CN101863583A

CN101863583A - Technology for treating piggery wastewater by methane tank, biofilm reactor and artificial wetland

Info

Publication number: CN101863583A
Application number: CN201010152262A
Authority: CN
Inventors: 万金保; 顾平; 吴永明; 熊继海
Original assignee: Nanchang University
Current assignee: Nanchang University
Priority date: 2010-04-21
Filing date: 2010-04-21
Publication date: 2010-10-20

Abstract

The invention discloses technology for treating piggery wastewater by a methane tank, a biofilm reactor and an artificial wetland. The technology comprises the following steps of: establishing a hydrolytic acidification tank, the methane tank, and a sedimentation tank in front of a sequencing batch biofilm reactor (SBBR) in turn; and establishing an aquatic emergent plant pool and an aquatic cash crop pool. The piggery wastewater flows from the hydrolytic acidification tank and flows out of the aquatic cash crop pool. The time parameters of the SBBR operating condition and technological condition are that: the time for water inlet is 1 hour, the time for anaerobic treatment is 3 hours, the time for aerobic treatment is 7 hours, the time for sedimentation is 0.5 hour, and the time for drainage is 0.5 hour. The wastewater subjected to comprehensive treatment reaches the emission standard.

Description

Methane-generating pit-biofilm reactor-artificial swamp is handled piggery wastewater technology

Technical field

The present invention relates to field of environment engineering technology, particularly the combination process of large-scale pig farm wastewater treatment qualified discharge.

Background technology

The large scale of pig farm waste water treatment process mainly contains nature at present and handles, goes back field processing, three kinds of patterns of industrial treatment.Such as, (SBBR) is little with floor space for the sequencing batch biofilm reactor technology, and the processing efficiency height is simple to operate and be widely used in the processing of high density, difficult degradation sewage, and is especially better to the removal effect of organism, suspended solids.The artificial swamp technology with its cheap, higher N, P clearance, be easy to management, environmental benefit is good etc., and many advantages are used widely.But which kind of method treatment effect is all undesirable, or effluent quality does not reach emission request, or cost is too high can't be applied in China, and therefore single sewage disposal technology is difficult to satisfy large-scale pig farm wastewater treatment economy, requirement efficiently.

Summary of the invention

Purpose of the present invention; be primarily aimed at large scale of pig farm field waste water after the methane-generating pit anaerobic digestion; the shortcoming that nutritive element is out of proportion, ammonia-nitrogen content is high; consider that simultaneously advanced nitrogen, the degree of depth remove organic problem, methane-generating pit-sequencing batch biofilm reactor-multistage artificial swamp combination process is provided.Raise pigs waste water after treatment, and water quality reaches GB18596-2001 " livestock and poultry breeding industry pollutant emission standard " requirement.

Technical scheme of the present invention is: utilize methane-generating pit, sequencing batch biofilm reactor (SBBR) and multistage artificial swamp trinity comprehensive treating process piggery wastewater.Promptly set gradually hydrolysis acidification pool, methane-generating pit, settling tank before SBBR, set up the aquatic emergent pool and aquatic cash crop pool secondary artificial swamp successively after SBBR, piggery wastewater flows out from the aquatic cash crop pool and reaches emission standard.

Specific embodiment is as follows:

Piggery wastewater is collected and is held back through mechanical grille through the sewage collecting pipe network, removes macrobead pollution substance and floating matter in the sewage, enters hydrolysis acidification pool;

Anaerobic environment in the hydrolysis acidification pool makes organic waste generation biological degradation, plays the effect that the waste water quality water yield of raising pigs is regulated simultaneously, and hydrolysis acidification pool is set to underground type;

Methane-generating pit under the waste water inflow place that hydrolysis acidification pool comes out is through efficient anaerobic digestion, after removing most COD and obtaining biogas, overflow enters settling tank, because the SBBR reactor is an intermittent loading, settling tank can play the effect of regulating water quality and quantity, and part mud can reflux simultaneously;

The water inlet of SBBR reactor pumps into from settling tank, behind the aerobic/oxygen nitration denitrification of holding concurrently, further removes the pollutents such as COD, ammonia nitrogen and phosphorus in the waste water; SBBR operation condition and processing condition are: intake 1 hour, anaerobism 3 hours aerobic 7 hours, precipitates 0.5 hour, draining 0.5 hour;

