Odour Menace from Wastewater Treatment Works Sample Clauses

Odour Menace from Wastewater Treatment Works. The process of wastewater collection, conveying or treatment has the potential to generate and release odours to the surrounding area. Most odour problems occur in the collection system, in primary treatment facilities and in solids handling facilities as well as the sludge drying beds. The most frequently reported symptoms attributed to odours from treatment plants include headache, nausea, hoarseness, cough, nasal congestion, palpitations shortness of breath, stress, drowsiness, alterations in mood, and eye, nose, and throat irritation. Hydrogen Sulphide (H2S) is the most prevalent gas associated with domestic wastewater collection and treatment. The conditions leading to H2S formation usually favour the production of other odorous gases such as ammonia which may have considerably higher detectable odour thresholds, and consequently H2S may be an indicator of their presence. Exposure of receptors to levels of hydrogen sulphide above 5ppb can lead to odour nuisance. Severity of Impact -2 Spatial Scope of the Impact -3 Duration of Impact -4  Ensure appropriate covering/ventilation of the pre-treatment unit;  Ensure appropriate handling and removal of grit/grease;  Ensure proper sizing and alignment of the lagoons;  Ensure scum is appropriately disposed off or properly stabilized;  Ensure that the pond series have adequate water flow and aeration to reduce the potential of odour formation;  The perimeter of the proposed site should be vegetated with trees and plants of varying heights thereby forming windbreaker and reduce dispersion of odour;  Repair the roofs of the sludge drying beds to ensure quick drying of sludge and appropriate disposal to reduce odour emanating from wet sludge.
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