Fulvic Acid Removal by Aluminum Salts in the Presence and Absence of a Nonionic Polymer

1985 ◽  
Vol 20 (1) ◽  
pp. 54-66
Author(s):  
Diamadopoulos Evangelos ◽  
Donald R. Woods
Keyword(s):  
Fulvic Acid ◽  
Aluminum Chloride ◽  
Colloidal Particles ◽  
Aluminum Sulfate ◽  
Test Procedures ◽  
Aluminum Salts ◽  
Jar Test ◽  
Nonionic Polymer ◽  
Presence And Absence

Abstract The removal of fulvic acid by means of aluminum salts and a nonionic polymer (nonionic polyacrylamide) was investigated in accordance with jar test procedures. Both aluminum chloride and aluminum sulfate demonstrated similar efficiencies in removing fulvic acid from water. Removals after nitration were highest at the lowest pH studied (pH ~ 6) and depending on the aluminum dose, removals up to 10')% were observed. The settleability of the flocs, however, was very poor. Only for the highest Al done employed (0 5 v 10-3M) and for the AlCl3 case, removals higher than 80 percent after 20 minutes of settling were observed. The presence of the polymer enhanced both the settleability of the flocs and the removals after filtration. The latter was attributed to the flocculation of the micro-colloidal particles that passed through the pores of the filter in the absence of the polymer.

scholarly journals A bioassay of the toxic effects of aluminum chloride and aluminum sulfate using Auloforus (Dero furcata)

2021 ◽  
Vol 937 (2) ◽  
pp. 022021
Author(s):  
I Ivanova ◽  
A Popov ◽  
A Chukhno ◽  
S Kovalkova
Keyword(s):  
Aluminum Chloride ◽  
Aluminum Sulfate ◽  
Clinical Manifestations ◽  
Indicator System ◽  
Toxic Effects ◽  
Aluminum Salts ◽  
Aluminum Cation ◽  
Results Of Biotesting ◽  
Toxic Concentrations ◽  
Chloride Salts

Abstract The analysis of the toxicity of aluminum salts is determined by the fact that aluminum cation is contained in drinking water, artificial dyes and additives, medicines, vaccines, aerosols, and there is also a correlation between the concentration of aluminum ion in brain tissues and clinical manifestations of Alzheimer’s disease. The article presents the results of biotesting the toxic effects of aluminum chloride and sulfate using Aulophorus (Dero furcata). Currently, the methods of bioassay do not have a generally recognized and standardized system of biological analysis, there are no unambiguous requirements that an indicator system should meet. These worms are a biotest object, because its reaction to the environment can be traced by its creation of conglomerates. The behavior of Auloforus in the experiment depends on the concentration, the time spent in aluminum solutions, as well as on the specific salt. When comparing the dynamics of the behavior of Auloforus in experimental samples of aluminum solutions, we established toxic concentrations. It was found that aluminum chloride salts have a less toxic effect than aluminum sulfate.

Effects of pre-treatment with magnetic ion exchange resins on coagulation/flocculation process

2008 ◽  
Vol 57 (1) ◽  
pp. 57-64 ◽  
Author(s):  
B. Sani ◽  
E. Basile ◽  
C. Lubello ◽  
L. Rossi
Keyword(s):  
Ion Exchange ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Ion Exchange Resin ◽  
Test Procedures ◽  
Aggregation State ◽  
Jar Test ◽  
Pre Treatment ◽  
Magnetic Ion

A new Magnetic Ion EXchange resin for DOC (Dissolved Organic Carbon) removal (MIEX®DOC Resin) has been evaluated as water pre-treatment at the Drinking Water Treatment Plant (DWTP) of Florence in order to reduce the oxidant demand and disinfection by-products (DBPs) formation potential. This pre-treatment leads to several effects on downstream treatment processes. In this experimental study the effects of MIEX® pre-treatment on clariflocculation process were evaluated with respect to coagulant demand reduction and characteristics of flocs formed. The analysis was conducted using traditional jar test procedures and a Photometric Dispersion Analyser (PDA2000) which provided continuous information about the aggregation state of particles during the jar tests. For a fixed turbidity goal in clarified water, ion exchange pre-treatment led to coagulant dosage reduction up to 60% and PDA results shown that flocs formed in pre-treated water were bigger and more resistant to shearing effects than those formed by conventional clariflocculation.

