A novel and cost-effective sewage treatment system consisting of UASB pre-treatment and aerobic post-treatment units for developing countries

1997 ◽  
Vol 36 (12) ◽  
Keyword(s):  
Developing Countries ◽  
Sewage Treatment ◽  
Cost Effective ◽  
Post Treatment ◽  
Treatment System ◽  
Pre Treatment ◽  
Sewage Treatment System

A novel and cost-effective sewage treatment system consisting of UASB pre-treatment and aerobic post-treatment units for developing countries

1997 ◽  
Vol 36 (12) ◽  
pp. 189-197 ◽  
Author(s):  
Izarul Machdar ◽  
Hideki Harada ◽  
Akiyoshi Ohashi ◽  
Yuji Sekiguchi ◽  
Hiroyuki Okui ◽  
...  
Keyword(s):  
Developing Countries ◽  
Low Cost ◽  
Sewage Treatment ◽  
Cost Effective ◽  
Post Treatment ◽  
Cod Removal ◽  
Treatment System ◽  
Treatment Unit ◽  
Pre Treatment ◽  
Sewage Treatment System

A novel sewage treatment system was proposed, which consists of a UASB anaerobic pre-treatment unit and the following DHS (downflow hanging sponge-cubes) aerobic post-treatment unit, as a low-cost and easy-maintenance process for developing countries. Over six months experiment by feeding sewage our proposed system achieved 94% of total-COD removal, 81% of soluble-COD removal, and nearly perfect SS removal and total-BOD removal at the overall HRT of 8.3 hr (7 hr in UASB and 1.3 hr in DHS unit). Moreover, the DHS reactor was capable of performing high (73–78%) nitrification. Our whole system requires neither external aeration input nor withdrawal of excess sludge.

Combination of a UASB reactor and a curtain type DHS (downflow hanging sponge) reactor as a cost-effective sewage treatment system for developing countries

2000 ◽  
Vol 42 (3-4) ◽  
pp. 83-88 ◽  
Author(s):  
I. Machdar ◽  
Y. Sekiguchi ◽  
H. Sumino ◽  
A. Ohashi ◽  
H. Harada
Keyword(s):  
Sewage Treatment ◽  
Cost Effective ◽  
Ammonia Nitrogen ◽  
Treatment System ◽  
Uasb Reactor ◽  
Municipal Sewage ◽  
Combined System ◽  
Treatment Unit ◽  
Pre Treatment ◽  
Sewage Treatment System

The second generation of our originally proposed sewage treatment system, which consists of a UASB reactor as an anaerobic pre-treatment unit and curtain-type DHS (downflow hanging sponge) reactor as an aerobic post-treatment unit, was installed at a municipal sewage treatment site. A 550-day continuous experiment demonstrated that the whole combined system successfully achieved 94–97% of unfiltered-BOD removal, 81–84% of unfiltered-COD removal, and 63–79% of SS removal, at an overall HRT of 8 h (6 h for UASB and 2 h for DHS units). The combined system performed an excellent organic removal as well as a fairly efficient nitrification, i.e. 52–61% of ammonia-nitrogen removal. Our proposed combined system possesses prominent advantages: requiring neither external aeration input nor excess sludge withdrawal.

A New Sewage Treatment System with Fluidized Pellet Bed Separator

1993 ◽  
Vol 27 (11) ◽  
pp. 185-192 ◽  
Author(s):  
Tatsuhiko Suzuki ◽  
Norihito Tambo ◽  
Genzo Ozawa
Keyword(s):  
Molecular Weight ◽  
Biological Treatment ◽  
Membrane Filter ◽  
Sewage Treatment ◽  
Treatment System ◽  
Organic Substances ◽  
Treatment Rate ◽  
Treated Water ◽  
Biological Filter ◽  
Sewage Treatment System

A new sewage treatment system which is composed of a fluidized pellet bed separator, aerobic biological filter and micro–membrane filter was studied. In the newly proposed system, at the first stage, higher molecular weight organic substances and suspended matter are removed by way of chemical coagulation and flocculation. For the operation, a new fluidized pellet bed separator with high separation rate of 200-300 m/day is introduced to improve the treatment rate. A large percentage of organ ic substances are removed by the new coagulation/flocculation process. Hence, the total BOD load to be applied to the following biological treatment becomes very low. In addition to this, the organic substances in the effluent from the fluidized pellet bed separator are on lylower molecular weight substances which are easily biologically decomposed. Therefore easily decomposing and lower concentration pollutants enable use of a simple biological treatment p rocess such as aerobic biological filter with as short a detention time as 1 hour. Finally, effluent from the biological filter is treated by a micro-membrane filter. By the membrane process, suspended matte rs in the biologically treated water can be removed completely. Phosphate concentration of the treated water is very low, which is caused by aluminum coagulation in the first step and biological intake of the nutrient in the second step followed by complete sol id liquid separation in the third step.

The Design of Control System for Sewage Treatment Based on PLC

2014 ◽  
Vol 1037 ◽  
pp. 339-342
Author(s):  
Zi Sheng Zhang ◽  
Yi Wang ◽  
Li Wang ◽  
Jin Cui ◽  
Chun Sheng Wang
Keyword(s):  
Automatic Control ◽  
Sewage Treatment ◽  
Control Program ◽  
Coarse Grid ◽  
Control Flow ◽  
Treatment System ◽  
Programmable Logic ◽  
Control Parameters ◽  
Flow Charts ◽  
Sewage Treatment System

The main aim of this paper is to improve the control efficiency of the sewage treatment system, by analyzing the various control parameters of sewage treatment system and comparing different ways of automatic control, Siemens S7-200 Programmable Logic Controller(PLC) is applied to the system. We designed the control flow charts of coarse grid and dewatering system, compiled the total manual program and automatic control program of aerated grit chamber by using STEP 7-Micro/WIN 32 software, and realized the related equipment automatic control in the sewage treatment system which can run the coarse grid machine that runs for 20 minutes and stops for 2 hours alternately et cetera. The results show that the controllability of sewage treatment system is enhanced and the efficiency is improved.

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