Sludge anaerobic digester operation and management considerations are?

Sludge anaerobic digester operation and management considerations are:

(1) management of microorganisms

Anaerobic digestion process is carried out in closed anaerobic conditions, microorganisms survive in such conditions can not be as aerobic treatment as indicator organisms of various organisms, relying on the microscope to determine the activity of sludge. Can only be used to respond to the microbial metabolism of the indicators indirectly determine the microbial activity, compared with the activated sludge aerobic treatment system, anaerobic digestion of sludge system on the process conditions and changes in environmental factors, reflecting the more sensitive. In order to grasp the normal operation of the digester, the daily instantaneous monitoring and laboratory indicators required above should be monitored and tested in time, such as temperature, PH, biogas production, mud level, pressure, water content, and components in biogas. Quickly make adjustments as needed to avoid causing big losses.

(2) For the daily operating conditions, treatment measures, equipment operating conditions are required to make a written record, to provide operating data for the next shift, and make a good report to the next level of management, to provide process adjustment data.

(3) Frequent testing and inspection of sludge piping, biogas piping and various valves to prevent clogging, leakage or failure. Daily on the possible blockage of the pipeline set on the movable cleaning port, the use of high-pressure water flushing. For the valve in addition to lubricating grease should be on time, but also should be normally closed gates, normally open gates regular activities, check whether it can work properly. Serious problems also need to be shut down or replaced.

(4) regular inspection pressure, insurance valves, meters, alarm devices, sent to the city's specialized technical supervision department, the national authority to obtain recognition before being installed and used.

(5) Regular inspection and maintenance of the mixing system. Biogas mixing main tube is often blocked by sludge and other dirt, you can turn off the rest of the main tube, use the atmospheric volume to flush and blow the blocked pipe. For the mechanical mixing paddle is cotton yarn and other long debris winding fault can be taken to reverse the mechanical mixer to shake off the winding debris. In addition, to regularly check the mixing shaft and floor intersection of the airtightness.

(6) digester with its piping, valves in winter must pay attention to anti-freezing, in the cold northern regions into the winter before freezing must be checked and repaired before the insulation facilities, such as digester top of the digester biogas pipeline, water seal valve (tank). Doors and windows in the biogas lifting pump room must be intact and not damaged, and it is better to add cotton curtains on the doors, and the wet desulfurization device should be guaranteed to work above 10℃. Especially outdoor biogas piping, hot water piping, steam piping and valves must be well insulated, sunscreen, rain and other work.

(7) regular inspection and maintenance of the heating system, steam heating pipeline, hot water heating pipeline, heat exchanger inside the mud treatment pipeline, etc. may be clogging phenomenon, corrosion phenomenon, generally with a high flow rate flushing. Casing type piping should pay attention to flushing hot water piping to ensure that the pressure in the mud pipe to prevent the inner pipe deflated or disassembled for cleaning.

(8) Digester in addition to the usual strengthening of inspection, but also regularly stop the operation and emptying, inspection and maintenance of the pool, generally about 5 years for a thorough sand and in addition to scum, but also a comprehensive corrosion, seepage control inspection and treatment. Mainly on the metal pipeline, parts of the corrosion, such as serious damage should be replaced, some easy to damage parts of the best for stainless steel materials. The pool wall seepage, anti-corrosion treatment. After maintenance and put into operation before the full water test and air tightness test must be carried out. For the digesting pool for the accumulation of sand and scum condition should be assessed, if serious that the pretreatment is not good. The pretreatment should be improved to prevent sand and scum from entering. In addition after emptying the digester, the pool should be checked for structural changes, whether there are cracks, whether it is a through-seam, and ask a professional to deal with it. Take this time should also overhaul or replace the meter.

(9) biogas cabinet, especially wet biogas cabinet is more susceptible to H2S corrosion, usually 3 years a small repair, 5 years a major repair. To cabinet anticorrosion, corrosion of serious steel plate to be replaced in a timely manner, cathodic protection of zinc block should also be replaced at this time, a variety of valves, especially not easy to repair and replace the gate repair is not guaranteed then should be replaced with a new one, to ensure that no problem within 5 years.

(10) the whole digestive system should be fireproof, anti-virus. All electrical equipment should be explosion-proof type, wiring should be well grounded, lightning protection. Resolutely eliminate the seeds of accidents that may cause harm. Strictly prohibit smoking in the fire, explosion-proof police area, and to prevent the possibility of sparks and other open flames, such as entering the area of the car should wear a fire hat, enter the person should leave the fire. Nailed shoes and wear static-producing work clothes are not allowed to enter. In addition the alarm instrument and so on should be normal maintenance. On time to the authority to identify, calibrate to ensure that can work properly. Also have a good fire fighting equipment, gas respirator, dry cell flashlight in case of emergency.