Analysis of the Potential of Crust Formation and Corrosiveness in the Way Rilau PDAM Lampung Distribution Network Using the Langelier Saturation Index Method

The Kedukan Bukit inscription was written in 682 AD. It is considered as the oldest inscription related to the kingdom of Srivijaya and an authentic proof of the advanced maritime culture of Srivijaya. This argument is supported by the fact that, geographically, Sumatra is endowed with hundreds of large and small rivers that have generated abundant natural resources from its upstream to downstream areas. Srivijaya must have utilized these natural conditions to facilitate the distribution of its trade commodities—pepper, camphor, resin, and gold—from the upstream regions (flowing through countless tributaries to the main rivers) to the coastal areas, and even further to the various ports in Southeast Asia. Archaeological methods were used to identify and analyze a number of findings in the form of ancient boat artifacts from Srvijaya period in terms of both their respective forms and positions as they were unearthed along the Batanghari and Musi watersheds, from the upstream to estuary areas. From these findings, it can be inferred that Srivijaya managed to build a pattern of distribution network of trade commodities and to develop a sophisticated boat technology to support it. The commodity distribution network started from the upstream areas, namely the feeder points, all the way down to the downstream areas, namely the collecting centers; then, the commodities would be transported to the estuary, namely the main port of Srivijaya, and then carried to various other ports throughout Southeast Asia. The development of boat technology is the second key to the success and effectiveness of the pattern of trade commodity distribution that Srivijaya created from its upstream to downstream areas. The combination of such distribution network pattern and the development of boat technology has successfully established Srivijaya’s image as the most influential maritime power in Southeast Asia in the ancient period.

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The influence of aeration on the change in corrosiveness and aggressiveness of groundwater

Water Science & Technology Water Supply ◽

10.2166/ws.2015.155 ◽

2015 ◽

Vol 16 (2) ◽

pp. 445-452 ◽

Cited By ~ 1

Author(s):

Tadeusz Siwiec ◽

Magdalena M. Michel ◽

Lidia Reczek ◽

Piotr Nowak

Keyword(s):

Carbon Dioxide ◽

Water Treatment ◽

Saturation Index ◽

Stability Index ◽

Water Layer ◽

Water Stability ◽

Air Bubbles ◽

High Concentration ◽

Aeration Time ◽

Langelier Saturation Index

A high concentration of aggressive carbon dioxide disturbs many technological processes in water treatment. It also causes the development of corrosion in steel and concrete. De-acidification of groundwater by means of air bubbles alters pH and the concentration of aggressive carbon dioxide. This was investigated for the variables of air flow (Q = 20–50 L h−1) and height of water layer (H = 25–75 cm) as well as aeration time (t = 0–20 min). The obtained three-parameter models showed good correlation with the experimental results, except in a few cases where r2 was bigger than 0.9. Furthermore, they allow for prediction of an increase of pH and a decrease in concentration of aggressive carbon dioxide in aerated water. The effectiveness of de-acidification of groundwater was evaluated using indices of water stability (Langelier Saturation Index, Precipitation Index, Ryznar Stability Index, Aggressiveness Index and Index of Aggressiveness). Although as a result of aeration an increase of pH over 7 was observed, the non-corrosive values of the indices were not reached. This was due to a very low alkalinity of water, which was 0.7 meq L−1.

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Influence of the degree of soil organic matter lability on the calcium carbonate equilibrium of soil water

Soil and Water Research ◽

10.17221/18/2009-swr ◽

2010 ◽

Vol 5 (No. 2) ◽

pp. 58-68

Author(s):

S. Kužel ◽

L. Kolář ◽

J. Gergel ◽

J. Peterka ◽

J. Borová-Batt

Keyword(s):

