Assessing Domestic Wastewater Treatment Based on Wastewater Quality Index WWQI Using Constructed Wetland at Al-Diwaniyah, Iraq
Bibliographic record
Abstract
This study investigated suitability of domestic wastewater treated by wetlands at Al-Diwaniyah city in Iraq for irrigation purposes.A physical model has been built to consist of a primary sedimentation tank feeding a vertical subsurface flow-constructed wetland (VSSFCW) unit, and operated with a continuous flow rate of 150, 86 and 75 liters/hr of raw domestic wastewater supplied from a manhole of a residential area at Al-Diwaniyah city.The sedimentation tank was gravitational type with a rectangular shape.The VSSFCW unit was 0.24 m 3 in active size having underdrain and three stratified gravel layers supporting 8 cm sand layer.The unit vegetated with 12 plants of Typha domingensis.The model operated over the course eight months, August 2022 to April 2023, through which influent and effluent samples of the unit were collected and tested for Potential of Hydrogen (pH), Electrical Conductivity (EC), Total Suspended Solids (TSS), 5-day Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), Total Phosphorous (TP), and Total Nitrogen (TN).The objectives of this study were; to evaluate the treatment efficiency based on water quality index (WQI) classifications of the Canadian Council of Ministers of the Environment (CCME), and assessing treated water validity for irrigation use according to Iraqi standards (IQS-2012) and Egyptian guidelines for the reuse of recovered water (Egypt Decree 2013).It was observed that using VSSFCW can effectively improve the characteristics of the wastewater.Some parameters in the treated wastewater agreed with the Iraqi standards (IQS-2012) like; pH (7.16 to 7.5), EC (1919-1948 S/m), TSS (7 to 10 mg/L) and TN (2.14 to 6.25 mg/L).The other parameters were slightly higher than the limits like; BOD5 (12 to 75 mg/L), COD (104 to 200 mg/L) and TP (2.182 to 3.35 mg/L).However, the WQI computed according to water quality index of Canadian Council of Ministers of the Environment (CCMEWQI) is 69.6 considered fair within the range 66 -79 and can be used for irrigation directly or after dilution with clean water.Results of this study encourage adopting the VSSFCW to treat domestic wastewater with saving in cost of construction, operation and transportation requirements as compared with conventional treatment systems.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".