treatment plant performance and capacity analysis for meeting local discharge limits were also investigated. Lower influent chemical oxygen demand in mgO2/L (COD) could inhibit effective nitrification and denitrification, while beyond 250 mgO2/L, there is a tendency for effluent quality to breach the regulatory limit. The plant performance can be satisfactory for handling even higher influent volumes up to 60,000 m3/d and organic loading when Total Suspended Solids/Volatile Suspended Solids (VSS/TSS) and particulate COD (XCOD)/VSS are maintained above 0.7 and 1, respectively. The wasted activated sludge (WAS) has more impact on the effluent quality compared to recycle activated sludge (RAS) with significant performance improvement when the WAS was increased from 3000 to 9000 m3/d. Hydraulic retention time (HRT) > 6 h and solids retention time (SRT) < 7 days resulted in better plant performance with the SRT having greater impact compared with HRT. The plant performance could be sustained for a quite appreciable range of COD/5-day Biochemical Oxygen Demand (BOD5 in mgO2/L) ratio, Mixed Liquor Suspended Solid (MLSS) of up to 6000 mg/L, and when BOD5/total nitrogen (TN) and COD/TN are comparatively at higher values. This work demonstrated a systematic approach for estimation of the wastewater treatment plant (WWTP) ASP parameters and the high modeling capabilities of ASM1 in GPS-X when respirometry tests data are lacking.

The Effects of Aluminum Sludge From Water Purification on Municipal Primary Sewage Treatment

1973 ◽  
Vol 8 (1) ◽  
pp. 122-147
Author(s):  
J. D. O’Blenis ◽  
T.R. Warriner
Keyword(s):  
Water Purification ◽  
Pilot Plant ◽  
Suspended Solids ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Phosphate Removal ◽  
Plant Performance ◽  
Alum Sludge

Abstract The current widespread practice of disposal of water filtration plant wastes by direct discharge to receiving waters is coming under critical review by regulatory agencies. Among the alternatives for management of these wastes is the possibility of disposal to sanitary sewer systems. Since a recent nation-wide survey had established alum sludge as the most common waste generated by filtration plants, research was initiated to study the effects of water plant alum sludge on primary sewage treatment. A pilot primary sewage treatment plant was constructed and operated with a raw sewage feed of five litres per minute. A laboratory jar test program was conducted to supplement pilot plant operation. Sludges from two different water purification plants were tested along with alum and combinations of alum and water purification plant sludge for their effects on the removal of suspended solids, chemical oxygen demand (COD) and phosphates. The data showed jar testing to be a good indicator of pilot plant performance. Suspended solids, COD and phosphate removal efficiencies were improved by the addition of the sludges. The phosphate removal capacity of water treatment plant alum sludge was approximately the same as that reported for aluminum hydroxide, or about 1/7 to 1/9 of that determined for alum (as Aluminum). Recycling of the sludges improved phosphate removal performance.

scholarly journals Qualidade de Água do Rio Cuiabá no Perímetro Urbano da Capital Mato-Grossense

UNICIÊNCIAS ◽  
2021 ◽  
Vol 24 (2) ◽  
pp. 158-164
Author(s):  
Jorge Luiz de Arruda ◽  
Ana Carolina Amorim Marques ◽  
Osvaldo Borges Pinto Junior
Keyword(s):  
Water Quality ◽  
Biochemical Oxygen Demand ◽  
Rainy Season ◽  
Quality Index ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Quality Parameters ◽  
Dry Period ◽  
Total Coliforms ◽  
Effluent Quality

