Atmospheric reaeration process plays a key role in degradation of organic matter and self-purification processes affecting dissolved oxygen (DO) concentrations rivers streams. Moreover, water quality (WQ) can be highly dependent on flow velocity conditions. Where, rates are positively correlated with high velocity. Therefore, the present work reports deep insights concentration DO biochemical d...

Constructed wetlands are a nature-based engineering solution enabling polishing of septic tank effluents at low-cost. However to date, the influence planting on treatment efficiency remains little understood. Here we report case study evaluating performance two near-identical Horizontal Sub-Surface Flow Wetlands (HSSF-CW) deployed school in southern India. The HSSF-CWs were similar size and con...

Nghiên cứu được thực hiện nhằm tìm ra các thông số vận hành của bể keo tụ điện hóa để tiền xử lý nước thải nhà máy in. Các thí nghiệm đã ghi nhận tối ưu gồm: góc nghiêng cực 45o­­, khoảng cách 1 cm, mật độ dòng 240 A/m2, hiệu thế 12 V, thời gian lưu 30 phút. Nước có màu 1.363 PCU, pH = 6,27, SS 3187 mg/L, BOD5 1.275 TKN 35,16 TP 8,73 Zn 5,4 mg/L và Cu 0,8 mg/L; sau khi bằng hóa, 50 7,33, 149,72...

Nghiên cứu nhằm đánh giá hiệu quả xử lý nước thải sinh hoạt bể phản ứng thể di động (Moving bed biofilm reactor - MBBR) kết hợp với cột màng lọc tự chế ở những thời gian lưu khác nhau. Bể MBBR có tích 45,54 L chứa 40% K3, và quy mô phòng thí nghiệm được sử dụng trong nghiên cứu. Kết cho thấy tải nạp vào là 0,47 kg BOD5/m3/ngày, 0,79 m3/m2/ngày qua màng, 6 giờ, đầu ra đã đạt QCVN 14:2008/BTNMT (...

This paper presents results of investigations on physicochemical treatment of vegetable oil refinery wastewater (VORW), namely acid and technological wastewater. The study has shown that VORW has a varying high pollution load (organic matter, sulfates, phosphates and chlorides) and the removal of these pollutants from acid wastewater was more effective than that from technological wastewater; t...

The Anzali Ramsar Convention wetland is located in an ecologically and economically important region in Iran. The wetland is largely surrounded by agriculture, natural forests and rangelands (approximately 36% and 63%, respectively). Urban areas consist of less than 1% of the total area. Urban land use produces the highest rates of nutrient transfer into the lake as TN, TP and BOD5 equal to 24,...

Data on this paper show the concentrations of COD, BOD5, TSS, K+, Ca2+, Na+, Cl-, [Formula: see text], [Formula: see text], Mn2+, Fe2+, Mg2+, Zn2+, Ni, Pb, Cu and Cd in the influent and effluent of wastewater, and also the nematode eggs, total and fecal coliform in effluents from wastewater treatment plant of Rasht, Guilan Province, in Iran. Measurements of pollutants in influent and effluent w...

Urbanization has been found to impact stormwater runoff quantity and quality. A study catchment with mixed land use, residential and industrial were investigated and the water quality discharged from the catchment were sampled and tested for four basic water quality parameters; BOD5, NH3-N, NO3-N and P. One dry weather flow and several stormwater runoff were sampled. Results were compared to th...