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A method for deep dephosphorization of sewage while improving the dewatering performance of sedimentation sludge

A technology for sludge dewatering and sewage treatment, which is applied in the fields of dewatering/drying/concentrating sludge treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of high chemical cost, poor sludge dewatering performance, and high sludge disposal cost.

Inactive Publication Date: 2017-05-31
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional chemical phosphorus removal process has the following disadvantages: 1. Compared with the biological phosphorus removal that hardly adds chemicals, the cost of chemicals is high
2. The sludge output is significantly larger than other phosphorus removal processes, and the cost of sludge disposal is high
3. Poor dewatering performance of generated sludge
[0005] However, in the current sewage treatment process patents or literature, sewage phosphorus removal and sludge dehydration are carried out separately, and chemical agents need to be added to both steps, and sludge disposal is required.

Method used

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  • A method for deep dephosphorization of sewage while improving the dewatering performance of sedimentation sludge

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Effect test

Embodiment 1

[0016] The beaker test was used to carry out the coagulation test, and 7mg of polyferric sulfate (with an effective Fe content of 11.2%) was weighed and added to 1L of sewage (the sewage was taken from the biochemical tail water of urban sewage treatment plants, and the total phosphorus concentration was 4mg / L). After stirring and reacting for 30 minutes, and then settling for 10 minutes to settle, take a water sample 2~3cm below the liquid surface to measure TP, the total phosphorus concentration drops to 0.4mg / L, and filter to obtain phosphorus-containing sludge; add to the above-mentioned phosphorus-containing sludge Sulfuric acid (mass fraction 70%) was activated, and the pH was adjusted to 5.6; the obtained activated phosphorus-containing sludge and 5 mg cationic polymer organic flocculant (cation concentration 40%) were added to the sludge conditioning test beaker at the same time , add 500mL sludge into the beaker, stir and react for 10min to obtain modified sludge; mech...

Embodiment 2

[0018] Coagulation test was carried out by beaker test, and 8 mg of polyaluminum chloride (including Al 2 o 3 The mass fraction is 10%), added to 1L of sewage (the sewage is taken from the biochemical tail water of the urban sewage treatment plant, the total phosphorus concentration is 1.8mg / L), after stirring and reacting for 30 minutes, and then standing for 10 minutes to settle, Take a water sample 2~3cm below the liquid surface to measure TP, the total phosphorus concentration is reduced to 0.3mg / L, filter the phosphorus-containing sludge; add pickling waste acid to the above-mentioned phosphorus-containing sludge for activation, and adjust the pH to 5.6; Activated phosphorus-containing sludge and 6 mg of cationic polymer organic flocculant (cation concentration: 50%) were simultaneously added to the beaker of the sludge conditioning test, and 500 mL of sludge was added to the beaker, stirred and reacted for 30 minutes to obtain modified sludge; The above modified sludge ...

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Abstract

The invention relates to a method for deep dephosphorization of sewage and simultaneously improving dehydration property of settling sludge. The method comprises the following steps: 1) adding a ferric salt or aluminium salt coagulant into sewage, stirring and reacting the sewage to react for 20-30 minutes, and then carrying out static settlement and solid-liquid separation, wherein the total phosphorus concentration in supernate is reduced to 0.5 mg / L and sludge containing phosphorus is obtained; 2) adding an acidity adjustor into the sludge containing phosphorus to activate the sludge; 3) simultaneously adding the activated sludge containing phosphorus and a positive ion macromolecular organic flocculant into a sludge tempering pond, and stirring the sludge to react for 10-30 minutes to obtain modified sludge; and 4) mechanically dehydrating the modified sludge to obtain dry sludge with the water content of 40-50%. According to the method provided by the invention, sewage phosphorus removal and sewage dehydration are simultaneously completed, so that sludge generated in a phosphorus removal process is used as a resource, the process flow is simplified, and the method is economical and efficient.

Description

technical field [0001] The invention relates to a method for deep dephosphorization of sewage while improving the dewatering performance of sedimentation sludge, belonging to the field of sewage treatment and sludge disposal. Background technique [0002] In static or slow-flowing water, if the concentration of phosphorus is too high, it will cause eutrophication of the water body, and reducing the phosphorus content in urban sewage is one of the main ways to prevent water eutrophication. Phosphorus removal methods mainly include physical, chemical, and biological methods. Chemical phosphorus removal is accomplished through chemical precipitation. This process is to add inorganic metal salts such as iron salts, aluminum salts, etc. Salt forms a granular, insoluble mass. The traditional chemical phosphorus removal process has the following disadvantages: 1. Compared with the biological phosphorus removal that hardly adds chemical agents, the cost of chemicals is high. 2. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F11/14C02F11/12
Inventor 陆永生杨兴兴徐璐刘晶晶夏薇张家泉钱光人
Owner SHANGHAI UNIV