Improved process for primary treatment of sewage in urban area

A treatment method and technology for urban domestic sewage, applied in the field of improvement of urban sewage intensified primary treatment method, can solve the problems of poor pollutant removal effect, low SS removal rate, large dosage of chemicals, etc., and achieve enhanced primary treatment effect, increase SS removal rate, removal rate and stable effect

Inactive Publication Date: 2002-07-24
江苏宜净物业有限公司
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Problems solved by technology

[0002] Urban sewage treatment, secondary treatment has large investment and high treatment operation cost, so it is subject to certain restrictions
Although the primary treatment has a low investment, it is less effective in removing pollutants, so it is rarely used.
Emerged at the historic moment are various types of low investment, and enhanced primary treatment process with higher efficiency for pollutant removal, such as chemical flocculation enhanced primary treatment process (flocculation - precipitation - effluent), through the sedimentation Pre-dosing chemical flocculants improves the efficiency of sedimentation and separation. The disadvantages are: for dissolved organic pollutants (such as dissolved COD, NH 3 -N) The removal efficiency is very low, and the dosage of the agent is large, usually up to 200-300ppm, and the treatment cost is relatively high
Bioflocculation and adsorption enhanced primary treatment process (reflux sludge - flocculation and adsorption - precipitation - efflu

Method used

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  • Improved process for primary treatment of sewage in urban area
  • Improved process for primary treatment of sewage in urban area

Examples

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Example Embodiment

[0010] Examples: Examples are shown in Table 2 for influent and effluent pollutants and process parameters. The incoming water is mixed with the return sludge and aerated for adsorption and flocculation for 10-30 minutes, and then Al is added. 2 O 3 The liquid PAC with a content of 10% undergoes flocculation reaction for 10-15 minutes, and then the coagulant PAM is added for about 1-3 minutes for natural precipitation. The sedimentation sludge is mechanically stirred for 5-10 minutes to break the floc, and after standing still for 0.5-5 minutes, the upper layer of sludge is taken for activation. Aeration control dissolved oxygen concentration 0.5-3mg / l, activation time 1.5-5 hours, reflux. The remaining sludge is dehydrated and dried. The flocculant adding port is set in the middle area of ​​the flocculation tank (including the middle, near-middle and rear middle), and the coagulant adding port is set in the outlet area of ​​the flocculating tank.

[0011] Table 1 Comparison table...

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Abstract

An improved process of one-stage treatment of city sewage is characterized by that on the basis of biologic-chemical adsorption and flocculation method, the deposited mud is separated and activated by aeration and the activated mud is used for reflux, adsorption and flocculation, so greatly removing COD, ammoniacal nitrogen and SS, and saving chemical flocculant. Its advantages are high effect and low cost.

Description

technical field [0001] The invention relates to urban sewage treatment, in particular to the improvement of a method for strengthening the primary treatment of urban sewage. Background technique [0002] For urban sewage treatment, secondary treatment requires large investment and high operating costs, so it is limited to a certain extent. Although the primary treatment has a low investment, it is less effective in removing pollutants, so it is rarely used. Emerged at the historic moment are various types of low investment, and enhanced primary treatment process with higher efficiency for pollutant removal, such as chemical flocculation enhanced primary treatment process (flocculation - precipitation - effluent), through the sedimentation Pre-dosing chemical flocculants improves the efficiency of sedimentation and separation, and its disadvantages are: for dissolved organic pollutants (such as dissolved COD, NH 3 -N) The removal efficiency is very low, and the dosage of ch...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F3/12
CPCY02W10/10
Inventor 苗勇潘德扣凌坤生
Owner 江苏宜净物业有限公司
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