Optimum Tests for Comparison of two Inverse Guassian Shape Parameters

1988 ◽  
Vol 37 (3-4) ◽  
pp. 233-236
Author(s):  
A. Parsian ◽  
N. Sanjari Farsipour
Keyword(s):  
Nuisance Parameters ◽  
Inverse Gaussian ◽  
Shape Parameters ◽  
Test Procedures ◽  
Gaussian Distributions ◽  
Presence And Absence ◽  
Sample Case

In this article we consider the two sample case to eompare shape parameters of two Inverse Gaussian distributions. Optimum test procedures for both one­sides and two­sides cases are derived, in the presence and absence of the nuisance parameters.

scholarly journals Coagulation in Treatment of Swine Slaughterhouse Wastewater

2017 ◽  
Vol 63 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Bui Manh Ha ◽  
Duong Thi Giang Huong
Keyword(s):  
Ferrous Sulfate ◽  
Aluminum Sulfate ◽  
Test System ◽  
Ho Chi Minh City ◽  
Treatment Efficiency ◽  
Slaughterhouse Wastewater ◽  
Jar Test ◽  
Coagulant Dosage ◽  
Pre Treatment ◽  
The One

Abstract In this study, wastewater taken from the Nam Phong swine slaughterhouse, Ho Chi Minh City, was used to evaluate the treatment efficiency of common coagulants, including Alum (Aluminum Sulfate - Al2(SO4)3.18H2O), Poly-Aluminum Chloride (PAC), and Ferrous Sulfate (FeSO4.7H2O), using a jar-test system. The experiments were conducted using the one-factor-at-a-time method to examine three variables which are pH, stirring speed, and coagulant dosage. The results showed that both Alum and PAC perform over 90% removal of colour, turbidity, COD, and total phosphorus (TP) from slaughterhouse wastewater at pH 7 with a stirring speed of 75 revolutions per minute (RPM) and average coagulant dosages of 450 mg/L for Alum and 550 mg/L for PAC. Meanwhile, under the appropriate conditions of pH equal to 10 and 75 RPM with a chemical dosage of 350 mg/L, COD and TP removal efficiencies by Ferrous Sulfate exceed 87%, but those of turbidity and colour only reach 25%. This finding could be a promising coagulation method as a pre-treatment for the swine slaughterhouse wastewater.

scholarly journals USE OF MODIFIED REAGENTS SOLUTIONS WHEN PREPARING DRINKING WATER

2021 ◽  
Vol 6 (166) ◽  
pp. 141-145
Author(s):  
S. Dushkin ◽  
T. Shevchenko ◽  
O. Galkina
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Suspended Solids ◽  
Aluminum Sulfate ◽  
Technology Development ◽  
Environmental Safety ◽  
Aluminum Salts ◽  
The Cost ◽  
Clarified Water

Currently, attention is paid to the intensification of the process of natural and wastewater treatment, improvement of technology, development of new effective methods of intensification of water treatment. This will simplify the existing technology of water treatment, reduce labor-intensive processes of preparation and dosing of reagents, reduce the cost of operating treatment plants, increase their productivity, improve quality and reduce the cost of treated water. Treatment of water with a modified coagulant solution allows to increase the hydraulic size of the coagulated suspension. The strongest effect of the modified coagulant solution has on the hydraulic suspension size of 0.2 mm/s and less, i.e. the smallest and the suspension, which is difficult to remove, which creates conditions for more intensive sedimentation in settling tanks and improve the quality of water clarification and fed to fast filters. It has been experimentally determined that the treatment of water with a modified solution of aluminum sulfate coagulant should be performed when the content of suspended solids in the clarified water is up to 100–150 mg / dm3. The color of the clarified water during treatment with a modified solution of aluminum sulfate coagulant does not depend on the content of suspended solids and is 1.5-1.6 times lower than the color than when using a conventional coagulant solution. It is established that the use of a modified solution of aluminum sulfate coagulant in water purification can reduce the residual aluminum content in clarified water by an average of 50-60%. The results of researches of the modified solutions of reagents which are used at preparation of drinking water are presented. It is established that water treatment with a modified solution of aluminum sulfate coagulant allows to improve the quality of drinking water preparation by suspended solids, color, reduce the content of aluminum salts in the clarified water, thereby increasing the environmental safety of drinking water.

scholarly journals Studi proses koagulasi air baku untuk air bersih di wilayah bencana pasca tsunami kabupaten aceh besar

2018 ◽  
Vol 8 (1) ◽  
pp. 12
Author(s):  
Ignasius D.A. Sutapa
Keyword(s):  
River Water ◽  
Aluminum Sulfate ◽  
Potable Water ◽  
Sampling Interval ◽  
Optimum Dose ◽  
Raw Water ◽  
Tsunami Disaster ◽  
Jar Test ◽  
Sedimentation Time