Organic Matter ◽

Calcium Carbonate ◽

Soil Water ◽

Saturation Index ◽

Farmyard Manure ◽

Hot Water ◽

Organic Matters ◽

Langelier Saturation Index ◽

The Stability ◽

Carbonate Equilibrium

: In average samples of three sandy-loamy acid Cambisols from a South Bohemian area labile organic matters were determined by the permangate method modified by the dichromate method, and the rate constant of their biochemical oxidation was determined in hot water extracts of the samples. The need of liming was determined by means of 2 methods. In soil solutions of these samples, all values necessary to evaluate their calcium carbonate equilibriums were determined. The soil samples were enriched with 3% of dry matter of two organic materials, farmyard manure and meadow clover meal, and were incubated at 25°C for 180 days under wetting above 50% of their retention water capacity, and after this procedure all analyses were repeated. Both methods were found to increase the need of liming in all three soils: the more labile the organic matter in 3% addition, the higher the need. The meadow clover matter was more labile than the farmyard manure matter. All three methods for the study of soil carbon lability yielded similar results while the potassium permanganate method was more sensitive than the dichromate one. Increases were observed in equilibrium [Cr(H2CO3* )] and in Langelier saturation index Is. This means that soil liming cannot be considered only as an adjustment to the soil acidity and supply of calcium to plants to meet their requirements, but also as a replacement of the spontaneous adjustment to calcium carbonate equilibrium of soil water, for which through mineralisation of labile organic matters in conditions of our experiment about 220 kg CaCO3 per hectare of land were consumed on condition that it was not necessary to re-establish it. The process of Ca-compound consumption to establish the calcium carbonate equilibrium is controlled exclusively by the degree of mineralising organic matters lability while the influence of soil properties is only marginal. The same results were provided by the comparison of calcium carbonate equilibriums in nine &Scaron;umava brooks of the total watershed area 78 564 km2 with the degree of lability of organic matters in their sediments in 1986, 2001 and 2004. A reduction in the intensity of agricultural production in 1986–2004 resulted in an increase in the stability of organic matters in the sediments, in a decrease in Is, and in a lower corrosivity of brooks water towards CaCO3. However, the quality of soils and their potential soil fertility decreased due to the loss of labile organic matters.

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Practice for Calculation and Adjustment of the Langelier Saturation Index for Reverse Osmosis

10.1520/d3739-94r98 ◽

1998 ◽

Author(s):

Keyword(s):

Reverse Osmosis ◽

Saturation Index ◽

Langelier Saturation Index

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ENTUPIMENTO DE GOTEJADORES CONVENCIONAIS POR PRECIPITADOS QUÍMICOS DE CARBONATO DE CÁLCIO E MAGNÉSIO, COM QUATRO ÍNDICES DE SATURAÇÃO DE LANGELIER

Irriga ◽

10.15809/irriga.2008v13n4p525-539 ◽

2008 ◽

Vol 13 (4) ◽

pp. 525-539 ◽

Cited By ~ 1

Author(s):

Ralini Ferreira de Mélo ◽

Rubens Duarte Coelho ◽

Marconi Batista Teixeira

Keyword(s):

Water Distribution ◽

Saturation Index ◽

Operating Time ◽

Test Conditions ◽

Terra Preta ◽

Langelier Saturation Index ◽

Distribution Uniformity ◽

Calcium And Magnesium ◽

Saturation Indexes ◽

Bench Testing

ENTUPIMENTO DE GOTEJADORES CONVENCIONAIS POR PRECIPITADOS QUÍMICOS DE CARBONATO DE CÁLCIO E MAGNÉSIO, COM QUATRO ÍNDICES DE SATURAÇÃO DE LANGELIER Ralini Ferreira de Mélo1; Rubens Duarte Coelho2; Marconi Batista Teixeira21Escola Agrotécnica Federal de Vitória de Santo Antão, Propriedade Terra Preta, Vitória de Santo Antão, PE, [email protected] de Engenharia Rural, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Piracicaba, SP 1 RESUMO Com o objetivo de avaliar a influência da indução forçada de precipitados químicos à base de carbonatos de cálcio e magnésio no coeficiente de variação e uniformidade de distribuição de água, foi realizado um ensaio no Laboratório de Irrigação da ESALQ/USP, utilizando-se quatro índices de saturação de Langelier (ISL): ISL -2,268; ISL 0,469; ISL 1,156 e ISL 1,439. Em cada ensaio com um determinado ISL, foram utilizados oito tipos de gotejadores convencionais, instalados em uma bancada com11 mde comprimento. As obstruções observadas nos gotejadores, tanto parciais como totais decorrentes do tempo de funcionamento, resultaram em aumento do coeficiente de variação e redução drástica da uniformidade de distribuição de água. Para as condições de ensaio realizado, observou-se que o índice de saturação de Langelier não deve ser usado como único parâmetro para prever a obstrução dos gotejadores. UNITERMOS: irrigação localizada, cálcio e magnésio, Índice de Saturação de Langelier. MÉLO, R. F. de; COELHO, R. D.; TEIXEIRA, M. B. CLOGGING OF A COMMERCIAL DRIPPERS BY CALCIUM AND MAGNESIUM PRECIPITATES USING FOUR LANGELIER SATURARION INDEXES 2 ABSTRACT An essay was carried out in the laboratory of irrigation at ESALQ/USP to evaluate the effect of calcium and magnesium precipitates on the variation and uniformity coefficients in irrigation drippers. Four Langelier saturation indexes (LSI) (-2,268; 0,469; 1,156; 1,439) and eight commercial drippers were used. They were installed on an 11m bench testing apparatus. Both partial and total obstructions of the drippers were observed over the operating time increasing the variation coefficient and reducing the water distribution uniformity. Within the test conditions, LSI should not be used as a single parameter to estimate dripper clogging. KEY WORDS: drip irrigation, calcium and magnesium, Langelier saturation index

