Wastewater control in welding electrode manufacturing - a case study

2000 ◽  
Vol 42 (3-4) ◽  
pp. 309-313 ◽  
Author(s):  
O. Tünay ◽  
I. Kabdasli ◽  
D. Orhon
Keyword(s):  
Organic Matter ◽  
Suspended Solids ◽  
Chemical Oxidation ◽  
Surface Cleaning ◽  
High Concentration ◽  
Case Evaluation ◽  
Acid Bath ◽  
Separate Treatment ◽  
Welding Electrode

Metal finishing plants, although the wastewaters and treatment schemes for this category are well defined, require a case by case evaluation to find appropriate solutions and to solve specific problems. In this paper, a case study conducted on a welding electrode plant is presented. The wastewater sources were surface cleaning, copper plating and soap solutions used for drawing which were frequently included in waters. The plant was subjected to pretreatment standards, which necessitated the control of sulfate and organic matter in addition to standard parameters of metals, oil, suspended solids etc. Following a source-based characterization, treatability studies were conducted to treat high concentration of sulfate, organic matter as well as heavy metals and oil-grease. The proposed treatment scheme involved separate treatment of copper bath for recovery, chemical oxidation for soap solutions, sulfate precipitation for sulfuric acid bath and application of hydroxide precipitation to proper combination of other wastewater sources.

Degradation of wine industry wastewaters by photocatalytic advanced oxidation

2005 ◽  
Vol 51 (1) ◽  
pp. 113-120 ◽  
Author(s):  
P. Navarro ◽  
J. Sarasa ◽  
D. Sierra ◽  
S. Esteban ◽  
J.L. Ovelleiro
Keyword(s):  
Titanium Dioxide ◽  
Organic Matter ◽  
Heterogeneous Catalysts ◽  
Suspended Solids ◽  
Advanced Oxidation ◽  
Wine Industry ◽  
Biological Processes ◽  
H2o2 Concentration ◽  
High Concentration ◽  
Promising Technology

Wine industry wastewaters contain a high concentration of organic biodegradable compounds as well as a great amount of suspended solids. These waters are difficult to treat by conventional biological processes because they are seasonal and a great flow variation exists. Photocatalytic advanced oxidation is a promising technology for waters containing high amounts of organic matter. In this study we firstly investigated the application of H2O2 as oxidant combined with light (artificial or natural) in order to reduce the organic matter in samples from wine industry effluents. Secondly, we studied its combination with heterogeneous catalysts: titanium dioxide and clays containing iron minerals. The addition of photocatalysts to the system reduces the required H2O2 concentration. Although the H2O2/TiO2 system produces higher efficiencies, the H2O2/clays system requires a H2O2 dosage between three and six times lower.

scholarly journals Influence of runoff of suspended solids on quality of surface water: Case study of the Szreniawa River

2019 ◽  
Vol 41 (1) ◽  
pp. 83-90
Author(s):  
Agnieszka Kowalczyk ◽  
Sylwester Smoroń ◽  
Marek Kopacz
Keyword(s):  
Suspended Solids ◽  
Colorimetric Method ◽  
Average Concentration ◽  
High Concentration ◽  
Upward Trend ◽  
Biogenic Components ◽  
Basin Area ◽  
Low Precipitation

Abstract Research was conducted in selected points of the Szreniawa River basin (area 712 km2) located in the Miechowska Upland and the Proszowice Plateau. In the years 2016–2017 water samples from the Szreniawa River were taken monthly and the concentration of suspended solids was determined by filtration. The concentration of biogenic components NO3-N, NH4-N and PO4-P was determined by a colorimetric method, using an automatic flow analyser. The average concentration of suspended solids ranged from 192 to 390 mg·dm−3 (with minimum values of 5–20 mg·dm−3 and maximum 837–3937 mg·dm−3) at individual points. There was an upward trend between the content of suspended solids and the concentration of biogenic components. An extremely high concentration of suspended solids happened during storm-like precipitation at the end of June 2017 and amounted to 3937.2 mg·dm−3. The concentration of biogenic components was also highest in this period and amounted to 2.50 mg·dm−3 of NO3-N, 0.49 mg·dm−3 of NH4-N and 1.18 mg·dm−3 of PO4-P. At low precipitation the concentration of suspended solids was also low (5.0 mg·dm−3). A similar pattern was observed for the concentration of biogenic components which was 0.39 mg·dm−3 of NO3-N, 0.17 mg·dm−3 of PO4-P and 0.08 mg·dm−3 of NH4-N.

