In recent years, with the country's attention to environmental protection, people's awareness of environmental protection, China's sewage treatment industry is booming. The development speed of Panjin Hongshi Environmental Protection Technology Co., Ltd. is also in the forefront in the history of development, and the sewage treatment process has evolved from a single traditional activated sludge method to a variety of processes or a combination of various processes. Different processing technology will produce different operation effects, operation costs will also be different. Traditional activated sludge process and deformation process are mostly used in large sewage treatment plants, while oxidation ditch process is mostly used in small sewage treatment plants. The construction cost of oxidation ditch process is lower than that of traditional activated sludge process, but its operation cost is higher than that of the latter. The smaller the scale of sewage treatment plant, the more obvious the advantage of oxidation ditch process. Urban sewage treatment plant is a big consumer of energy consumption.this paper explains the importance of saving energy and reducing consumption to sewage treatment plant through the deion and analysis of its various costs, and gives detailed cost control measures.
Sewage treatment plant cost composition
1. Direct expenses
(1) Energy costs: including electricity and water costs, of which electricity is the main cost, accounting for about 40-50% of the total cost.
(2) Material costs: including flocculant fees, laboratory fees, low-value consumables, etc.
(3) Direct labor and welfare: wages and welfare of all production personnel.
2. Manufacturing expenses
Including maintenance cost, raw material cost, spare parts cost, etc
3. Period expenses
Expenses incurred by the management department for the organization and management of production, including administrative, departmental overhead, finance, depreciation of equipment and other indirect costs.
4. Cost analysis of sewage treatment
(1) In the production cost, electricity consumption and pharmaceutical consumption must occur in the production process, and account for a large proportion, must be strictly controlled in the production process, in order to effectively reduce the cost.
(2) In the production cost, staff salary and welfare are the driving force to improve staff enthusiasm, enhance enterprise vitality and cohesion, further improve energy saving and consumption reduction, and also the symbol of enterprise and social development level. Under normal production operation, the higher the proportion, the better the enterprise development.
(3) On the basis of the sustainable development of the enterprise, the manufacturing cost should minimize the input of maintenance, overhaul and fixed assets, so as to maximize the profit of the enterprise.
(4) Management fees are an integral part of enterprise operating costs and should be controlled to minimize unnecessary expenditures and reduce costs.
5. Cost calculation of sewage treatment plant
(1) Electricity cost: Sewage treatment enterprises one of the most energy consumption equipment, including various types of pumps, oxygen equipment such as air blower and sludge thickening and dewatering equipment, sewage treatment unit consumption calculation, on the one hand, can be used according to the equipment Numbers and power were analyzed, and on the other hand this enterprise in the wastewater treatment unit consumption statistics analysis, at the same time with reference to local related standards, Formulate reasonable sewage treatment unit consumption suitable for the enterprise.
For example, there are clear assessment requirements on the single consumption of sewage treatment in the assessment standard of operation management of urban sewage treatment plant in A province. The assessment of the single consumption of first-level A standard sewage treatment is divided into four levels: ≤0.34 degrees/cubic meter, 0.34 degrees/cubic meter -0.37 degrees/cubic meter, 0.37 degrees/cubic meter -0.42 degrees/cubic meter and ≥0.42 degrees/cubic meter. Grade 1 B standard is assessed at 70% of the unit consumption of Grade 1 A standard, and those lower than Grade 1 B standard are assessed at 50% of the unit consumption of Grade 1 A standard. Therefore, the normal power consumption index of secondary sewage treatment enterprises is in the range of 0.17~0.42 KWH/cubic sewage. According to the current electricity price of 0.852 yuan/KWH (taking Nanjing as an example), the power consumption cost can be calculated as: 0.145~0.358 yuan/cubic sewage.
(2) agent cost: most of the agents in sewage treatment plants are polyacrylamide used by sludge dehydrator or iron chloride and calcium oxide used by sludge plate and filter press dehydration.
