The sludge treatment technology mainly includes sludge thickening and dewatering, aerobic digestion, anaerobic digestion, drying, composting and incineration. The sludge disposal technology mainly includes landfill (including ground, underground and water) and land use. Some people mistakenly believe that sludge drying and incineration is the current advanced sludge treatment technology, which represents the development direction of sludge treatment technology, so it is promoted without analysis. Individual companies blindly exaggerate their advanced nature for the purpose of making profits, which misleads many people who don't understand.

Problems in sludge treatment and disposal

1. Low sludge treatment rate

In the early days, sewage treatment plants even ignored the sludge treatment unit and only carried out sewage treatment, but the sludge was dumped at will in lakes, gullies, and fertile fields. In order to save costs, some sewage plants leave sludge treatment facilities empty and discharge sludge at will. More than 80% of the sludge produced by our country’s sewage treatment plants has not been properly treated.

2. The development of heavy water, light sludge, and sludge treatment is lagging behind

In recent years, water treatment in the field of environmental protection has developed rapidly, but sludge treatment has not made much progress compared with a decade ago. The proportion of sludge that has been harmlessly treated is low, and most of the sludge discharged into the country is still harmful, and even illegal discharge incidents are not uncommon. This is due to the immature treatment thinking of "heavy water over mud".

3. The technical route is mechanically copied

The sludge treatment technology mainly includes sludge thickening and dewatering, aerobic digestion, anaerobic digestion, drying, composting and incineration. The sludge disposal technology mainly includes landfill (including ground, underground and water) and ground utilization.

Some people mistakenly believe that sludge drying and incineration is the current advanced sludge treatment technology, which represents the development direction of sludge treatment technology, so it is promoted without analysis. Individual companies blindly exaggerate their advanced nature for the purpose of making profits, which misleads many people who don't understand.

4. Supervision is difficult

Due to the long-term neglect of sludge treatment and the intermittent discharge of sludge, it is difficult for the relevant government departments to supervise the sludge.

5. The payment mechanism is not perfect

The levying of sludge treatment fees in sewage treatment fees is a general trend, but from the current situation, there is a greater resistance to the collection of disposal fees. my country’s current sewage treatment fees are relatively low, and the normal operation of sewage plants cannot be guaranteed. The implementation of adding sludge treatment and disposal fees to sewage treatment fees will increase the economic burden of the expropriated to a certain extent. Therefore, subsidies will be the main source of funds for sludge treatment and disposal for a long period of time in the future.

 How to solve the problem of sludge treatment?

1. Defining the main body of responsibility and improving the management system

The sewage treatment plant is the implementing agency of the government and cannot independently assume responsibility. The government should increase its investment in sludge disposal and grant financial subsidies and tax incentives. Implement the sludge treatment fee into the sewage treatment fee.

2. Enterprises and governments should regard sludge disposal as a responsibility

If the sludge treatment is improper, the sewage treatment company will assume the primary responsibility. Of course, the premise is that the sewage charges must include the cost of sludge treatment.

3. The choice of technical line needs to be adapted to local conditions

The physical, chemical and biological characteristics of the sludge produced by sewage treatment plants in different regions are obviously different. Therefore, it is recommended that the sludge characteristics, geographical location, environmental conditions, and economic and social development levels should be considered when selecting the process route. , Determine the sludge treatment and disposal methods according to local conditions.