Este trabalho apresenta uma análise do índice e dos parâmetros de qualidade de água no perímetro urbano do rio Cuiabá - MT, considerando uma variação temporal (período úmido e seco) e espacial (montante - jusante) no ano de 2015. Os resultados mostraram que maiores valores de turbidez, sólidos totais, oxigênio dissolvido, demanda bioquímica de oxigênio e coliformes totais foram obtidos no período úmido e que os maiores valores de pH, nitrogênio/nitrato e fósforo/fosfato ocorreram no período seco. O Índice de Qualidade de Água (IQA) foi maior no período seco em função de menores valores sólidos em suspensão, turbidez e coliformes totais. A análise da água da região perimetral ao rio Cuiabá demonstrou diferenças significativas entre os pontos mais a montante (Sucuri) em relação aos pontos a jusante (Porto e Caís) em ambos os períodos. Nesse sentido, o IQA foi menor nos pontos mais a jusante (Porto, Caís e Comunidade São Gonçalo Beira Rio) que nos pontos mais a montante (Sucuri e Ribeirão do Lipa). Os parâmetros estudados atendem a normatização da Resolução Conama 357/2005, apesar das diferenças no IQA para os pontos amostrados entre os períodos sazonais.   Palavras-chave: Efluente. Índice de Qualidade. Valoração Ambiental.   Abstract This work presents an analysis of the index and water quality parameters in the urban perimeter of  Cuiabá - MT, considering a temporal (rainy and dry period) and spatial (downstream) variation in the year 2015. Higher turbidity values, total dissolved oxygen, biochemical oxygen demand and total coliforms were obtained in the rainy season, while higher values ​​of pH, nitrogen / nitrate and phosphorus / phosphate occurred in the dry period.  IQA was higher in the dry period due to lower suspended solids, turbidity and total coliforms. The water analysis from the perimeter region to the Cuiabá river showed significant differences between the points upstream (Sucuri) in relation to the downstream points (Porto and Caís) in both periods. In this sense, the IQA was smaller in the points downstream (Porto, Caís and Comunidade São Gonçalo Beira Rio) than in the most upstream points (Sucuri and Ribeirao do Lipa). The studied parameters comply with the normalization of Conama Resolution 357/2005, despite the differences in the IQA for the points sampled between the seasonal periods.   Keywords: Effluent. Quality Index. Environmental Valuation.

scholarly journals Gardens Planted with Macrophytes Filters, Purification Performance in an Arid Climate – Pilot Station of Témacine, Ouargla (Algeria)

2013 ◽  
Vol 13 ◽  
pp. 259-268
Author(s):  
Hammadi Belkaçem ◽  
D. Bebba Ahmed Abdelhafid ◽  
Hacini Zineb ◽  
Zeghdi Saad
Keyword(s):  
Chemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Nitrate Pollution ◽  
Arid Climate ◽  
Phosphorus Pollution ◽  
Treated Water ◽  
Total Coliforms ◽  
Particulate Pollution ◽  
Very High

In this study, we are interested in evaluating the performance of a system for purifying wastewater by plants in an arid climate. The treated water is wastewater from domestic sources in the region of the old Ksar Temacine (Wilaya of Ouargla, South-East of Algeria). The results show good yields for organic and particulate pollution. Drawdown rate of approximately 97.49% of Suspended Solids (SS), 90.85% of Chemical Oxygen Demand (COD), have been achieved. The system effectively removes nitrate pollution 100% of ammonium and phosphorus pollution moderately 62.28% of orthophosphates. The system shows a very high removal of total coliforms (90%).

scholarly journals STUDY ON ADVANCED TREATMENT OF WASTEWATER BY ULTRA FILTRATION FOR REUSING PURPOSE – ON-SITE PILOTS

2020 ◽  
Vol 58 (5A) ◽  
pp. 160
Author(s):  
Tran Thuy Anh ◽  
Tran Duc Minh Hai ◽  
Nguyen Danh Tien ◽  
Tran Duc Ha
Keyword(s):  
Coal Mining ◽  
Suspended Solids ◽  
Reclaimed Water ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Ammonium Nitrogen ◽  
Advanced Treatment ◽  
Domestic Water ◽  
Ultra Filtration ◽  
Mining Wastewater

Reclaimed water has been greatly applied worldwide recently to augment water supply for non-potable domestic purpose. The present study put an effect on assessing the application of ultra-filtration (UF) on advanced treatment following conventional domestic wastewater treatment and coal mining wastewater for reusing purpose. On-site advanced treatment pilots using UF membrane with the capacity of 1 – 1.5 m3/h were built to treat decentralized domestic wastewater which has a low concentration of organic matters and coal mining wastewater which is abated by chemical-physical process and advanced treatment train. Dissolved oxygen (DO), pH, Chemical oxygen demand (COD), biochemical oxygen demand (BOD), total suspended solids (TSS), volatile suspended solids (VSS), Total Nitrogen (TN) and ammonium-nitrogen (NH4-N) in domestic wastewater and TSS, iron (Fe), manganese (Mn), and hardness of coal mining wastewater were analyzed. The pollutants in domestic wastewater were reduced significantly as of 82% TSS, 86% BOD5, 82% COD, and 96% NH4-N. The removal efficiency in coal mining wastewater reached 93.5% TSS, 67% iron, 68% manganese, and 52% hardness. The analyzed parameters in permeate of both pilots met legislation thresholds of Vietnam technical regulation on domestic water quality, proving that reclaimed water treated by UF can be used for non-potable domestic purposes.