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Tingkat Korosivitas Air Terhadap Infrastruktur Sumber Daya Air Berbahan Semen atau Mortar dengan fc’ ≤ 30 MPa pada 9 Waduk di Indonesia

Jurnal Teknik Kimia Indonesia ◽

10.5614/jtki.2020.19.1.4 ◽

2021 ◽

Vol 19 (1) ◽

pp. 20

Author(s):

Devita Satya Lestari

Keyword(s):

Water Quality ◽

Compressive Strength ◽

Water Resources ◽

Standard Method ◽

Saturation Index ◽

National Standard ◽

Primary Data ◽

Method Of Calculation ◽

Langelier Saturation Index ◽

Index Saturation

Abstrak. Korosi atau kerusakan yang terjadi di infrastruktur sumber daya air terutama yang berbahan semen atau mortar dengan fc’ atau dengan nilai kuat tekan ≤ 30 Mpa, dapat menimbulkan banyak kerugian. Kerugian yang ditimbulkan antara lain kerugian secara materiil karena korosi menggerogoti semua aset infrastruktur dan tentunya kerugian dalam hal keamanan karena dapat mengancam keselamatan manusia. Korosi merupakan permasalahan yang sangat penting dan tidak akan ada habisnya, karena peristiwa korosi terjadi secara terus-menerus dan berkelanjutan. Peristiwa korosi tidak dapat terjadi dengan sendirinya, tetapi karena adanya berbagai faktor-faktor tertentu yang dapat menyebabkan terjadinya korosi. Tujuan dari studi ini adalah untuk menentukan tingkat korosivitas air terhadap infrastruktur sumber daya air berbahan semen atau mortar dengan fc’ atau dengan nilai kuat tekan ≤ 30 MPa pada 9 waduk di Indonesia, sehingga akan diketahui rekomendasi yang tepat untuk pencegahan dan pengendalian korosivitas air terhadap infrastruktur sumber daya air berbahan semen atau mortar dengan fc’ atau dengan nilai kuat tekan ≤ 30 MPa, karena semen merupakan salah satu material yang paling banyak digunakan saat ini. Studi ini menggunakan data-data primer kualitas air. Metode pengambilan, penyimpanan, dan pengawetan sampel air dilakukan dengan mengikuti ketentuan dari Standar Nasional Indonesia Nomor 6989.57:2008. Pengujian kualitas air dilakukan oleh laboratorium yang terakreditasi. Metode perhitungan menggunakan rumus Langelier Saturation Index (LSI) A, B, C, D, dan rumus Saturation Index (SI) dari Standard Method APHA-AWWA-WEF. Hasil perhitungan LSI A, B, C, D, dan SI Standard Method APHA-AWWA-WEF menunjukkan bahwa tingkat korosivitas air di 9 waduk berpotensi menyebabkan korosi terhadap infrastruktur sumber daya air berbahan semen atau mortar dengan fc’ atau dengan nilai kuat tekan ≤ 30MPa. Kata kunci: infrastruktur sumber daya air, Langelier Saturation Index, Saturation Index, tingkat korosivitas air. Abstract. Water Corrosivity Level Againts the Water Resources Infrastructure Made of Cement or Mortar with fc' ≤ 30 MPa in 9 Reservoirs in Indonesia. Corrosion or damage that occurs in the infrastructure of water resources, especially those made of cement or mortar with fc' or with a compressive strength value of ≤ 30 MPa will be able to engender losses. Losses incurred, in the form of losses materially because of corrosion gnaw off all infrastructure assets and of course in losses terms of security, because it can threaten the safety of a human. Corrosion is a very important problem and will not be endless, as corrosion events occur continuously and sustainably. Corrosion events cannot occur by themselves, but because of certain factors that may cause corrosion. The purpose of this study is to determine the level of water corrosivity to the infrastructure of water resources made from cement or mortar with fc' or with a compressive strength value of ≤ 30 MPa in 9 reservoirs in Indonesia, to develop appropriate recommendations for the prevention and control of the water corrosivity to the infrastructure of water resources made from cement or mortar with fc' or with a compressive strength value of ≤ 30 MPa because cement is one of the most used materials today. This study uses water quality primary data. The methods of capturing, storing, and preserving water samples are carried out following the provisions of Indonesian national standard number 6989.57:2008. Water quality testing is done by accredited laboratories. The method of calculation uses the Langelier Saturation Index (LSI) A, B, C, D, and the formula Saturation Index (SI) of the Standard Method APHA-AWWA-WEF. Calculation results of LSI A, B, C, D, and SI Standard Method APHA-AWWA-WEF show that the level of water corrosivity in 9 reservoirs has the potential to cause corrosion of water resources infrastructure made of cement or mortar with fc' or with a compressive strength value of ≤ 30 MPa. Keywords: Langelier Saturation Index, Saturation Index, water corrosivity level, water resource infrastructure.

