Transformation of Chemical Phosphorus Removal Facilities of Baimang Water Purification Project
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In order to be in compliance with the stringent discharge requirement of total phosphorus in Discharge Standard of Polluants for Municipal Wastewater Treatment Plant(GB18918-2002), the existing chemical phosphorus removal facilities of Baimang water purification project were transformed. A new facility for dosing lime and PFS was added in Pre-treatment phase, media adsorption of phosphorus removal system was added in the effluent of rapid infiltration pool. After transformation, the effluent total phosphorus basically can achieve the Ⅰ-A criteria specified in GB18918-2002.Cite
Second class of the Integrated Wastewater Discharge Standard(GB8978-1996) was employed by some projects constructed before 1999.It is unable to meet the current national sanitary standard of first B class of Municipal Wastewater Treatment Plant discharge standards(GB 18918-2002) at nitrogen and phosphorus.Water quality parameters of inflow have characteristics of low C/N.Sewage treatment system has been reconstruction for up-to-standard.Bioselection pool,anaerobic tank and Anoxic tank have been construction to combine with Oxidation Ditch to A-A2O Process.Bioselection pool can eliminate the adverse effects of nitrification solution on anaerobic phosphorus and improve the effect of nitrogen and phosphorus removal process for the follow-up A2O.It can provide a reference for the old factory converted into nitrogen and phosphorus removal process.
Oxidation ditch
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InterChina (Qinhuangdao) Wastewater Treatment Plant was built and operated in BOT mode. It had treatment capacity of 12×10~4 m~3/d, and adopted A/O process without primary clarifier for phosphorus removal. The main design parameters and control process of each unit were introduced and the efficiency of removal of organic matters and phosphorus was summarized. The key factors affecting the A/O process for phosphorus removal were analyzed.
Clarifier
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UCT process was used to treat low-concentration wastewater in a WWTP in Guangdong Province.The problem of nitrogen and phosphorus removal from low-concentration wastewater was solved by increasing influent rate,adding phosphorus removal chemicals,supplementing carbon source and so on.
Carbon fibers
Carbon source
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INTRODUCTION. PRINCIPLES OF BIOLOGICAL AND PHYSICAL/CHEMICAL NITROGEN REMOVAL. SOURCES OF NITROGEN IN WASTEWATER. NITROGEN TRANSFORMATIONS IN BIOLOGICAL TREATMENT PROCESSES. OVERVIEW OF AVAILABLE NITROGEN REMOVAL OPTIONS. Nitrogen Removal by Assimilation. Nitrification. Denitrification. Combined Nitrification/Denitrification. Summary of Design Procedure for Biological Nitrification-Denitrification. Denitrification in Fixed Film Reactors. Nitrification in Fixed Film Reactors. PROCESS SELECTION. PHYSICAL/CHEMICAL PROCESSES FOR NITROGEN REMOVAL. Breakpoint Chlorination. Air Stripping of Ammonia. Selective Ion Exchange. DESIGN AND OPERATION OF BIOLOGICAL NITROGEN REMOVAL FACILITIES. PROCESS OPTIONS. Nitrification Options. Denitrification Options. PROCESS SELECTION. Performance. Process Stoichiometry. Operation and Maintenance. Cost. Summary. SYSTEM DESIGN-SINGLE-SLUDGE SYSTEMS. Process Design. Facilities Design. Facilities Costs. SYSTEM OPERATION. Operational Characteristics. Operational Cost Considerations. FULL-SCALE EXPERIENCE. General. Case Studies. PRINCIPLES OF CHEMICAL PHOSPHATE REMOVAL. SOURCES OF PHOSPHORUS IN WASTEWATER. OVERVIEW OF AVAILABLE CHEMICAL PHOSPHATE REMOVAL OPTIONS. Lime. Iron and Aluminum. SLUDGE PRODUCTION. SUMMARY. DESIGN AND OPERATION OF CHEMICAL PHOSPHORUS REMOVAL FACILITIES. PROCESS OPTIONS. Chemical Selection. Dose Points. PROCESS SELECTION. Selection Factors. Chemical Comparison. SYSTEM DESIGN. Process Design. Facility Design. SLUDGE HANDLING IMPACTS. Solids Generation. Clarification. Thickening and Dewatering. Digestion. Effluent Phosphorus Limitation. Ultimate Disposal. Cost. SYSTEM OPERATION. Process Control. Operating Costs. FULL-SCALE EXPERIENCE. General. Case Studies. PRINCIPLES OF BIOLOGICAL PHOSPHORUS REMOVAL. HISTORICAL BACKGROUND. BIOLOGICAL PHOSPHORUS REMOVAL MECHANISMS. Fate of Substrate in the Anaerobic Zone. Phosphorus Storing Microorganisms. Summary of Biological Phosphorus Removal Mechanism. BIOLOGICAL PHOSPHORUS REMOVAL SYSTEMS. FACTORS AFFECTING BIOLOGICAL PHOSPHORUS REMOVAL PERFORMANCE. Environmental Factors. Design Parameters. Substrate Availability. Phosphorus Removal Versus VFA Production. IMPROVING BIOLOGICAL PHOSPHORUS REMOVAL. DESIGN AND OPERATION OF BIOLOGICAL PHOSPHORUS REMOVAL FACILITIES. PROCESS OPTIONS. Phosphorus