Comparative Study on Anti-Fouling Properties and Application of Two PVDF Blend Membranes in Wastewater Treatment

2012 ◽  
Vol 550-553 ◽  
pp. 2164-2169
Author(s):  
Jian Ping Huang ◽  
Yu Min Shao ◽  
Li Li Liu ◽  
Chun Yan Ma
Keyword(s):  
Wastewater Treatment ◽  
Comparative Study ◽  
Removal Efficiency ◽  
Membrane Module ◽  
Step Method ◽  
Removal Rates ◽  
Turbidity Removal ◽  
Blend Membranes ◽  
Membrane Modules ◽  
Better Than

The filtration experiments of two PVDF blending membranes were performed. The critical fluxes of PVDF/PMMA and PVDF/TPU blend membranes were measured by the flux-step method. Then tubular membrane module PVDF/PMMA and PVDF/TPU were used to treat alcohol wastewater. The anti-fouling properties of PVDF/TPU membrane module were better than those of PVDF/PMMA membrane module. The critical fluxes of PVDF/PMMA and PVDF/TPU membrane modules were 24 L/(m2∙h) and 22 L/(m2∙h), respectively. In the alcohol wastewater treatment, TMP and SJ of the tested membranes remained stable during this period and membrane module B was more stable than membrane module A. The CODCr removal rates of two membrane modules reached 48% and 58%, respectively. And the UV254removal rates were 18% and 19%, respectively. Both the turbidity removal efficiency were more than 97% and the average effluent values were below 0.10NTU.

Denitrification with ɛ-caprolactam by acclimated mixed culture and by pure culture of bacteria isolated from polyacrylonitrile fibre manufactured wastewater treatment system

2004 ◽  
Vol 49 (5-6) ◽  
pp. 341-354 ◽  
Author(s):  
C.M. Lee ◽  
C.C. Wang
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Complete Removal ◽  
Polyacrylonitrile Fibre ◽  
Treatment System ◽  
Synthetic Wastewater ◽  
Pure Strain ◽  
Wastewater Treatment System ◽  
Mixed Bacteria ◽  
Better Than

The aim of this study is to isolate denitrifying bacteria utilizing ɛ-caprolactam as the substrate, from a polyacrylonitrile fibre manufactured wastewater treatment system. The aim is also to compare the performance of PAN (polyacrylonitrile) mixed bacteria cultures acclimated to ɛ-caprolactam and isolated pure strain for treating different initial e-caprolactam concentrations from synthetic wastewater under anoxic conditions. The result showed that the PAN mixed bacteria cultures acclimated to e-caprolactam could utilize 1538.5 mg/l of ɛ-caprolactam as a substrate for denitrification. Sufficient time and about 2200 mg/l of nitrate were necessary for the complete ɛ-caprolactam removal. Paracoccus thiophilus was isolated from the polyacrylonitrile fibre manufactured wastewater treatment system and it could utilize 1722.5 mg/l of ɛ-caprolactam as a substrate for denitrification. About 3500 mg/l of nitrate was necessary for the complete removal of ɛ-caprolactam. When the initial ɛ-caprolactam concentration was below 784.3 mg/l, the removal efficiency of ɛ-caprolactam by Paracoccus thiophilus was better than that for the PAN mixed bacteria cultures. The growth of Paracoccus thiophilus was better. However, when the initial ɛ-caprolactam concentration was as high as 1445.8 mg/l, both the ɛ-caprolactam removal efficiency by Paracoccus thiophilus and Paracoccus thiophilus specific growth rate were similar to the PAN mixed bacteria cultures.

scholarly journals Investigating the working efficiency of natural wastewater treatment systems: A step towards sustainable systems

2021 ◽  
Author(s):  
Ramdas Pinninti ◽  
Venkatesh Kasi ◽  
Sankar Rao Landa ◽  
Maheswaran Rathinasamy ◽  
Chandramouli Sangamreddi ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Rural Areas ◽  
Urban Areas ◽  
Management Strategies ◽  
Natural Treatment Systems ◽  
Waste Stabilization ◽  
Natural Treatment ◽  
Working Efficiency ◽  
Better Than

Abstract Globally, wastewater is a vital resource and requires appropriate treatment management strategies. Wastewater has become a major source of irrigation in the peri-urban areas of developing nations. With the increasing amount of wastewater generation, there are several complications in using treatment systems in terms of installation, operation and maintenance, and size in developing countries. Recently, natural treatment systems are gaining popularity due to less cost and maintenance and have been preferred in peri-urban settings. In this study, the working efficiency of the natural systems was assessed from case studies from Vizianagaram, Andhra Pradesh, India. The nutrient (Phosphorous and Nitrogen content) and organic matter removal efficiency of four natural treatment systems (NTS) having different operation maintenance and loading rates were investigated. The study showed that natural treatment systems have good potential for peri-urban wastewater treatment. It was also observed that waste-stabilization based system perform better than those based on duckweed and hyacinth plants. Regularly maintained and operated systems show removal efficiency on the order of 80% for organic and nutrients and performed better than others. The study indicates that decentralized, adequately maintained Waste Stabilization Ponds (WSP) offer a viable, self-sustaining and eco-friendly alternative for wastewater treatment to supply irrigation water in rural areas.

