Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Nitrate Removal

Removal of Nitrate from Contaminated Groundwater Using Solar Membrane Distillation

Alaa H. Al-Fatlawi; Mohsen Karrabi; Ghassan Abukhanafer; Ahmed AL Samlan

Engineering and Technology Journal, 2019, Volume 37, Issue 3C, Pages 327-332
DOI: 10.30684/etj.37.3C.4

Nitrate contamination is worldwide water pollution posing a major
health hazard to human and animal life. Challenges are being faced to get fresh
water for the areas having a low amount of usable water. This study aims to
asses and evaluates the feasibility of removing nitrate from groundwater by
using cheap approaches. A pilot-scale solar distillation membrane filter, was
designed and constructed for this study, the set up was designed into two
partitions: i) water heater and ii) membrane distillation. The effect of several
operating parameters such as feed and distillate temperature, nitrate
concentration, and pH, on water flux and nitrate removal efficiency, was
investigated. The results showed that 85 and 93 percent removal efficiencies for
nitrate and total dissolved solids, respectively. The effect of important
parameters of solar performance membrane filter distillation (SPMFD) process
including solar collector efficiency (𝜂𝑐
), gained output ratio (GOR) and
significant operating parameters containing feed and condensate temperature,
feed nitrate concentration and pH were studied in this work and it could be
concluded that water flux was increased exponentially with increasing feed
temperature, and under the same operating conditions, average water flux
changed from 9.52 to 34 kg/m2 per hour when temperature increased from 60
to 90 °C gradually. However, no significant effect was found by varying nitrate
and TDS concentration and pH on water flux. It can be concluded that
membrane distillation and solar desalination processes could be the efficient
methodologies to exploit in the large nitrate-affected rural areas of Iraq and its
surrounding with abundant sunlight, particularly during the critical dry season

Biological Treatment of Grey Water Using Sequencing Batch Reactor

Rasha K. Sabri

Engineering and Technology Journal, 2013, Volume 31, Issue 4, Pages 539-550
DOI: 10.30684/etj.31.4B.12

The present study included the application of Sequence Batch Reactor SBR technology for the treatment of domestic grey water which represents (50-80%) of the households wastewater.
Different cycle times were used 6, 8 & 12 hrs. at each cycle time, The characteristics of (PO4-1, NO3-1, COD) were studied of influent, effluent and through interaction samples in the reactor to evaluate the efficiency of the treatment technology used.
It was concluded that removal efficiency of organic matters (COD) increases with increasing the cycle time. Nitrate ( NO3-1 ) removal was dependent on the availability of nutrients for microorganisms. On the other hand, optimum removal of phosphate occurred when aerobic and anoxic periods were equal.
when comparing the values characteristics (S.S, pH) for treated grey water with the Iraqi specification, it was found that there was a fair convergence in values. As for the values of electrical conductivity (EC), they were considered suitable for good bearing salts plants according to U.S. Salinity Laboratory classification.