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Calcium Carbonate Scale Formation, Prediction and Treatment (Case Study Gumry Oilfield-PDOC)

International Letters of Chemistry Physics and Astronomy ◽

10.18052/www.scipress.com/ilcpa.17.47 ◽

2013 ◽

Vol 17 ◽

pp. 47-58 ◽

Cited By ~ 2

Author(s):

A. Saifelnasr ◽

M. Bakheit ◽

K. Kamal ◽

A. Lila

Keyword(s):

Calcium Carbonate ◽

Produced Water ◽

Saturation Index ◽

Water Injection ◽

Stability Index ◽

Scale Formation ◽

Injection Process ◽

Langelier Saturation Index ◽

Calcium Carbonate Scale

In this study the predictions and probabilities of calcium carbonate scale formation and corrosion occurrence inside Gumry Field Process Facilities (GFPF) and produced water injection process units (PWTP) was carried out. This was done calculating the Langelier Saturation Index (LSI), Ryznar Stability Index (RSI), Puckorius Scaling Index (PSI). The samples results for LSI index and PSI index were compared and found that all samples under threaten of calcium carbonate scale. The samples results for RSI index and found that all samples under formation of heavy calcium carbonate scale. Special excel computer program was designed to calculate the (LSI, RSI, PSI). The scale was cleaned and removed by 10% diluted hydrochloric acid and commercial scale inhibitor.

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Assessment of Water Quality of Khari River in Agra District During Lockdown Period using Multivariant Techniques and Quality Indexes

Asian Journal of Chemistry ◽

10.14233/ajchem.2022.23411 ◽

2021 ◽

Vol 34 (1) ◽

pp. 67-77

Author(s):

R.K. Saraswat ◽

S. Verghesep ◽

T. Pachauri

Keyword(s):

Water Quality ◽

Positive Impact ◽

Anthropogenic Activities ◽

Saturation Index ◽

Principal Component ◽

Comparative Assessment ◽

Langelier Saturation Index ◽

Industrial Use ◽

Quality Indexes

Throughout the world, the lock-down period during COVID-19 (March 2020- July 2021) has reported an improvement in the ecological scenario with controlled anthropogenic activities. This study presents a comparative assessment of water quality of the highly polluted Khari river in Agra district (India) during the pre-pandemic and post-pandemic period of COVID-19. The result was analyzed in terms of water quality index (WQI), the most accessed tool used by various researchers to report the water quality. In addition, Aggressive index (AI) and Langelier saturation index (LSI) have also been determined. Further, multivariate analysis has been performed in terms of principal component analysis (PCA). ANOVA has been used to study the variance of the parameters. The study revealed a positive impact of pandemic on the water quality as the parameters improved during the post-pandemic period as compared to the pre-pandemic period. However, as the river was highly polluted during the pre-pandemic period, strict actions are required for further improvement in its water quality for agricultural, industrial and industrial use.