Multistage artificial swamp is passed through in the water outlet of SBBR reactor again, be the aquatic emergent pool and the aquatic cash crop pool, utilize different plants to N, P assimilation effect difference, the physics of artificial wet land system mesostroma-waterplant-microorganism, chemistry, biological triple synergies, filter by matrix, absorption, precipitation, ion-exchange, plant absorbing and microbiological degradation are realized the efficient purification to sewage, simultaneously also can be according to the processing power of artificial swamp, suitably adjust the aeration rate of SBBR reactor, make SBBR reactor operating performance and energy input reach optimum combination;

The water of partial hydrolysis acidification pool is introduced the SBBR reactor, to improve nitric efficiency.

The invention has the beneficial effects as follows:

Utilize original underground methane-generating pit to remove organism and suspended substance a large amount of in the waste water, the biomass of follow-up SBBR aerobic process reduces a lot relatively, cubic capacity less than aerobic process volumetrical separately half, obviously reduce floor space;

Surplus sludge volume lacks than independent aerobic process, and sludge yield is much smaller than aerobic under the anaerobic environment.Anaerobic digestion can obtain biomass energy in addition, realizes waste water reclaiming;

The capacity of resisting impact load and the processing power of device have been improved.In addition the water of partial hydrolysis acidification pool is introduced the SBBR pond,, improved nitric efficiency for the denitrification supplementary carbon source;

Make full use of the different treatment usefulness of the different plants of multistage artificial swamp, carry out the advanced nitrogen dephosphorization, play the energy consumption effect that reduces the SBBR system simultaneously.

Waste water reaches GB18596-2001 " livestock and poultry breeding industry pollutant emission standard " requirement after comprehensive treating process.

Description of drawings

Accompanying drawing is that methane-generating pit-biofilm reactor-artificial swamp is handled the piggery wastewater process flow sheet.

Embodiment

Day output is the piggery wastewater of 150m3/d, raw water quality: COD 5000～10000mg/L, NH4+-N 400～1500mg/L TP30～100mg/L.Former water enters hydrolysis acidification pool, enters methane-generating pit again, and the metabolic function that utilizes heterotrophic bacterium resolves into the small organic molecule of readily biodegradable with refractory organic, and mineralising organonitrogen simultaneously, and most of readily biodegradable organism is removed in degraded.But anaerobism is not partly removed NH4+-N, and TN increases on the contrary, methane-generating pit water outlet COD 500～1000mg/L, NH4+-N 400～1500mg/L TP 50～150mg/L; The methane-generating pit water outlet flows into the SBBR reactor, SBBR operation condition and processing condition: intake 1 hour, anaerobism 3 hours, aerobic 7 hours, precipitation 0.5 hour, draining 0.5 hour, SBBR water outlet COD 300～400mg/L, NH4+-N 40～80mg/L TP 5～8mg/L.The advanced treatment of aquatic emergent pool wild rice stem, calamus is passed through in the water outlet of SBBR reactor again, after the advanced treatment of aquatic cash crop pool celery, and comprehensive effluent quality COD100～200mg/L, NH4+-N 30～60mg/L TP 4～8mg/L.

Claims

1. methane-generating pit-biofilm reactor-artificial swamp is handled piggery wastewater technology, it is characterized in that:

(1) sets up hydrolysis acidification pool, methane-generating pit, settling tank before successively at sequencing batch biofilm reactor (SBBR), after sequencing batch biofilm reactor, set up the aquatic emergent pool and aquatic cash crop pool secondary artificial swamp successively;

(2) flow through successively hydrolysis acidification pool, methane-generating pit, settling tank of piggery wastewater flows into the SBBR reactor, the waste water after the SBBR reactor for treatment flow through the successively more aquatic emergent pool and the aquatic cash crop pool;

(3) water inlet of SBBR reactor pumps into from settling tank, and SBBR operation condition and processing condition are: intake 1 hour, anaerobism 3 hours aerobic 7 hours, precipitates 0.5 hour, draining 0.5 hour;

(4) water of partial hydrolysis acidification pool is introduced the SBBR reactor.

2. methane-generating pit-biofilm reactor according to claim 1-artificial swamp is handled piggery wastewater technology, and it is characterized in that: hydrolysis acidification pool is a underground type.