CN1161291C

CN1161291C - Power generation technique by utilizing sewage treatment

Info

Publication number: CN1161291C
Application number: CNB011024089A
Authority: CN
Inventors: 桐吴; 吴桐
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-01-20
Filing date: 2001-01-20
Publication date: 2004-08-11
Anticipated expiration: 2021-01-20
Also published as: CN1367142A

Abstract

The present invention discloses a novel power generation technique by using sewage treatment. Treated water is obtained after sewage passes through a filtering device, a sand settling tank, a primary settling tank, an aeration tank and a secondary settling tank; the kinetic energy and the potential energy of a self-designed anticorrosion hydraulic turbine with a low water head are used for power generation. In addition, sludge discharged from the second settling of the primary settling tank undergoes the processes of concentration, first-stage digestion, second-stage digestion and dehydration to obtain dewatered sludge and methane; the dewatered sludge and the methane are combined and incinerated for power generation. The power generation technique by using sewage treatment can automatically generate power for the internal use of the system when the sewage is treated, and therefore, the cost is greatly reduced.

Description

A kind of sewage disposal electricity-generating method

Technical field

The present invention relates to a kind of sewage disposal electricity-generating method, relate in particular to and a kind ofly utilize the kinetic hydraulic energy that produces in the sewage treatment process, potential energy generating and utilize the combine method of burning electricity generation of mud and biogas.

Technical background

Along with socioeconomic continuous development, the quantity discharged of trade effluent, sanitary wastewater grows with each passing day, and the foundation of sewage work is also essential.The current consumption of sewage work is quite big, but itself is not with generating set, causes its running cost very high, seriously restricts further developing of sewage disposal technology.

Summary of the invention

The objective of the invention is to utilize combine burning electricity generation technology and be fit to the sewage disposal technology of these generation technologies of the kinetic hydraulic energy, potential energy and the mud that produce in the sewage treatment process and biogas, thereby reduce sewage work's running cost, promote the development of sewage disposal technology.

For achieving the above object, the present invention introduces screen apparatus with sewage, the bulk dirt is tackled out, by entering settling pit behind the pump house lifting head, in settling pit, remove sand, stone and the macrobead thing of wrapping up in band in the sewage, water outlet enters primary sedimentation pond, and (clearance is about about 50% the suspended substance sedimentation removal in the sewage, BOD ₅Value can be fallen about 25%), enter the aeration tank then, the metabolism by microorganism becomes CO with the most of pollutent in the sewage ₂And H ₂O, microorganism flows into secondary sedimentation basins continuously with water in the aeration tank after reaction, and active sludge flows to the aeration tank front end at post precipitation by pipeline and blowback, mixes with water inlet, and the secondary sedimentation basins supernatant liquid discharges after reaching emission standard; According to certain drop, the anticorrosion hydraulic generator unit of installing low water head is exported electric energy for personal in the factory at the discharge water water outlet; The mud that settling tank produces is through concentrating, after the one-level digestion, secondary digestion, mechanical dehydration, sending in the boiler and burn; Partial organic substances in digestive process in the mud is cleared up, and produces biogas through collecting, and sends into the utilization of boiler internal combustion; In boiler, mud and biogas are sent into burning according to a certain percentage, introduce turbine driven set by the high-temperature high-pressure steam that boiler produces, and the output electric energy is for using in the factory; Whole process adopts distributing system control.

Sewage generating method of the present invention takes the lead in utilizing the hydraulic energy in the sewage treatment process to generate electricity, and mud and the biogas that produces in the treating processes fully utilized, adopt mud and the biogas burning electricity generation that combines, thereby can solve most of power consumption of sewage work, greatly reduce the operation cost of sewage work, adopt the anticorrosion water turbine of low water head simultaneously, improve the effect of the generating of waterpower.

Description of drawings

Fig. 1 is the typical process flow sheet of sludge treatment electricity-generating method of the present invention.

Embodiment

Below, in conjunction with Fig. 1 the present invention is described in further detail.

Mark among the figure: 1, screen apparatus, 2, pump house, 3, settling pit, 4, primary sedimentation pond, 5, the aeration tank, 6, secondary sedimentation basins, 7, water turbine, 8, generating set, 9, mud concentrates, 10, one-level digestion, 11, secondary digestion, 12, dehydration, 13, boiler, 14, biogas, 15, generating set.

