CN104341083A - Pharmaceutical sludge reduction treatment method - Google Patents

Abstract

The invention discloses a method for reducing the amount of pharmaceutical sludge, which comprises the following steps: step 1), after gravity concentration of the remaining pharmaceutical sludge from a pharmaceutical sewage treatment plant, transporting it to a sludge storage tank through a sludge inlet pipe, Stir evenly in the mud tank by a mixer; step 2), the evenly stirred sludge in the mud storage tank is transported to the ozone oxidation reactor by a peristaltic pump for ozone oxidation treatment; the ozone oxidation reactor includes an ozone generator, an ozone contact column, and a tail gas collection device, the gas source of the ozone generator is air, the ozone concentration generated is 10-33mg/L, the amount of ozone added is 50-100mgO ₃ /g TS, the reaction pH is 5.0-8.0, and the reaction temperature is room temperature 20-25°C Step 3 ), the step 2) the pharmaceutical sludge after ozone oxidation is sent into the anoxic stirring tank for stirring; step 4), the sludge stirred through the anoxic is sent into the anaerobic digestion reactor for mesophilic anaerobic digestion; mesophilic anaerobic digestion The temperature in the oxygen digestion reactor is 33-37° C., the reaction pH is 6.5-7.5, and the reaction time is 10-15 days.

Description

A method for reducing the amount of pharmaceutical sludge

technical field

The invention relates to the technical field of solid waste treatment and resource utilization in the pharmaceutical industry, in particular to a treatment method for reducing the amount of pharmaceutical sludge, specifically, to a method for pretreating pharmaceutical sludge by using ozone oxidation technology, which is stirred by anoxic After that, anaerobic digestion is carried out to finally realize the method of reducing the amount of pharmaceutical sludge. the

Background technique

With the development of the pharmaceutical industry, pharmaceutical wastewater has become one of the important sources of pollution. Pharmaceutical wastewater is mostly treated with biological treatment methods such as activated sludge method, and a large amount of excess sludge is generated during the treatment process. The composition of pharmaceutical sludge is complex, containing a large amount of raw materials and intermediates, heavy metals and salts, and a small amount of pathogenic microorganisms remaining in the pharmaceutical process. At present, most of the treatment of pharmaceutical sludge in our country is landfilled as hazardous waste. the

Anaerobic digestion is a sludge disposal method commonly used in the world at present. This method has the advantages of killing bacteria, reducing sludge volume, and promoting the final stabilization of sludge. At the same time, it generates biogas, recovers energy, and reduces energy consumption. However, the research and development of this technology at home and abroad is mainly focused on the treatment of municipal sludge. Pharmaceutical sludge contains a large amount of organic matter. Anaerobic digestion of pharmaceutical sludge can effectively reduce the volume of sludge and realize the resource utilization of pharmaceutical sludge. the

However, the period of anaerobic digestion of pharmaceutical sludge is long, the utilization efficiency of sludge is low, and the amount of biogas produced is small, which limits the application of pharmaceutical sludge digestion technology to a certain extent. Therefore, it is necessary to use a certain pretreatment method to destroy the microbial cell wall and cell membrane in the sludge, so as to release the organic matter in the cells, so as to accelerate the anaerobic digestion and hydrolysis process rate of the pharmaceutical sludge, increase the gas production of the sludge, and shorten the anaerobic digestion time of the sludge. , improve digestion efficiency. the

Ozone, as a strong oxidant, can effectively destroy biological cell walls and release intracellular substances, which can be used as a pretreatment technology for anaerobic digestion. In the prior art, in the Chinese patent "A Method for Ozone-Promoted Sludge Reduction (Patent No. 200910234690.6)", a sludge treatment technology of ozone oxidation pretreatment combined with anaerobic digestion was developed for municipal sludge. However, a large amount of oxidizing substances such as ozone molecules remain in the sludge oxidized by ozone, so it is not suitable to directly enter the anaerobic digestion reactor. the

Contents of the invention

The present invention proposes a treatment method for the reduction of pharmaceutical sludge in view of the problems existing in the current situation of the above-mentioned existing pharmaceutical sludge treatment. This method can effectively reduce the volume of sludge, promote the stability and reduction of pharmaceutical sludge, and make anaerobic The digestion efficiency is maximized, and the biogas generated by anaerobic digestion is collected and utilized at the same time, which has a good resource utilization effect. the

In order to solve the technical problems proposed by the present invention, the technical solution provided by the present invention is: a method for reducing the amount of pharmaceutical sludge, comprising the following steps:

Step 1), after the gravity concentration of the remaining pharmaceutical sludge from the pharmaceutical sewage treatment plant, it is transported to the sludge storage tank through the sludge inlet pipe, and stirred evenly by a mixer in the sludge storage tank;

