People Watch

2009 ◽  
Vol 13 (04) ◽  
pp. 82-83
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Clinical Research ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Chief Operating Officer

Medicilon/MPI Pre-clinical Research-Shanghai Announces New President and Chief Operating Officer. Singapore Honors Dutch Scientist for Low-cost Waste Water Treatment. New CEO for AVA. Spain's Minister for Health and Consumer Affairs Visits Singapore.

scholarly journals A review on bioflocculation using microalgae for nutrient removal from waste water.

2021 ◽  
Vol 10 (1) ◽  
pp. 1-10
Author(s):  
Swathy Krishna
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Surface Water ◽  
Nutrient Removal ◽  
Environmental Concern ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Dual Purpose ◽  
Excellent Candidate ◽  
Conventional Methods

In recent decades, the eutrophication of surface water has become a major environmental concern. Increased concentration of nutrients such as nitrogen and phosphorous lead to eutrophication condition which highlights the demand for effective and economical methods of removing nitrogen and phosphorous from waste water. Bio flocculation using microalgae is an excellent candidate for satisfying the dual purpose of nutrient removal and waste water treatment. It has so many advantages over conventional methods such as toxic free, no chemical is needed, low cost etc. In this review the bio flocculation of microalgae, its mechanisms, applications and harvesting methods are discussed. Keywords: Bio flocculation, microalgae, nutrient removal, waste water treatment  

scholarly journals PENERAPAN ELEKTROOSMOSIS UNTUK PENGERINGAN SLUDGE DARI PENGOLAHAN LIMBAH CAIR

REAKTOR ◽  
2013 ◽  
Vol 14 (3) ◽  
pp. 204
Author(s):  
Darmawan Darmawan ◽  
Dyah Tjahyandari Suryaningtyas ◽  
Juniska Muria Sariningpuri
Keyword(s):  
Waste Water ◽  
Stainless Steel ◽  
Water Treatment ◽  
Water Content ◽  
Chemical Elements ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Stainless Steel Cathode ◽  
Steel Cathode ◽  
Semi Solid

APPLICATION OF ELECTROOSMOSIS FOR DEWATERING OF SLUDGE FROM WASTE WATER TREATMENT. Wastewater treatment produces semi-solid residue (sludge) that must be handled carefully during dumping and discharge to avoid polluting the environment. A low cost and easy treatment of dewatering is needed. This research aimed to apply electroosmosis technique for dewatering sludge in order to seek for parameters that can efficiently reduce water content of sludge, including range of voltage, type of electrodes, and distance between electrodes; and to determine the effect of electroosmosis processes on changes of chemical characteristics of sludge. The results showed that: (1) electroosmosis dewatering occurred on the sludge taken from waste water treatment of landfill but not on sludge from water purification plant (PDAM), (2) direct current voltage of 30 volts was the optimum voltage, (3) copper rod cathode provided electroosmosis process as good as stainless steel cathode and both were better than the woven stainless steel cathode, (4) the dewatering time to reduce 1200% (w/w) water content to about 400% was about 40 hours for sludge of 2500 cm3 in volume (laboratory bench scale), (5) the anode need to reinserted gradually approaching the cathode due to current lost when the water content at the anode point reached 400% and sludge at the point shrink, and (6) some chemical elements in the sludge decreased significantly after treatment. Pengolahan limbah cair menghasilkan residu berupa bahan semi padat yang dikenal sebagai sludge. Sludge tersebut juga perlu dikelola penyimpanan dan pembuangannya agar tidak mencemari lingkungan. Salah satu pengelolaan sludge yang perlu dilakukan adalah pengeringan (dewatering). Salahsatu teknik dewatering yang mungkin diterapkan ialah teknik elektroosmosis, yaitu teknik yang memanfaatkan adanya pergerakan air pada media poros di dalam medan istrik searah. Penelitian ini bertujuan untuk mencari parameter sistem dewatering secara elektroosmosis yang dapat menurunkan kadar air sludge paling efisien dan untuk mengetahui pengaruh elektroosmosis terhadap karakteristik kimia sludge. Hasil penelitian menunjukkan bahwa: (1) pengeringan sludge terjadi pada jenis sludge IPAL TPA namun tidak pada jenis lumpur PDAM; (2) tegangan listrik searah sekitar 30 volt merupakan tegangan optimum; (3) katoda batang tembaga menghasilkan proses elektroosmosis yang sebanding katoda batang stainless steel dan lebih baik dibanding katoda stainless steel anyam; (4) waktu pengeringan dari kadar air awal 1200% (b/b) hingga kadar air akhir sekitar 400% untuk volume sludge 2500 cm3 (skala laboratorium) sekitar 40 jam; (5) anoda perlu dipindahkan secara bertahap mendekati katoda karena arus terputus pada saat sludge di titik anoda mencapai kadar air sekitar 400% dan mengalami pengerutan; dan (6) kadar beberapa unsur kimia dalam sludge menurun secara signifikan setelah perlakuan.