scholarly journals Synthesis and Performance of PAFS Coagulant Derived from Aluminium Dross

2022 ◽  
Vol 30 (1) ◽  
pp. 547-563
Author(s):  
Shiyi Li ◽  
Shafreeza Sobri
Keyword(s):  
Wastewater Treatment ◽  
Sulfuric Acid ◽  
Removal Efficiency ◽  
Sulfuric Acid Concentration ◽  
Settling Time ◽  
Optimum Conditions ◽  
Turbidity Removal ◽  
Preparation Conditions ◽  
Water Ph ◽  
Aluminium Dross

Polymerised aluminium ferric sulphate (PAFS) was prepared from aluminium dross as a coagulant in wastewater treatment. The effects of leaching time, leaching temperature, and sulfuric acid concentrations on the turbidity removal of the wastewater were investigated, and the optimum conditions were determined using response surface methodology. The results showed that the optimum PAFS preparation conditions were at a leaching time of 60 minutes, a leaching temperature of 65°C, and a sulfuric acid concentration of 1 mol/L. Furthermore, experiments were performed to investigate the effect of coagulant dosages using the PAFS prepared under the optimum leaching conditions, settling time and initial pH of the wastewater on the turbidity removal efficiency. As a result, it was found that the optimum coagulation conditions for PAFS coagulants were at a settling time of 15 minutes, coagulant dosage of 0.5g, and raw water pH 8. Under these optimum conditions, the turbidity removal efficiency of the wastewater was 91.45%. The purpose of this study was to investigate the possibility of aluminium dross utilisation as a coagulant agent for wastewater treatment. Therefore, it can be concluded that PAFS prepared by leaching metal oxides from aluminium dross is an effective wastewater coagulant.

scholarly journals AVALIAÇÃO DA EFICIÊNCIA DE AGENTES COAGULANTES EM EFLUENTE DE FRIGORÍFICO

2020 ◽  
Vol 12 (1) ◽  
pp. 11-19
Author(s):  
Alexandre Teixeira Souza ◽  
Danielli Chagas
Keyword(s):  
Comparative Study ◽  
Removal Efficiency ◽  
Small Variation ◽  
Cod Removal ◽  
The Other ◽  
Anionic Polymer ◽  
Turbidity Removal ◽  
Natural Coagulant ◽  
Aluminum Sulphate ◽  
Vegetable Tannin

In the refrigeration industry, a large amount of water is used throughout processes, generating effluents that need treatment before release. The purpose of this work was to make a comparative study of three coagulants used in the treatment of effluents: Aluminum Polychloride (PAC), Aluminum Sulphate (Al2(SO4)3) and Vegetable Tannin, with the aid of a flocculant (Anionic Polymer) by analyzing COD removal efficiency and turbidity. Jar coagulation / flocculation tests were conducted to optimize the concentration of coagulants. It was found that the natural coagulant presented a small variation in the pH parameter, avoiding the use of chemicals for its correction. The results of turbidity removal percentages indicated a great potential for Tannin when compared to the other chemical coagulants.

Performance of Horizontal Subsurface Flow Constructed Wetland of Application of Oily Wastewater

2012 ◽  
Vol 253-255 ◽  
pp. 965-968
Author(s):  
Xu Yang ◽  
Xue Ping Zhang ◽  
Ji Fu Wang ◽  
Bao Jian Wang ◽  
Xin Qi Guo
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Constructed Wetland ◽  
Treatment Process ◽  
Mineral Oil ◽  
Horizontal Flow ◽  
Oily Wastewater ◽  
Removal Rates ◽  
Subsurface Flow Constructed Wetland ◽  
The Mean

In order to evaluate the effects of constructed wetland treating oily wastewater, wastewater treatment was monitored during five months. The results showed that when the influent flux was 1.2m3/d, the mean removal rates of COD, TN, NH4+-N and mineral oil in the horizontal flow constructed wetland were 54.27%, 53.47%,54.84% and 50.19%, respectively. Constructed wetland had better removal efficiency and run stably in the treatment process of oily wastewater.

scholarly journals The cellulose of Boehmeria nivea as natural flocculants: synthesis, modification, and flocculation analysis

2021 ◽  
Vol 896 (1) ◽  
pp. 012056
Author(s):  
D Fauzani ◽  
S Notodarmojo ◽  
M Handajani ◽  
Q Helmy ◽  
T Kardiansyah
Keyword(s):  
Wastewater Treatment ◽  
Surface Modification ◽  
Removal Efficiency ◽  
Synthetic Wastewater ◽  
Water And Wastewater Treatment ◽  
Turbidity Removal ◽  
Kaolin Suspension ◽  
Boehmeria Nivea ◽  
Water And Wastewater

