Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : filter

The Performance of Oxidation Pond for Wastewater Treatment in Rural Areas a Case Study “Al-Dewaniyah Province"

Mohammed Ali I.Al-Hashimi; HayderTaleeHussan

Engineering and Technology Journal, 2014, Volume 32, Issue 4, Pages 1053-1070

This research is concerned with study and checks the suitability of waste oxidation ponds (WOP) for treating wastewater in Al-Dewaniyah province by taking a sample of community of 10000 populations.
Experimental work had three cases depending on many considerations such as economical and specification of final effluent. A model of two ponds (facultative and aerobic) in series was used as first case of experimental work. Then third pond with aeration process to aerobic pond were added to the series as second case to improve the effluent. At last, sand filter was used to polish the final effluent from aerobic pond.
The three ponds had the same surface area (5.75m*2m) but with different depths, where it was 2m for anaerobic pond, 1.5m for facultative pond and 0.75m for aerobic pond. From the tests taken for the three cases, the results obtained for the last two cases were much better when compared with first case. In the experimental work a sand filter used for algae removal. Sand filter contributed in improving final effluent by decreasing total suspended solid (TSS) also in increasing removal efficiency of biochemical oxygen demand (BOD) and chemical oxygen demand (COD).At the end, the results of this work could be an invitation to use waste oxidation pond for wastewater treatment in rural areas or even small communities in Iraq but it may need more examinations to get best results.

Design and Simulation of a Second-Order Universal Switched- Capacitor Filter as a 10-Pin Dual-In-Line Package Integrated Circuit

Abdul Kareem K. A. Raheem; Salam Waley Shneen; Manal Hadi Jaber; Ahmed H. Reja

Engineering and Technology Journal, 2012, Volume 30, Issue 18, Pages 3175-3191

This paper explains the design of a Universal (Low, High, Band and Notch)
Second-Order Filter using switched capacitor (SC) technique. The design depends
on the crystal oscillator circuit that generates two non-overlapping clocks by
making full use of the two independent comparators of the LM741. The oscillator
circuit is used to drive a switched-capacitor integrator which is used in the design
of the universal second order filter. The circuit is performed as a single IC
(Integrated circuit) which can be used for different standard applications. The
proposed IC design differs than other IC's such as MF10 by adding the notch filter
to this design for used in wide band of applications. The design is simulated using
MultiSim 9 program.