Aeration and Water Hyacinths in Waste Stabilization Ponds

1987 ◽  
Vol 19 (12) ◽  
pp. 265-271
Author(s):  
P. R. Thomas ◽  
H. O. Phelps
Keyword(s):  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Substantial Improvement ◽  
Additional Treatment ◽  
Coliform Bacteria ◽  
Effluent Quality ◽  
Stabilization Ponds ◽  
Water Hyacinths

The investigation was based on two facultative stabilization ponds initially designed to operate in parallel, and now receive wastewater in excess of their capacities from a fast expanding housing estate in the Caribbean Island of Trinidad. Because of the deterioration of the effluent quality relative to acceptable standards, an attempt was made to upgrade the ponds using water hyacinths at the early stages. However, from the results, it was clear that the introduction of water hyacinths in the test pond did not lead to any substantial improvement in the effluent because of the high loading on the pond. Therefore the ponds were modified to operate in series with surface aerators installed in the first pond. Initially, the effluent quality was monitored in terms of total suspended solids, volatile suspended solids, biochemical oxygen demand, faecal coliform bacteria, pH and dissolved oxygen with aeration in the first pond and no aquatic plants in the second pond. Although there was a significant improvement in the effluent quality, the values remained above the standards. As a result, water hyacinths were introduced in the second pond and the effluent quality monitored together with aeration in the first pond. The effluent quality improved with total suspended solids and biochemical oxygen demand values both as low as 10 mg/l in certain months, but additional treatment was needed to reduce faecal conforms.

Management of Dairy Waste in the Sonoran Desert Using Constructed Wetland Technology

1999 ◽  
Vol 40 (3) ◽  
pp. 57-65 ◽  
Author(s):  
Martin M. Karpiscak ◽  
Robert J. Freitas ◽  
Charles P. Gerba ◽  
Luis R. Sanchez ◽  
Eylon Shamir
Keyword(s):  
Sonoran Desert ◽  
Suspended Solids ◽  
Waste Treatment ◽  
Oxygen Demand ◽  
Dairy Wastewater ◽  
Chemical Parameters ◽  
Treatment Facility ◽  
Physical Chemical ◽  
Scirpus Validus ◽  
Surface Wetland

An integrated wastewater treatment facility, consisting of upper (solids separators, anaerobic lagoons, and aerobic ponds) and lower (wetland cells) subsystems, has been built to replace the lagoon at a dairy in Arizona, USA. The collection sump of the new waste treatment facility collects all dairy wastewater outflow. Wastewater is then pumped to solids separators, and flows by gravity to anaerobic ponds and aerobic ponds. The upper subsystem is expected to treat the water sufficiently so that the wetland cells may achieve further pollutant reductions. The lower subsystem, comprised of 8 surface wetland cells with an approximate surface area of 5,000 m2, receives outflow from the ponds. The cells are planted with cattail (Typha domingensis), soft-stem bulrush (Scirpus validus), and reed (Phragmites australis). After treatment is completed via the lagoons and ponds followed by the wetland cells, the wastewater can be reused to flush barns or to irrigate crops. Performance of the overall system is evaluated by measuring physical, chemical and biological parameters in water samples taken from selected locations along the treatment system. Chemical parameters studied include biochemical oxygen demand, pH, total suspended solids, nitrogen species. Biological monitoring included coliforms (total and fecal) and Listeria monocytogenes.

Savings with upgraded performance through improved activated sludge denitrification in the combined activated sludge–biofilter system of the Southpest Wastewater Treatment Plant

2008 ◽  
Vol 57 (8) ◽  
pp. 1287-1293 ◽  
Author(s):  
A. Jobbágy ◽  
G. M. Tardy ◽  
Gy. Palkó ◽  
A. Benáková ◽  
O. Krhutková ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Biological Treatment ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Process Efficiency ◽  
Initial Value ◽  
Initial Profile ◽  
Biological Treatment System

The purpose of the experiments was to increase the rate of activated sludge denitrification in the combined biological treatment system of the Southpest Wastewater Treatment Plant in order to gain savings in cost and energy and improve process efficiency. Initial profile measurements revealed excess denitrification capacity of the preclarified wastewater. As a consequence, flow of nitrification filter effluent recirculated to the anoxic activated sludge basins was increased from 23,000 m3 d−1 to 42,288 m3 d−1 at an average preclarified influent flow of 64,843 m3 d−1, Both simulation studies and microbiological investigations suggested that activated sludge nitrification, achieved despite the low SRT (2–3 days), was initiated by the backseeding from the nitrification filters and facilitated by the decreased oxygen demand of the influent organics used for denitrification. With the improved activated sludge denitrification, methanol demand could be decreased to about half of the initial value. With the increased efficiency of the activated sludge pre-denitrification, plant effluent COD levels decreased from 40–70 mg l−1 to &lt; 30–45 mg l−1 due to the decreased likelihood of methanol overdosing in the denitrification filter

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