Method for efficient in-situ reduction treatment of sludge

Abstract

The invention relates to a method for high-efficiency in-situ reduction treatment of sludge, which comprises the following steps: S1, pumping a sludge mixed solution in a sludge concentration tank into a self-suction internal circulation reaction kettle, adding NaOH and hydrogen peroxide into the self-suction internal circulation reaction kettle, continuously introducing ozone into the self-suction internal circulation reaction kettle, carrying out wall breaking and hydrolysis on the sludge under the action of a plurality of medicaments, and dissolving microbial components into a liquid phase; and pumping the mixed solution into a centrifugal separator for solid-liquid separation to obtain sludge. Compared with the prior art, efficient reduction of the sludge can be realized through a cheap agent and an efficient reactor, the overall operation cost is low, and the application prospect is wide.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a method for efficient in-situ sludge reduction treatment. Background Art

[0002] Most traditional sewage treatment processes are based on cheap biological methods, which produce a large amount of sludge as a by-product. Sludge contains a large number of microorganisms, has a high water content, and has high environmental risks. Since my country's sludge treatment and disposal started late, sludge production has increased year by year, and the requirements for pollution reduction and carbon reduction, as well as synergistic efficiency have continued to increase, the problem of sludge treatment needs to be solved urgently. Traditional sludge disposal methods mainly include landfill, composting, drying, incineration, and cement kiln coordination. These methods have some drawbacks or constraints, and it is difficult to meet the overall requirements of sludge treatment. The treatment and disposal of sludge should be considered comprehensively from multiple aspects such as environmental pollution, health and safety, and economic benefits. The difficulty in sludge treatment is that the water content after dehydration is still as high as about 80%, so the amount is huge, and better sludge reduction technology is needed.

[0003] The technical problem to be solved by the present invention is that, with respect to the sludge reduction technology in the prior art, the wall breaking and hydrolysis of microorganisms in the sludge are achieved by adding cheap agents, the dewatering performance of the sludge solids is greatly improved, and the sludge amount is greatly reduced through efficient centrifugal separation treatment. Summary of the invention

[0004] The purpose of the present invention is to provide a method for efficient in-situ sludge reduction treatment in order to solve the above problems. The method is characterized in that the sludge mixed liquid in the concentrated sludge tank is pumped into a self-priming internal circulation reactor, NaOH and hydrogen peroxide are added thereto, and ozone is continuously introduced. Under the action of various agents, the sludge wall is broken and hydrolyzed, and the microbial components are dissolved into the liquid phase; the mixed liquid is pumped into a centrifuge for solid-liquid separation to obtain sludge residue. In general, by adding specific agents and using a specific treatment device, namely a self-priming internal circulation reactor, the purpose of efficient in-situ sludge reduction is achieved.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A method for efficient in-situ sludge reduction treatment, characterized in that the method specifically comprises the following steps:

[0007] S1: The sludge mixture in the concentrated sludge tank is pumped into the reactor, NaOH and hydrogen peroxide are added, and ozone is continuously introduced. Under the action of various agents, the sludge wall is broken and hydrolyzed, and the microbial components are dissolved into the liquid phase;

[0008] S2: The mixed liquid is pumped into a centrifuge for solid-liquid separation to obtain sludge.

[0009] Preferably, the reactor described in step S1 is a closed self-priming internal circulation reactor, and the self-priming paddle stirring speed is 300-600r / min.

[0010] Preferably, the sludge mixed liquor in the concentrated sludge tank in step S1 has a water content of 95-98%.

[0011] Preferably, the amount of ozone introduced in step S1 is 10-20 kg / t of the weight of the sludge mixed liquid.

[0012] Preferably, the amount of NaOH added in step S1 is 0.1-0.2% of the total weight of the sludge mixture.

[0013] Preferably, the concentration of hydrogen peroxide in step S1 is a commercially available 30% H2O2 solution, and the added amount is 0.5-1.0% of the total weight of the sludge mixed solution.

[0014] The present invention pumps the sludge mixed liquid in the concentrated sludge tank into the reactor, adds NaOH and hydrogen peroxide, and continuously introduces ozone. Under the action of multiple agents, the sludge wall is broken and hydrolyzed, and the microbial components are dissolved into the liquid phase; the mixed liquid is pumped into a centrifuge for solid-liquid separation to obtain sludge. In general, the sludge in the concentrated tank is directly treated without the need for a dehydration process. The moisture content of the sludge produced after centrifugal solid-liquid separation can reach less than 40%, and the overall sludge reduction can reach more than 80% compared with the dehydrated sludge (calculated at a moisture content of 80%).

[0015] Compared with the prior art, the present invention has the following beneficial effects: Compared with the prior art, the present invention can achieve efficient utilization of ozone by adding cheap and readily available agents and through an efficient self-priming reactor, thereby achieving efficient wall breaking of sludge microorganisms, and finally achieving efficient mud-water separation, obtaining sludge with a lower water content, and achieving a substantial reduction in sludge. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to specific embodiments, but this is by no means a limitation of the present invention.

[0017] Example 1

[0018] A pharmaceutical sludge in-situ reduction treatment technology

[0019] The pharmaceutical sludge mixed liquid in the concentrated sludge pool with a moisture content of about 96% is pumped into a self-priming internal circulation reactor, and NaOH and hydrogen peroxide are added thereto, and ozone is continuously introduced, the ozone introduction amount is 10-20kg / t of the weight of the sludge mixed liquid, the self-priming paddle stirring speed is 300-600r / min, the hydrogen peroxide concentration is a commercially available 30% concentration H2O2 solution, the addition amount is 0.5-1.0% of the total weight of the sludge mixed liquid, the NaOH addition amount is 0.1-0.2% of the total weight of the sludge mixed liquid, the reaction time is 30-120min, and the sludge wall is broken and hydrolyzed under the action of multiple agents, and the microbial components are dissolved in the liquid phase; the mixed liquid is pumped into a centrifuge for solid-liquid separation to obtain sludge. It can achieve efficient mud-water separation, and the moisture content of the mud residue can be less than 40%. Compared with dewatered sludge (calculated at a moisture content of 80%), the overall sludge reduction can reach more than 80%, achieving a significant reduction in sludge, and has broad application prospects.

[0020] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A method for efficient in-situ sludge reduction treatment, characterized in that: The method specifically comprises the following steps: S1: The sludge mixture in the concentrated sludge tank is pumped into the reactor, NaOH and hydrogen peroxide are added, and ozone is continuously introduced. Under the action of various agents, the sludge wall is broken and hydrolyzed, and the microbial components are dissolved into the liquid phase; S2: The mixed liquid is pumped into a centrifuge for solid-liquid separation to obtain sludge.

2. The method for efficient in-situ sludge reduction treatment according to claim 1, characterized in that: The reactor is a closed self-priming internal circulation reactor, and the self-priming paddle stirring speed is 300-600r / min.

3. The method for efficient in-situ sludge reduction treatment according to claim 1, characterized in that: The water content of the sludge mixed liquid in the concentrated sludge tank is 95-98%.

4. The method for efficient in-situ sludge reduction treatment according to claim 1, characterized in that: The amount of ozone introduced is 10-20 kg / t of the weight of the sludge mixed liquid.

5. The method for efficient in-situ sludge reduction treatment according to claim 1, characterized in that: The amount of NaOH added is 0.1-0.2% of the total weight of the sludge mixed liquid.

6. The method for efficient in-situ sludge reduction treatment according to claim 1, characterized in that: The concentration of the hydrogen peroxide is a commercially available 30% H2O2 solution, and the added amount is 0.5-1.0% of the total weight of the sludge mixed liquid.