Wastewater sludge treatment method

Abstract

The invention discloses a wastewater sludge treatment method. According to the method, wastewater sludge is firstly dehydrated to form pretreated sludge with water content of 88%-90%; secondly, iron chloride is added and uniformly mixed with the pretreated sludge; thirdly, a calcium hydrate solution is used to adjust pH value of the pretreated sludge; fourthly, fly ash is added and uniformly mixed with the pretreated sludge; and finally, pressing is carried out by the use of a filter press so as to form clods, water content of which is less than or equal to 50%. In comparison with the prior art, the invention starts with wall-breaking modification and machinery filter-press matching. By addition of a medicament, sludge surface is activated and modified to change properties of water in sludge and convert bound water to free water; and finally, pressing is carried out by the use of the filter press to form clods. Thus, it is convenient for subsequent treatment of sludge.

Description

technical field

[0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for sludge produced in wastewater treatment. Background technique

[0002] The waste water sludge described in the present invention is the sludge produced by the treatment of industrial waste water and domestic waste water. After the waste water sludge is further treated, it can be used as a resource. For example, the paper-making sludge contains fine fibers, lignin and Some organic substances can be used as raw materials for making organic fertilizers after dehydration treatment; urban domestic wastewater sludge contains a certain amount of organic substances, as well as inorganic components such as SiO2, Al2O3, CaO, etc., which can be used as building materials. Under normal circumstances, the water content of wastewater sludge is still very high after modification, compression, concentration, etc., and it is difficult to press into agglomerates, wh...

Examples

Embodiment 1

[0016] Embodiment 1——The treatment of the sludge with a moisture content of 97% produced by industrial wastewater treatment

[0017] First, 97% of the waste water sludge is mechanically dehydrated to a pretreated sludge with a water content of 88%; then, adding ferric chloride accounting for 0.75% of the weight of the pretreated sludge in the pretreated sludge, mixing uniform; then use calcium hydroxide solution to adjust the pH value of the pretreated sludge to 6.5; then add 0.45% of the weight of the pretreated sludge fly ash, mix evenly; finally use a filter press to press into a water-containing Mud with a rate of ≤50%.

Embodiment 2

[0018] Embodiment 2——The treatment of sludge with a water content of 97% produced by domestic wastewater treatment

[0019] First, the waste water sludge with a moisture content of 97% is mechanically dehydrated to a pretreated sludge with a moisture content of 88%; then 1.25% of the weight of the pretreated sludge is added to the pretreated sludge Iron, mix well; then use calcium hydroxide solution to adjust the pH value of the pretreatment sludge to 6.5; then add 0.75% of the weight of the pretreatment sludge fly ash, mix well; finally use a filter press Pressed into mud blocks with a moisture content of ≤50%.

Embodiment 3

[0020] Embodiment 3 - the treatment of sludge with a water content of 98% produced by industrial wastewater treatment

[0021] Firstly, the waste water sludge with a water content of 98% is mechanically dehydrated to a pretreated sludge with a water content of 89%; then, 1.25% of the weight of the pretreated sludge is added to the pretreated sludge. , mix uniformly; then use calcium hydroxide solution to adjust the pH value of the pretreated sludge to 7.0; then add 0.85% of the weight of the pretreated sludge fly ash, mix uniformly; finally use a filter press to suppress into mud with a moisture content of ≤50%.

technical field

[0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for sludge produced in wastewater treatment. Background technique

[0002] The waste water sludge described in the present invention is the sludge produced by the treatment of industrial waste water and domestic waste water. After the waste water sludge is further treated, it can be used as a resource. For example, the paper-making sludge contains fine fibers, lignin and Some organic substances can be used as raw materials for making organic fertilizers after dehydration treatment; urban domestic wastewater sludge contains a certain amount of organic substances, as well as inorganic components such as SiO2, Al2O3, CaO, etc., which can be used as building materials. Under normal circumstances, the water content of wastewater sludge is still very high after modification, compression, concentration, etc., and it is difficult to press into agglomerates, wh...

Examples

Embodiment 1

[0016] Embodiment 1——The treatment of the sludge with a moisture content of 97% produced by industrial wastewater treatment

[0017] First, 97% of the waste water sludge is mechanically dehydrated to a pretreated sludge with a water content of 88%; then, adding ferric chloride accounting for 0.75% of the weight of the pretreated sludge in the pretreated sludge, mixing uniform; then use calcium hydroxide solution to adjust the pH value of the pretreated sludge to 6.5; then add 0.45% of the weight of the pretreated sludge fly ash, mix evenly; finally use a filter press to press into a water-containing Mud with a rate of ≤50%.

Embodiment 2

[0018] Embodiment 2——The treatment of sludge with a water content of 97% produced by domestic wastewater treatment

[0019] First, the waste water sludge with a moisture content of 97% is mechanically dehydrated to a pretreated sludge with a moisture content of 88%; then 1.25% of the weight of the pretreated sludge is added to the pretreated sludge Iron, mix well; then use calcium hydroxide solution to adjust the pH value of the pretreatment sludge to 6.5; then add 0.75% of the weight of the pretreatment sludge fly ash, mix well; finally use a filter press Pressed into mud blocks with a moisture content of ≤50%.

Embodiment 3

[0020] Embodiment 3 - the treatment of sludge with a water content of 98% produced by industrial wastewater treatment

[0021] Firstly, the waste water sludge with a water content of 98% is mechanically dehydrated to a pretreated sludge with a water content of 89%; then, 1.25% of the weight of the pretreated sludge is added to the pretreated sludge. , mix uniformly; then use calcium hydroxide solution to adjust the pH value of the pretreated sludge to 7.0; then add 0.85% of the weight of the pretreated sludge fly ash, mix uniformly; finally use a filter press to suppress into mud with a moisture content of ≤50%.