Treatment method for domestic sewage and organic solid wastes

Abstract

The invention relates to the field of environmental engineering and particularly relates to a method for treating domestic sewage and organic and degradable solid wastes. According to the technical scheme, the treatment method for the domestic sewage and the organic solid wastes is characterized by comprising the following steps of (1) collecting the organic and degradable solid wastes, carrying out crushing treatment and adding water to adjust to prepare slurry of which the moisture content is greater than 50%; (2) separating black water from grey water, mixing the black water and the slurry obtained in the step (1) and entering the mixture into a first ecological treatment device or / and a precipitation device after passing through an anaerobic reactor, an aerobic bioreactor and an aerobic ecological reactor; and (3) entering the grey water into the precipitation device in the step (2) and then entering a second ecological treatment device for purification. By adopting the scheme, the treatment method for the domestic sewage and the organic and degradable solid wastes capable of treating the degradable organic wastes and the domestic sewage at the same time is provided.

Description

technical field [0001] The invention relates to the field of environmental engineering, in particular to a method for treating domestic sewage and organic easily degradable solid waste. [0002] technical background [0003] At present, most urban domestic sewage in my country adopts the traditional treatment method, that is, the sewage is collected through the collection pipe network and then transported to the sewage treatment plant for unified treatment. This treatment method has the following defects: ① The construction cost of sewage treatment process facilities and sewage pipe network is high; ② The sewage often consumes power during the transportation process, which increases the operating cost; ③ The sewage is prone to leakage during transportation in the pipe network, causing pollution; Increased reuse costs. Therefore, with the prominent problem of water resource shortage, and based on the existing economic conditions in our country, especially for the sewage treatme...

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Problems solved by technology

[0003] At present, most urban domestic sewage in my country adopts the traditional treatment method, that is, the sewage is collected through the collection pipe network and then transported to the sewage treatment plant for unified treatment. This treatment method has the following defects: ① The construction cost of sewage treatment process facilities and sewage pipe network is high; ② The sewage often consumes power during the transportation process, which increases the operating cost; ③ The sewage is prone to leakage during transportation in the pipe network, causing pollution; Increased cost of reuse

Therefore, with the prominent problem of water resource shortage, and based on the existing economic conditions in our country, especially for the sewage treatment of distributed sources of domestic sewage (such as residential quarters, rural areas, small towns, schools and even households) , when the traditional urban domestic sewage centralized treatment mode is applied, it is difficult to promote and the treatment effect is not good

[0004] The in-situ distributed treatment technology of domestic sewage develops relatively slowly in my country, and its technology is basically divided into three categories: ① Physicochemical treatment technology, that is, the use of flocculants to treat domestic sewage and discharge it after sedimentation, also known as enhanced primary treatment treatment, its advantage is that the treatment process is simple, the disadvantage is that the treatment cost is relatively large, and the treatment effect needs to be improved; Stability can guarantee the treatment effect, but the disadvantage is that the operation cost is relatively high, and the management and maintenance are more troublesome; ③ Ecological treatment technology, common technologies such as ecological pond, artificial wetland, underground infiltration, etc., have the advantages of low treatment cost and landscape effect, and the disadvantages The process is greatly affected by the site and climate

[0005] At present, in my country, organic and easily degradable solid wastes from residents' lives, agricultural product production and processing, and enterprises are generally mixed with other solid wastes for treatment. Common treatment methods include landfill, incineration and composting, but common methods There are still some problems, such as landfill needs to occupy a large amount of land, incineration is easy to produce secondary pollutants, and composting treatment efficiency is low

On the other hand, organic easily degradable solid waste is a kind of resource, and the organic matter contained in it can be converted into methane, biochar and other energy sources. Therefore, anaerobic methane production of organic matter has become one of the common ways of resource utilization of kitchen waste. However, most of the existing kitchen waste and other organic easily degradable solid waste anaerobic methanogenesis processes are treated separately, and there is no coordinated treatment with domestic sewage, especially black water, which leads to the carbon-nitrogen ratio of the existing kitchen waste and other separate treatment processes. Unbalanced, low gas production, low water content, anaerobic effluent needs further treatment, etc., need to add additional medicine and water for adjustment, there are problems such as low efficiency and high operating costs

[0006] At present, the common idea of ​​in-situ ecological treatment technology for domestic sewage is to collect and treat domestic sewage in a unified manner, instead of collecting and treating domestic sewage according to the characteristics of different sources of domestic sewage (such as the classified collection of feces water and laundry water). The patent No. CN1312231, although considering the treatment of domestic organic waste and domestic sewage together, did not consider the separate collection of black water with high organic concentration and gray water with low organic concentration, but domestic sewage and domestic organic waste. Garbage enters the anaerobic tank for fermentation and then is treated aerobically, so that the entry of a large amount of low-concentration gray water will affect the efficiency of anaerobic digestion, and the subsequent process uses biological methods instead of ecological methods, which is not conducive to domestic sewage treatment and residential area landscape. Combination of construction; the patent with the publication number CN1523171, although it considers treating the gray water as a single reuse method for flushing the toilet, it does not involve the treatment of black water and the disinfection of the treated water after treatment, nor does it specifically mention The detailed structure of the gray water treatment device does not take into account the treatment of some easily degradable organic waste

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