Step 2), the uniformly stirred sludge in the mud storage tank is transported to the ozone oxidation reactor by a peristaltic pump for ozone oxidation treatment; the ozone oxidation reactor includes an ozone generator, an ozone contact column, and a tail gas collection device, and the gas source of the ozone generator is Air, the concentration of ozone produced is 10-33mg/L, the ozone enters the bottom of the ozone contact column through the titanium alloy aeration pan, and oxidizes with the pharmaceutical sludge, the amount of ozone added is 50-100mgO ₃ /g TS, and the reaction pH is 5.0 ～8.0, the reaction temperature is room temperature 20～25℃

Step 3), the pharmaceutical sludge after step 2) is sent to the anoxic stirring tank through ozonation for stirring;

Step 4), the sludge stirred by hypoxia is sent to the anaerobic digestion reactor for mesophilic anaerobic digestion; the temperature inside the mesophilic anaerobic digestion reactor is 33-37°C, the reaction pH is 6.5-7.5, and the reaction time is 10-20°C. 15 days; the biogas produced by anaerobic digestion is collected by a gas collection device, and the methane content is measured. the

Preferably, the pharmaceutical surplus sludge in step 1) passes through a 2mm screen before entering the sludge storage tank to remove large particles. the

A further preferred technical solution is that an on-line monitor is provided in the anoxic stirred tank in the step 4) to monitor the sludge pH, DO, ORP, and adjust the sludge pH, DO, ORP according to the monitored values, so that the sludge The mud reaches the state most suitable for anaerobic digestion. the

The beneficial effects of the present invention include: after the pharmaceutical sludge is pretreated by ozone oxidation, anoxic stirring, and anaerobic digestion, the sludge is effectively reduced, the TCOD removal rate is 65-80%, the VS removal rate is 40-59%, The sedimentation performance and dewatering performance of the sludge are improved. The invention has strong universality for the reduction treatment of pharmaceutical excess sludge, can be used for the treatment of various pharmaceutical process excess sludge, and has wide application prospects. the

Ozone is used for pretreatment of pharmaceutical sludge, which can shorten the process of anaerobic digestion and hydrolysis, and adjust the sludge to the most suitable state for anaerobic digestion through anoxic stirring, which can maximize the anaerobic digestion efficiency of sludge. Ozone oxidation-deficiency The volume of pharmaceutical sludge after aerobic stirring-anaerobic digestion is greatly reduced, which saves the subsequent disposal cost of sludge, and the methane gas obtained can be utilized, which has good economic benefits. the

Description of drawings

Fig. 1 is the processing flow equipment schematic diagram of the present invention;

In the figure, 1 is the mud inlet pipe, 2 is the mud storage tank, 3 is the mixer for the mud storage tank, 4 is the ozone generator, 5 is the ozone contact column, 6 is the tail gas collection device, 7 is the anoxic stirring tank, and 8 is the anoxic tank. Oxygen stirring tank mixer, 9 is an online monitor, 10 is an anaerobic digestion reactor, 11 is a biogas collection device, and 12 is a sludge discharge pipe. the

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. the

The invention utilizes the combination technology of ozone oxidation-anoxic stirring-anaerobic digestion to realize the reduction of pharmaceutical sludge. After the residual sludge of the pharmaceutical sewage treatment plant is concentrated by gravity and filtered through a 2mm screen to remove large particles, The pipe 1 enters the mud storage tank 2, and is evenly stirred by the mud storage tank mixer 3; the pharmaceutical sludge enters the ozone contact column 5 through a peristaltic pump, and the ozone contact column is provided with ozone concentration of 10-33mg/L by the ozone generator 4, and the generated The tail gas is collected and processed by the tail gas collection device 6 and discharged to the atmosphere. The ratio of the amount of ozone added to the total solids of the sludge is 100 mgO ₃ /g TS; Under the action of stirring, the foam generated in the ozone reactor is eliminated, the residual ozone molecules are eliminated, and the oxidation-reduction potential of the sludge is reduced. An online monitor 9 is installed in the stirring tank to monitor the sludge pH, DO, and ORP, and adjust according to the monitored values. The sludge reaches the most suitable state for anaerobic digestion; the sludge in the anoxic stirred tank is sent to the anaerobic digestion reactor 10 for mesophilic anaerobic digestion, the temperature of the reactor is 33-37°C, the reaction pH is 6.5-7.5 The biogas produced by digestion is collected by the biogas collection device 11, and the methane content in it is measured, and the reacted sludge is discharged through the sludge discharge pipe 12.

