Abstract
The article touches upon the efficiency of small capacity wastewater treatment plant for industrial sewage. Current operation scheme fails to meet existing regulation requirements due to several drawbacks. The article describes a technology for wastewater treatment and the construction of bioreactor to implement the scheme above. The technology includes averaging tank with preliminary mechanical treatment and bioreactor with floating feed. This provides the efficiency of removal of organic compounds and nutrients: BOD - 96%, nitrogen - 99%, phosphorus - 89%.
Highlights
The difficult engineering task is to achieve environmental standards in small wastewater treatment plants (WWTP)
Low efficiency of small WWTP happens due to their features and shortcomings [2]: – Technology. – Operation. – Economy. – Limited technical and financial resources in rural areas
All of the above allows us to distinguish small WWTP in a separate large group of objects that require an individual approach to modernization and operation
Summary
The difficult engineering task is to achieve environmental standards in small wastewater treatment plants (WWTP). 3 % of small WWTP in Vologda region (Russia) meet required concentrations for outlet phosphorus, and 5% for ammonia nitrogen [1]. These indicators show maximum ratio of outlet concentration to required values among the main parameters: total biochemical oxygen demand (BODtot), suspended solids (SS), ammonia nitrogen (N-NH4), nitrite nitrogen (N-NO2), and nitrate nitrogen (N-NO3); phosphorus phosphate (P-PO4) (Figure 1). Low efficiency of small WWTP happens due to their features and shortcomings [2]: – Technology (physical and moral depreciation, violation of operating conditions, the hydraulic underload/overload, high unevenness in the flow of wastewater). All of the above allows us to distinguish small WWTP in a separate large group of objects that require an individual approach to modernization and operation
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