Physico-chemical and Biological Aspects of Monsoon Waters of AShulia for Economic and Aesthetic Applications: Preliminary Studies

Abstract

In the north-eastern part of Dhaka the 'Turag River' extends over Ashulia thana with a few branches. The north-eastern part of Ashulia thana mainly constitute low lands with a physiography of Madhupur Tract interlaced with Brahmaputra Floodplain. Monsoon extends over these lands from May to October and from July to October these lands remain flooded with a water depth of more than 180 cm to less than 275 cm due to surface runoff of rain water and overflow of the river canals. The area under water during this four month period can be used for economic applications such as various types of fishery as well as enhancing the present recreational applications. For these purposes the physical, chemical, and biological aspects of the water are studied to evaluate its suitability for the applications. The study was held over the period of July through December, 2006, samples being taken once every month. The physical parameters covered transparency, odor, temperature, salinity, EC, TSS, and TDS. The chemical parameters of water studied were pH, DO, BOD 5 , COD, hardness, NO 2 ---N, NO 3 ---N, PO 4 3---P, SO 4 2---S, Cl-, Na, K, Ca, Fe, Ni, Cu, Zn, Cd, Pb, and Hg. Among the biological parameters 'phytoplankton' and 'zooplankton' were qualitatively identified in microscopic observation up to genera. From July to October the water was transparent and of good odor, temperature ranged from 28.2 O C to 24.6 O C, salinity within 0.58 to 0.83 mg/L, EC within 250 to 608 µ mho/cm, TSS 0.42 to 0.82 mg/L, and TDS within 2.8 to 5.2 mg/L. Among the chemical parameters, pH ranged from 6.6 to 7.4, DO within 6.4 to 6.9 mg/L, BOD5 within 1.5 to 3.28 mg/L, COD within 3.04 to 12.89 mg/L, hardness 26.08 to 37.5 mg/L, NO 2 --N from undetectable to maximum 0.562 mg/L, NO 3 --N within 0.539 to 2.158 mg/L, PO 4 3 --P 2.35 to 2.75 mg/L, SO 4 2 --S 0.23 to 0.29 mg/L, Cl-1.65 to 6.16 mg/L, Na 3.6 to 12.5 mg/L, K 9.7 to 11.5 mg/L, Ca 6.52 to 14.82 mg/L, Fe 0.1269 to 0.5062 mg/L, Ni 0.028 to 0.050 µg/L, Cu 0.028 to 0.043 mg/L, Zn 0.023 to 0.048 µg/L, Cd 0.0023 to 0.0043 µg/L, Pb 0.043 to 0.093 µg/L, and Hg was not detected at ppb level. Among the biological parameters a number of phytoplankton were identified covering the classes of Bacillariophyceae, Chlorophyceae, Euglenophyceae, and Cyanophyceae. The zooplanktons included the orders Cladocera and Copepoda within the class Crustacea of phylum Arthropoda.

Roles of Nutrient Regime and N:P Ratios on Algal Growth in 182 Korean Agricultural Reservoirs

“…During the monsoon period the concentration of TP had been increasing in the reservoirs due to intense rainfall, and a decreased concentration of TN is due to higher dilution [36]. The same scenario is being frequently observed in other tropical and subtropical Asian reservoirs, including those of Bangladesh [37], India [38], Nepal [39], and Sri Lanka [40].…”

Physicochemical Parameters and Heavy Metal Concentration in Water at the Mokesh Beel of Bangladesh

“…The collected surface water samples from the Turag river contained significant amount of Cu and ranged from 0.01-0.02, 0.02-0.03 and 0.21-0.27mg/l during postmonsoon, pre-monsoon and monsoon season, respectively (Meghla et al, 2013) which is almost similar to the present study. The concentration of Cu ranged from 0.028-0.043mg/l at Ashulia point in the Turag River during the period from July to October (Khan et al, 2007). ISSN 1999-7361 The study revealed that the highest concentration of zinc (Zn) in beel water was 0.79mg/l at sampling St-1 in April while the lowest was 0.56mg/l at St-3 in February (Fig.…”

“…The temperature ranged from 22.9-36.0ºC along the Shitalakhya river in dry season during the sampling period where higher temperature was April, compared to February and March due to high air temperature (Alam et al, 2006), which is almost similar to the present study. The temperature ranged from 24.6-28.2ºC at Ashulia point in the Turag river during the period from July to October (Khan et al, 2007).…”

Quality Assessment of Surface and Drinking Water of Nakla Paurosova, Sherpur, Bangladesh

“…None of these three heavy metals, Arsenic (As), Lead (Pb) and Iron (Fe) were detected in both pond and jar water, but iron was detected in six samples in tube-wells where only one was positive to arsenic ( Figure 9). But Lead (Pb) and Iron (Fe) were detected in pond water by another study conducted in Ashulia area, Bangladesh [50]. A recent study showed that arsenic was not detected in jar water of Dhaka city but iron was in acceptable limit [49].…”