Example 1:

The remaining sludge of a chemical synthesis comprehensive pharmaceutical wastewater treatment plant, the properties of the sludge after gravity concentration are as follows: 

The pharmaceutical sludge in the mud storage tank 2 is sent to the ozone contact column 5, the ozone generated by the ozone generator 4 enters the ozone contact column 2 from the bottom, and the tail gas is collected and processed by the tail gas collection device 6 and then discharged to the atmosphere. The ratio of ozone addition to sludge total solids was 100mgO ₃ /g TS. After ozone oxidation, the soluble COD in the sludge became 2549.3mg/L, the soluble COD increased by 4.6 times, and the TS of pharmaceutical sludge decreased by 17.5%. After pretreatment, the pharmaceutical sludge is sent to the anoxic stirring tank 7 for stirring, the oxidation-reduction potential ORP of the sludge is reduced from 319mV to 0mV, and the pH value of the sludge is 6.89. The pharmaceutical sludge after anaerobic stirring enters the anaerobic digestion reactor 10, and the gas generated by digestion is collected by the biogas collection device 11, and the methane content is measured; the anaerobic digestion temperature is 35±1°C, and the inoculated sludge is a municipal sewage treatment Plant anaerobic digestion sludge. After being treated by ozone oxidation-anoxic stirring-anaerobic digestion process, the TCOD removal rate of the pharmaceutical sludge reached 69.5%, and the VS volume reduction was 42.4%.

Example 2:

The properties of the remaining sludge in the comprehensive sewage treatment plant of an antibiotic pharmaceutical factory after gravity concentration are as follows: 

The pharmaceutical sludge in the mud storage tank 2 is sent to the ozone contact column 5, the ozone generated by the ozone generator 4 enters the ozone contact column 2 from the bottom, and the tail gas is collected and processed by the tail gas collection device 6 and then discharged to the atmosphere. The ratio of ozone addition to sludge total solids was 100mgO ₃ /g TS. After ozone oxidation, the soluble COD in the sludge became 7793.4mg/L, the soluble COD increased by 12.4 times, and the sludge TS decreased by 60.4%. After pretreatment, the pharmaceutical sludge is sent to the anoxic stirring tank 7 for stirring, the oxidation-reduction potential ORP of the sludge is reduced from 237mV to 0mV, and the pH value of the sludge is 6.64. The pharmaceutical sludge after anaerobic stirring enters the anaerobic digestion reactor 10, and the gas generated by digestion is collected by the biogas collection device 11, and the methane content is measured; the anaerobic digestion temperature is 35±1°C, and the inoculated sludge is a municipal sewage treatment Plant anaerobic digestion sludge. After being treated by ozone oxidation-anoxic stirring-anaerobic digestion process, the TCOD removal rate of the pharmaceutical sludge is 79.8%, and the VS volume reduction is 59.3%.

Claims (3)

1. a pharmacy sludge reduction treatment process, is characterized in that, comprises the following steps:

Step 1), after pharmacy sewage treatment plant residue pharmacy mud is carried out gravity concentration, being delivered in storage basin through entering mud pipe, being stirred by stirrer in storage basin;

Step 2), the mud that storage basin stirs is delivered in ozone oxidation reaction device by peristaltic pump and carries out ozone Oxidation Treatment; Ozone oxidation reaction device comprises ozonizer, ozone contact post, tail gas collecting device, ozonizer source of the gas is air, the ozone concn produced is 10 ~ 33mg/L, ozone enters ozone contact column bottom by titanium alloy aeration plate, with pharmacy mud generation oxygenizement, ozone dosage is 50 ~ 100mgO ₃/ g TS, reaction pH5.0 ~ 8.0, temperature of reaction is normal temperature 20 ~ 25 DEG C;

Step 3), by step 2) pharmacy mud after ozone oxidation sends into anoxia stirring pond and stirs;

Step 4), send into anaerobic digestion reaction vessel through the mud of anoxia stirring, carry out anaeration in normal temperature

Digestion; Mesophilic anaerobic digestion reactor temperature is 33 ~ 37 DEG C, and reaction pH is 6.5 ~ 7.5,10 ~ 15 days reaction times; The biogas that anaerobic digestion produces is collected through gas collector, and measures methane content.

2. a kind of pharmacy sludge reduction treatment process according to claim 1, is characterized in that, described step 1) in pharmacy excess sludge enter through 2mm screen cloth before storage basin, remove large particulate matter.

3. a kind of pharmacy sludge reduction treatment process according to claim 1, it is characterized in that, described step 4) in anoxia stirring pond in be provided with on-line computing model, monitoring sludge pH, DO, ORP, according to monitoring numerical value, sludge pH, DO, ORP are regulated, make mud reach the state of optimum anaerobic digestion.