Study on raw water coagulation process for potable water production in the post-tsunami disaster areas district aceh besarThe coagulation – flocculation process in potable water treatment is very important to be studied in greater detail, since it has a very major impact on subsequent water purification processes and the quality of the water product. Types of coagulant that are commonly used are aluminum sulfate (alum) and poly-aluminum chloride (PAC). The objective of this research was to determine the optimum coagulant type and concentration to be applied for the treatment of surface water in post-tsunami disaster areas. This research is urgently required to design clean water installation in such area. Jar test of coagulants was performed to measure the efficiency of coagulation and sampling interval. From the obtained results, it can be concluded that the raw water turbidity influences the sedimentation time. At turbidity below 15 NTU, the optimum sedimentation time was 5 minutes. At turbidities above 15 NTU, the sedimentation was quicker, namely 1 minute. Based on jar test results on Krueng Raya river water, it can be observed that this river water can be treated with aluminum sulfate coagulant at 20 ppm dose. When PAC coagulant was used, the optimum dose was 15 ppm.Keyword: coagulant, efficiency, coagulation, water quality.AbstrakProses koagulasi flokulasi dalam pengolahan air minum sangat penting untuk ditinjau lebih jauh karena mempunyai pengaruh yang sangat besar terhadap proses purifikasi air berikutnya dan kualitas air produksi. Jenis koagulan yang sering dipakai adalah alumunium sulfat (alum) dan poly alumunium chloride (PAC). Tujuan penelitian ini adalah untuk menentukan tipe dan konsentrasi optimal koagulan yang diaplikasikan pada air baku berupa air permukaan di wilayah bencana pasca tsunami. Hal ini sangat diperlukan untuk membuat perencanaan rancangan instalasi pengolahan air bersih di wilayah tersebut. Jar test koagulan dilakukan untuk menentukan efisiensi koagulasi dan waktu sampling. Dari hasil penelitian ini dapat disimpulkan kekeruhan air baku mempengaruhi waktu sedimentasi. Pada kekeruhan di bawah 15 Nephelometric Turbidity Unit (NTU), waktu optimum sedimentasi adalah lima menit, tetapi pada air baku yang kekeruhannya di atas 15 NTU, waktu sedimentasi lebih cepat yaitu satu menit saja. Dari hasil jar tes yang dilakukan terhadap air di sungai Krueng Raya dapat dilihat bahwa air sungai Krueng Raya dapat diolah dengan bahan koagulan aluminium sulfat pada dosis 20 ppm, sedangkan jika menggunakan bahan koagulan PAC memerlukan dosis optimal 15 ppm.Kata kunci : koagulan, efisiensi, koagulasi, kualitas air

scholarly journals Aloe vera as a natural flocculant for palm oil mill effluent (POME) treatment - characterisation and optimisation studies

2021 ◽  
Vol 1195 (1) ◽  
pp. 012035
Author(s):  
R L Chu ◽  
S Vasanthi ◽  
S Anurita
Keyword(s):  
Colloidal Particles ◽  
Aloe Vera ◽  
Oxygen Demand ◽  
Maximum Error ◽  
Active Components ◽  
Jar Test ◽  
Coagulant Dosage ◽  
Palm Oil Mill ◽  
Experimental Values ◽  
Central Composite

Abstract In the present study, fenugreek and aloe vera were investigated for the removal of turbidity (TUR), total suspended solids (TSS) and chemical oxygen demand (COD) from POME by using a central composite design (CCD) in the Design Expert software. The effects of three factors such as pH, coagulant dosage and flocculant dosage were analysed using jar test experiment and optimised using response surface methodology (RSM). The optimum results obtained from process optimisation analysis were pH 4, 24.13 g of coagulant dosage and 20 ml of flocculant dosage that are sufficient to remove 82.78 % of TUR, 83.40 % of TSS and 32.95 % of COD. The maximum error between the optimised values and the experimental values (82.78 % for TUR, 83.08 % for TSS and 33.76 % for COD) were below 4 %, indicating that satisfactory agreement was achieved. This showed that modelling and optimisation of the coagulation-flocculation process can be achieved by RSM approach. From analytical studies, it was found that the interactions between coagulant-flocculant and colloidal particles involve the mechanisms of charge neutralisation, adsorption and bridging, due to the active components such as amine (N-H) and hydroxyl (O-H) groups contained in the fenugreek and aloe vera.

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