Abstract Due to their non-toxicity and biodegradability, natural polymeric flocculants have gained popularity in water and wastewater treatment in recent years. Because of its broad availability, renewability, sustainability, and surface modification potential, cellulose, the most common polymer on the planet, is regarded as one of the foundation polymers for flocculant production and modification. The following article consists of a review of the latest developments regarding biopolymers, in particular, cellulose as a natural flocculant. One of the plants that can be developed in Indonesia is Boehmeria nivea, or what is known as Ramie, which contains cellulose that is still not utilized optimally. There is a method of isolation of alpha-cellulose derived from Boehmeria nivea and its application as a flocculant in synthetic wastewater presented in this paper. The alpha-cellulose of Boehmeria nivea was used as a flocculant in jar testing using kaolin suspension (5 g/L). The study shows that adding alpha-cellulose as an aid to PAC slightly increased the turbidity removal efficiency, and further modification of alpha-cellulose by cationic grafts into cationic cellulose is needed.

Comparative Study on the Different Coagulants for Mine Water

2013 ◽  
Vol 800 ◽  
pp. 89-92
Author(s):  
Xiao Guang Zhao ◽  
Yuan Yuan Guan ◽  
Jia Qi He ◽  
Zhu Gui Huang
Keyword(s):  
Organic Matter ◽  
Comparative Study ◽  
Chemical Oxygen Demand ◽  
Removal Efficiency ◽  
Mine Water ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Optimal Dosage ◽  
Turbidity Removal ◽  
Coagulation Tests

This article of mine water as the research object, using different coagulants (PAC, FC, AC) and coagulation tests of the mine water, to determine the removal of turbidity and organic matter most good coagulant PAC. Determine the optimal dosage of 16 mg / l, the mine water effluent turbidity removal efficiency of more than 90%, chemical oxygen demand CODCr removal rate reached more than 60%.

Comparative Study Between Clean Intermittent Self-Catheterization (Cisc) and Continuous Indwelling Catheterization (Cidc) in Relieving Acute Refractory Retention of Urine Due to Benign Enlargement of Prostate (Bep)

2020 ◽  
Vol 21 (2) ◽  
pp. 105-110
Author(s):  
Md Shawkat Alam ◽  
Sudip Das Gupta ◽  
Hadi Zia Uddin Ahmed ◽  
Md Saruar Alam ◽  
Sharif Muhammod Wasimuddin
Keyword(s):  
Comparative Study ◽  
Acute Urinary Retention ◽  
Bladder Capacity ◽  
Inclusion Criteria ◽  
College Hospital ◽  
Medical College ◽  
High Incidence ◽  
Group A ◽  
Group B ◽  
Better Than

Objective: To compare the clean intermittent self-catheterization (CISC) with continuous indwelling catheterization (CIDC) in relieving acute urinary retention (AUR) due to benign enlargement of prostate (BEP). Materials and Methods :A total 60 patients attending in urology department of Dhaka Medical college hospital were included according to inclusion criteria ,Patients were randomized by lottery into two groups namely group –A and group –B for CISC and IDC drainage respectively . Thus total 60 patients 30 in each group completed study. Results : Most men can safely be managed as out-patients after AUR due to BPH. The degree of mucosal congestion and inflammation within the bladder was found to be lower in those using CISC and the bladder capacity in these patients was also found higher.Patients with an IDC had a high incidence of UTIs then that of patients with CISC. During the period of catheterization the incidence of UTI was 43.3% in group B in comparison to 40% in group A; before TURP 36% in group B in comparison to 10% incidence in group A.According to patient’s opinion CISC is better than IDC in the management of AUR. Experiencing bladder spasm, reporting blood in urine, management difficulties, incidence and severity of pain were less in CISC group, and the method of CISC was well accepted by patients as well as their family members. Conclusion: From the current study it may be suggested that CISC is better technique for management of AUR patient due to BPH than IDC. It can also be very helpful when surgery must be delayed or avoided due to any reasons in this group of patients. Bangladesh Journal of Urology, Vol. 21, No. 2, July 2018 p.105-110

Evaluation of a tropical single-cell waste stabilization pond system for irrigation

1995 ◽  
Vol 31 (12) ◽  
pp. 267-273 ◽  
Author(s):  
B. S. O. Ceballos ◽  
A. Konig ◽  
B. Lomans ◽  
A. B. Athayde ◽  
H. W. Pearson
Keyword(s):  
Single Cell ◽  
Removal Efficiency ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Full Scale ◽  
Waste Stabilization Pond ◽  
North East ◽  
Helminth Eggs ◽  
Waste Stabilization ◽  
Better Than

A single full-scale primary facultative pond in Sapé, north-east Brazil was monitored for performance and efficiency. The pond had a hydraulic retention time of 61 days and achieved a 95% BOD5 removal efficiency and had no helminth eggs in the effluent. The effluent failed to meet the WHO faecal coliform guideline for unrestricted irrigation. The pond was dominated by the cyanobacterium Microcystis and gave better than predicted orthophosphate removal. Details of how the system could be simply upgraded utilizing the same land are discussed.

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