scholarly journals Water Contamination in Petroleum Refinery Processes

2021 ◽  
pp. 267-275
Author(s):  
Ibrahim M. Abou El Lei ◽  
Khaled M. Mezughi ◽  
Nuri M. Triki
Keyword(s):  
Environmental Protection Agency ◽  
Suspended Solids ◽  
Petroleum Refinery ◽  
Production Capacity ◽  
Oxygen Demand ◽  
Petroleum Products ◽  
High Concentration ◽  
Standard Values ◽  
Petroleum Refineries

<p>This study was conducted to assessment the environmental impacts in petroleum refineries due to the different processes. The paper presents the data obtained during a case study was achieved in Tobruk petroleum refinery. The main petroleum products of the refinery represented by diesel, light naphtha, heavy naphtha and kerosene with maximum production capacity concerning 21,500 bbl/day. The results of the study revealed that the waste water affected by high concentration of hydrocarbons. The heavy metals are also determined and represented by V, Fe, Ni and Cu with low contents in crude oil. Also the pollutants parameters in the disposal water e.g. biochemical oxygen demand, chemical oxygen demand, total organic carbon, suspended solids, phenols, ammonia and sulphides are determined, and the results are compared with other refinery types. The concentration of these parameters are higher than the standard values that recommended by Environmental Protection Agency (EPA), at the same time these values are less if they are compared with the other refinery types.</p>

scholarly journals Design and Performance of an Innovative Hybrid Constructed Wetland for Sustainable Pig Slurry Treatment in Small Farms

2021 ◽  
Vol 8 ◽  
Author(s):  
Antonina Torrens ◽  
Montserrat Folch ◽  
Miquel Salgot
Keyword(s):  
Organic Matter ◽  
Phragmites Australis ◽  
Constructed Wetland ◽  
Suspended Solids ◽  
Land Application ◽  
Dual Function ◽  
Pig Slurry ◽  
Small Farms ◽  
High Concentration ◽  
Swine Slurry

Simple and suitable treatment of swine slurry from small farms is paramount especially in sensitive areas. This paper evaluates the viability of an innovative nature-based technology hybrid system (a Vertical Flow Constructed Wetland followed by a Horizontal Flow Constructed Wetland both planted with reeds – Phragmites australis) to treat swine slurry for further land application or discharge in water bodies with reduced nitrogen impact. Physicochemical parameters, bacterial indicators, surface deposits and biomass inside the filters were monitored. The hybrid configuration offered a dual function for simultaneous solid-liquid separation and biological treatment. Removal of organic matter and suspended solids was very high (&gt;80% for SS and &gt;75% for COD and BOD5) while the overall nitrogen load removal was 65%, due to the combined nitrification/denitrification processes, thus effectively reducing swine slurry nitrogen content. The influence of temperature and design and operational parameters on the treatment efficiency and the hydraulic behavior were also studied. The vertical constructed wetland achieved good hydraulic performance with no clogging problems, despite high pollutant loads. Some of the pollutants were retained and mineralized in the surface deposit layer, increasing around 20 cm each year. This organic biosolid layer improved filtration efficiency. The high ammonia contents interfered with the growth of Phragmites australis, while the high concentration of suspended solids and organic matter determine the operation and design to be implemented.

Study on the performance of an up-flow aerated biofilter (UAB) in municipal wastewater treatments

1994 ◽  
Vol 30 (11) ◽  
pp. 25-33 ◽  
Author(s):  
Yoshimasa Watanabe ◽  
Satoshi Okabe ◽  
Tomochika Arata ◽  
Yuji Haruta
Keyword(s):  
Organic Matter ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Unique Feature ◽  
Aeration Rate ◽  
Loading Rates ◽  
Hydraulic Loading ◽  
Running Cost ◽  
And Performance ◽  
Activated Sludge Systems

A comprehensive wastewater treatment system that accomplishes oxidation of organic matter, nitrification, and denitrification was developed, and its characteristics and performance were investigated. A municipal wastewater was treated by an up-flow aerated biofilter (UAB), in which biofilms were developed on stainless meshes installed horizontally. This UAB exhibited a great potential ability of oxidation of organic matter, SS stabilization, and nitrification due to a unique aeration mechanism giving high DO concentrations with relatively low aeration rates. Another unique feature of the UAB was that attached biofilms on stainless meshes physically filtered out and/or adsorbed suspended solids in the wastewater in addition to the biological oxidation of organic matter. A stable nitrification could be achieved at HRT=10 hours corresponding to a hydraulic loading of 86 L m−2 d−1 and at a ratio of aeration rate to wastewater flow rate (A/W) of 2, which is considerably low as compared to aeration rates of typical activated sludge systems. This UAB system also could handle relatively high hydraulic loading rates. The UAB used in this study still have enough space to install more stainless meshes so as to reduce hydraulic loading rates resulting in the reduction of HRT and aeration rate, which leads to improvement of the system performance as well as reduction of the running cost.

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