Removal Only. Combined Phosphorus/Nitrogen Removal. Sludge Fermentation. SELECTION FACTORS. Wastewater Characteristics. Nitrogen Removal Considerations. Summary. SYSTEM DESIGN. Process Design. Facility Design. Facilities Costs. SYSTEM OPERATION. Operational Considerations. Operational Cost Considerations. FULL-SCALE EXPERIENCE. General. Case Studies. CASE STUDIES IN BIOLOGICAL PHOSPHORUS REMOVAL. INTRODUCTION. Primary and Secondary Releases of Phosphorus. Role of Different Short-Chain Carbohydrates. External Production of Volatile Fatty Acids. OPERATING EXPERIENCES AND CASE STUDIES. Goudkoppies, Johannesburg. Northern Works, Johannesburg. Bulawayo, Zimbabwe. Kelowna, British Columbia. Secunda, Transvaal. Randfontein. Disney World, Florida. Tembisa, Transvaal. Summary of Plant Experiences. SPECIAL CONSIDERATIONS IN OPERATING FOR PHOSPHORUS REMOVAL. Sludge Age or SRT Control. Dissolved Oxygen (DO) Control. Scum Control. Level of Operator Skill. Control of Nitrogen. Redox Control of the Anaerobic Basin. Control and Monitoring of the Acid Generator. Chemical Back-up Requirements. High Level Phosphorus Removal. COST IMPLICATIONS. INDEX.
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The capacity expansion revamping of Shenhua Zhunneng Wastewater Treatment Plant uses the technology of cyclic activated sludge process and supplemental chemical phosphorus removal process,with the design capacity 20,000t/d.After the one year stable operation of this engineering,wastewater treatment work well and the removal rate of COD,BOD5,ammonia nitrogen and total phosphorus achieves 94.7%,96.24%,98.1% and 81.5% separately,which meet the I-A wastewater discharge standards of China(GB18918-2002).Significant social and economic effective is made at the time with annual removal COD 2180t,water reuse 3,500,000 and decrease wastewater treatment cost to 1.125 RMB/t.
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A2/O process was improved and successfully applied in treatment of municipal sewage.The system operates stably,flexibly and reliably.The effluent quality meets the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).The excellent economic and social benefits are achieved.
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The existing facilities were used to reconstruct Xiaoshan Municipal Sewage Treatment Plant.A/A/O process was used,and aeration tank and aerated grit chamber were newly built.After the upgrading reconstruction,nitrogen and phosphorus removal functions are possessed,and the effluent quality meets the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).The treatment process of reconstruction project,reconstruction measures and operation situation are introduced to provide a reference for the upgrading reconstruction of sewage treatment plants currently using conventional processes.
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In order to be in compliance with the discharge requirement of total phosphorus in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002),and to facilitate the operation and management,the chemical phosphorus removal facilities of Liede Wastewater Treatment Plant were reconstructed in whole.A new facility for dosing liquid aluminum sulfate was constructed,the addition points were redesigned,and both modes of manual control and PLC automatic control were used in control system.The effluent TP after the reconstruction can steadily reach Ⅰ-B criteria specified in GB 18918-2002,but the sludge production is obviously increased.
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Because the original design of a wastewater treatment plant of Heshan City had flaws,the effluent nitrogen and phosphorus were not able to reach the discharge standard.In order to meet the discharge standard,under the condition of not adding new structure,the original wastewater treatment process was reconstructed into A2/O process by adding a mixed-liquor return system,improving the sludge recycle system,and ameliorating the sludge treatment processes.The effluent quality after reconstruction can steadily achieve the discharge standard.
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This thesis analyzes and introduces the chemical phosphorus removal principles in the upgrading reform of urban wastewater treatment and the cost,points out that chemical agent through chemical reaction with the phosphorus of the sewage can form insoluble phosphate,which can be removed through precipitation,filtration and other methods.The higher is the concentration of phosphorus in waste water,the higher is the utilization of chemical agents,and vice versa.Lower effluent phosphorus concentration requirements,the removal units are higher doses of phosphorus.
Filtration (mathematics)
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