Low-Cost and Low-Energy Wastewater Treatment Systems: A South African Perspective

1991 ◽  
Vol 24 (5) ◽  
pp. 241-246 ◽  
Author(s):  
A. Batchelor ◽  
R. Bocarro ◽  
P. J. Pybus
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Low Energy ◽  
Treatment System ◽  
Water Treatment System ◽  
Operational Information ◽  
African Perspective ◽  
Capital Construction

An overview of waste-water treatment alternatives in South Africa is presented. A comparison of the capital, operating and maintenance costs of biological filters, bio-discs, stabilisation ponds and an extended-aeration-actiyated sludge system suggest that stabilization ponds may be regarded as a low cost, low energy waste-water treatment system. However, in some instances, due to legal and land requirements they are not appropriate. In these instances a number of interacting factors play a role in determining the lowest cost option. The capital construction and operating costs of constructed wetlands are similar to those of stabilisation ponds but due to lack of full scale operational information they are not yet widely used as a waste-water treatment system.

A Low-Cost and High-Efficiency Solution for Sugar Factory Waste Water Treatment

1991 ◽  
Vol 24 (1) ◽  
pp. 75-82 ◽  
Author(s):  
W. von der Emde ◽  
H. Kroiss
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
High Efficiency ◽  
Sugar Industry ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Operational Reliability ◽  
Sugar Factory ◽  
Treated Effluent

The main goals for the design of waste water treatment plants are high efficiency, high operational reliability and minimal costs. The challenge to have very low investment costs especially exists for industrial plants which are only in operation for several months every year as e.g. in the beet sugar industry in Central Europe. A case study of an Austrian sugar factory treatment plant shows that using very simple and low-cost structures does not affect the efficiency of the treatment. This factory is also one of the rare cases where biologically treated effluent is recirculated to reduce fresh water consumption. Special emphasis is put on the start-up process, the influence of shock loadings in the influent, and design and operation of the plant.

Development of a Model System for Participatory Community Waste Water Treatment Using Low-cost, Space-saving Technology in Densely Populated Area of Yogyakarta Special Province

2010 ◽  
Vol 5 (4) ◽  
Author(s):  
N. Tanaka ◽  
H. Soejarwo ◽  
A. Soejarwo
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Three Dimensional ◽  
Model System ◽  
Community Members ◽  
Populated Area ◽  
Space Saving ◽  
Rotating Biological Contactors

A model system for participatory communal waste water treatment system was developed in densely populated area of Yogyakarta special province. After the community member's awareness for sanitation and motivation for the system was developed, affordable technology was carefully selected. As the community member's income was low and the available space for the system was very limited, rotating biological contactors with three dimensional lattice media was selected. The technology was also characterized with easiness of operation. After short training of operation and maintenance, the system has been continuously operated by community members with their own expense.

scholarly journals Facial Synthesis of Adsorbent from Hemicelluloses for Cr(VI) Adsorption

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1443
Author(s):  
Yi Wei ◽  
Wei Chen ◽  
Chuanfu Liu ◽  
Huihui Wang
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Adsorption Capacity ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Ammonia Solution ◽  
Langmuir Model ◽  
Raw Material ◽  
Maximum Adsorption Capacity ◽  
Chemical Fiber

It is challenging work to develop a low-cost, efficient, and environmentally friendly Cr(VI) adsorbent for waste water treatment. In this paper, we used hemicelluloses from chemical fiber factory waste as the raw material, and prepared two kinds of carbon materials by the green hydrothermal method as adsorbent for Cr(VI). The results showed that hemicelluloses hydrothermally treated with citric acid (HTC) presented spherical shapes, and hemicelluloses hydrothermally treated with ammonia solution (HTC-NH2) provided spongy structures. The adsorption capacity of the samples can be obtained by the Langmuir model, and the adsorption kinetics could be described by the pseudo-second-order model at pH 1.0. The maximum adsorption capacity of HTC-NH2 in the Langmuir model is 74.60 mg/g, much higher than that of HTC (61.25 mg/g). The green hydrothermal treatment of biomass with ammonia solution will provide a simple and feasible way to prepare adsorbent for Cr(VI) in waste water treatment.

The Advantages of a Compact Filter for Individual or Semi-Collective Waste Water Treatment

1993 ◽  
Vol 27 (1) ◽  
pp. 41-50 ◽  
Author(s):  
A. Fazio ◽  
G. Warot ◽  
P. Vander Borght
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Rural Areas ◽  
High Performance ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Point Of View ◽  
Effluent Treatment ◽  
Septic Tank ◽  
Surface Distribution

In certain rural areas, collective water treatment is not an economically viable solution due to the cost of the water collection facilities (difficult terrain, distance between the houses); for various reasons, however, the traditional individual water treatment system is not highly regarded (bad installation, insufficient maintenance, …) and thus, work has been carried out to develop a high-performance and compact alternative solution for domestic waste water treatment. This alternative system makes use of a compact sand filter installed downstream from the septic tank, the filter's performance is based on supply regulation and improvement of the waste's surface distribution. Hydraulic laboratory studies and follow-up on a testing stand using real effluent have enabled us to develop a standardized compact system which is suitable for use in most terrains. The filter's purification performance is outstanding; at a daily supply rate of 150 l/m2, the average purification yields are over 90 % for COD, BOD, NH4, NKT From the bacteriological point of view, bacterial contamination is also significantly reduced. Laboratory tests are being carried out at present, with the aim of further improving purification by inducing a denitrification process enabling reduction of nitrate levels. This system's compact overall dimensions and relatively low cost mean that it can be used not only for individual waste water treatment but also for effluent treatment for small communities (≤ 400 inhabitant equivalent).

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