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Develop an integrating coagulation and RO systems to treat highly turbid water using synthesized coagulants

Water Science & Technology ◽

10.2166/wst.2022.001 ◽

2022 ◽

Author(s):

Yogendra Singh Solanki ◽

Madhu Agarwal ◽

A. B. Gupta

Keyword(s):

Saturation Index ◽

Stability Index ◽

Turbid Water ◽

Permeate Flux ◽

Treated Water ◽

Feed Pressure ◽

Coagulation Performance ◽

Langelier Saturation Index ◽

Ro Membrane ◽

Ph Range

Abstract In the present study coagulation process was used as pretreatment for the RO membrane with turbid raw water collected from Bisalpur Dam, Rajasthan, India. To optimize coagulation performance, three kinds of coagulants, namely, Alum (commercially available), synthesized inorganic polymeric coagulant-medium basicity (IPC-M), and inorganic polymeric coagulant-ultra high basicity (IPC-UH) were examined for turbidity removal with varying operating parameters. It was observed that in the optimum pH range of 6–7, the IPC-UH resulted as the best performing coagulant with 0.99 mg/L equivalent Al2O3 dose revealing 2 NTU residual turbidity and residual aluminium of 0.001 mg/L. Moreover, Langelier saturation index and Ryznar stability index values were evaluated at optimum conditions of all the three coagulants proclaiming negligible scaling potential. Furthermore, the coagulant-treated water (100 L) was fed to the RO membrane, and the performance was noted in terms of flux, pressure, and TDS. It was observed that IPC-UH has the lowest reduction in permeate flux of 0.78 L/min/m2 compared to commercially available coagulant alum (0.90 L/min/m2). Also, the increased feed pressure was observed for all the coagulants treated water with the lowest value of 2.3 kg/cm2 for IPC-UH, which was 2.5 kg/cm2 for Alum (commercially available coagulant). Henceforth, integration of coagulation before the RO system resulted in effective pretreatment of turbid water with very minute scaling.

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Water quality assessment of a tropical river using water quality index (WQI), multivariate statistical techniques and GIS

Applied Water Science ◽

10.1007/s13201-019-1045-2 ◽

2019 ◽

Vol 9 (7) ◽

Cited By ~ 8

Author(s):

Sanjoy Shil ◽

Umesh Kumar Singh ◽

Pankaj Mehta

Keyword(s):

Water Quality ◽

Water Quality Index ◽

Quality Index ◽

Monsoon Season ◽

Saturation Index ◽

Stability Index ◽

Water Quality Assessment ◽

Multivariate Statistical ◽

Two Samples ◽

Langelier Saturation Index

Abstract Mahananda River is an important river in India and Bangladesh, as the people of both the countries use the water extensively, without sufficient and reliable information about water qualities and pollution status. The purpose of this study is to evaluate the water quality of the river and to analyse the suitability for drinking, agricultural and industrial uses. This is why this study on the Mahananda River is extremely important for the region. For this study, samples from fourteen sampling stations were collected in pre-monsoon and post-monsoon seasons in 2016 and water quality index (WQI), agriculture and industry-related indices were computed. WQI values designated two sampling stations out of fourteen sampling stations as ‘very bad’ category and another two sampling stations as ‘bad’ category. The pH values of some sampling stations slightly exceeded the upper permissible limit. USSL diagram analysis classified two samples of pre-monsoon season in C2S1 category which indicates a medium salinity and low sodium water. Magnesium hazard values of four sampling stations are above 50% suggesting not suitable for irrigation. However, some indices like sodium per cent, residual sodium carbonate and residual sodium bicarbonate, Kelly’s index, permeability index and potential salinity allow the water for use in irrigation purposes. Langelier Saturation Index and aggressive index values designate the water as moderately aggressive or non-aggressive. Ryznar Stability Index values designate the water as ‘aggressive’ or ‘very aggressive’ indicating unsuitability for industrial uses. Sampling stations S-1, S-2, S-8 and S-14 need special attention.

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