Estimation of the achievability of the environmental and technological regulations at small wastewater treatment facilities

Summary

The transition of water and wastewater services to technological regulations imposes new environmental requirements for wastewater treatment facilities. The probability of meeting environmental and technological regulations at 117 sites was estimated. For two groups of treatment facilities (midget, small and minor), the achievability of the regulations for suspended solids, BODtotal, nitrogen (ammonium, nitrite, nitrate) and phosphate-phosphorus was determined. The smallest proportion of the facilities could provide for meeting the maximum permissible concentrations of suspended solids (12.2 and 8.8%), phosphate-phosphorus (24.5 and 8.3%) and ammonium nitrogen (12.2 and 9%) in the effluents discharged into water bodies of commercial fishing importance. Meeting the technological regulations for water bodies of category B looks more likely and is 30.6% for ammonium nitrogen, for other indicators – more than 70%.

Key words

domestic wastewater , sewerage treatment facilities , technological indicators , environmental regulations , achievability