The present invention includes the following step:

1, sewage is introduced screen apparatus, by grid, filter screen, drag for mao machine etc. and exclude solid impurity in the raw waste water, cause the accident owing to fiber stops up mesh for avoiding dragging in mao machine operational process, the waterhead signal can be installed before and after filter screen, in case stop up, guard signal takes place in waterhead telltale automatically.

2, the sewage of handling through the first step screen apparatus is evacuated to subsequent processing through pump house.

3, the water of being released by pump house enters settling pit, after pressurization fills carbonic acid gas and reaches saturation value under the specified pressure state, supersaturation liquid is reduced to normal pressure suddenly, this is that the air that is dissolved in the water promptly discharges with very tiny bubble, the particle that is suspended state in trickle bubble that these are numerous and the sewage produces and adheres to, make these particulate density of having carried countless trickle bubbles secretly produce the come-up effect less than water, through this operation sandstone is decomposed, make this heavy sinking, what this was floating floats up.

4, the sewage that will go up an operation is evacuated to primary sedimentation pond, and (its clearance is about 50%, BOD to get rid of suspended substance in the sewage ₅Value can reduce about 25%)

5, the sewage of being handled well by a last operation enters the aeration tank, and the current in the aeration tank are state in the shape of a spiral.The mutual frictional impact of suspended particulate in the sewage makes the organism that sticks to the inorganic particle surface be washed away, and organic content is lower than 5% in the final sedimentary inorganic particulate matter, is beneficial to subsequent disposal; This device is also had effects such as preaeration, deodorization, de-bubble simultaneously.Metabolism by microorganism in the aeration tank becomes the most of pollutent in the sewage into CO ₂And H ₂O, microorganism flows into secondary sedimentation basins continuously with water in the aeration tank after reaction, and active sludge flows to the aeration tank front end at post precipitation by pipeline and blowback.

6, discharge after its supernatant liquid of sewage that enters secondary sedimentation basins reaches emission standard, at the discharge water water outlet according to certain drop, installing hydraulic generator unit, the output electric energy is for using by oneself in the factory.This water turbine adopts the anticorrosion water turbine of low water head, is suitable for the 2m-25m head.

7, the mud of primary sedimentation pond and secondary sedimentation basins generation enters sludge concentration device, through sending into boiler behind concentrated, once digestion, secondary digestion, the mechanical dehydration.

8, cleared up in once digestion, partial organic substances in the secondary digestion process in the mud and produce collecting methane and get up to send boiler.

9, in boiler, the dewatered sludge and the biogas that are produced by preceding two procedures burn according to certain mixed.Simple sludge incineration its calorific value that generates electricity is low, also will add ignition dope, could stable burning, and generating efficiency is low-cost high; Simple employing marsh gas power generation is low because of sludge digestion biogas rate, the biogas output instability.Part can be cleared up organism and produces biogas through digestion in the mud, and the biogas calorific value is higher, is blended in the boiler by a certain percentage through collection storage and mud and burns, the water endothermic gasification of boiler, become high-temperature high-pressure steam, the acting of in steam turbine, expanding, band merit generator output electric energy.Utilize biogas and the mud burning electricity generation that combines, biogas is as the oxidizer of mud, flameholding like this, and the generating efficiency height, electric power output is stable.

Claims

1, a kind of sewage disposal electricity-generating method, utilize to produce kinetic hydraulic energy, potential energy and mud and the biogas electricity-generating method that combines in the sewage treatment process when disposing of sewage, it is characterized in that: present method is utilized the kinetic hydraulic energy, the potential energy that produce in the sewage treatment process to promote the anticorrosion water turbine of low water head when disposing of sewage and is driven generator for electricity generation; Simultaneously the mud that produces after the sewage disposal is through concentrating, sending in the boiler after the one-level digestion, secondary digestion, mechanical dehydration and burn, partial organic substances in one-level digestion, secondary digestive process in the mud is cleared up, the biogas that produces is through collecting, burn according to also send into boiler with the certain proportion of the dewatered sludge behind the mechanical dehydration, burn and produce the water vapor generating.

2, sewage disposal electricity-generating method according to claim 1, when it is characterized in that described biogas and dewatered sludge combine burning electricity generation by a certain percentage, biogas is as the oxidizer of dewatered sludge.

3, sewage disposal electricity-generating method according to claim 1 is characterized in that the position of the anticorrosion water turbine of described low water head can be installed according to certain drop in water port.