Research On Characteristics And Pollution Control Technology Of Corn Deep-processing Wastewater

Corn deep processing enterprises are big water consumers, the production process can also produce large amounts of high concentration organic wastewater, the end treatment of wastewater is very difficult, if handled improperly discharged into water bodies can cause serious water pollution. How effective realization of corn processing wastewater pollution control, has great practical significance for regional water quality improvement and sustainable development of corn deep processing industry.This is part of the content of the National Science and Technology Major Project "area of Liaohe typical industry source water pollution control and water reuse technology research and demonstration".This paper is based on a typical corn deep processing enterprises, technology transformation program to achieve stable wastewater discharge standards was researched after the study of wastewater characteristics and existing sewage treatment process problem diagnosis; also researched the dynamic membrane bioreactor for corn processing wastewater treatment.1) Three-dimensional fluorescence spectra of secondary sedimentation tank effluent DOM analysis showed that the secondary sedimentation tank effluent were maily with molecular weight greater than and less than0.5k10k substances,containing mainly protein and humic substances, and humic acid pollutants generated in aerobic aeration stage. We also found that there was a significant linear relationship between the secondary sedimentation tank effluent DOC, UV254and total fluorescence intensity.2) When using EGSB+A/O process for corn processing wastewater treatment, application of cleaner production transformation to improve wastewater treatment effects is feasible.The manufacturing and wastewater treatment processes were enhanced by the addition of a centrifuge in the main workshop and vertical flow sedimentation tank for wastewater pretreatment. The improvements led to an increase in EGSB reactor efficiency. COD of the inlet were reduced by59%,hydrogen production was increased by45%.Secondary sedimentation tank effluent CODCr,BOD5,NH4+-N,SS average concentrations were reduced to55mg/L,9mg/L,5mg/L,19mg/L,achieved "starch industrial water pollutant discharge standards". Recycled as feed protein engineering can create economies of1,274,400yuan/year.3) The optimization of process parameters test showed that, the ammonia of corn processing wastewater degradation were significantly affected by dissolved oxygen concentration. When DO=2-2.5mg/L, it can guarantee COD degradation, while not inhibiting the activity of nitrifying bacteria; too low dissolved oxygen (DO<0.5mg/L) or high (DO>4mg/L) are ammonia is not conducive to the degradation.4) Using DMBR technology for corn deep-processing wastewater treatment results showed:DMBR biochemical treatment effect is good.When HRT=22h,sludge concentration=5000mg/L,the effluent CODcr, NH4+-N average concentrations were34.5mg/L,5.2mg/L, the removal rate reached93.1%and94.8%.DMBR Run study showed that using a large start flux and small operation flux mode, dynamic membrane can be formed in a short time (30-60min), while maintaining the stability of a longer running time. After the dynamic film, so that the majority of suspended solids in water retention down, average effluent turbidity of less than1.5NTU. The reactor uses a fixed flux, changing the head of the operation mode, to get a stable amount of water, to solve engineering problems reactor effluent flux caused by the continuous decay.DMBR process effluent has the potential to circulating cooling water system, but the removal of total phosphorus in effluent is needed.5) Corn processing wastewater phosphorus source analysis showed that total phosphorus in corn processing wastewater comes mainly from corn soaked link; Coagulation phosphorus experimental results show that when PAC dosage is1200mg/L, PAM dosage is0.7mg/L, pH=7, you can get a good phosphorus removal, effluent total phosphorus was0.5mg/L. when lime dosage is300mg/L,pH=10.82,the effluent total phosphorus concentration is less than1mg/L, and sodium fluoride compound with lime and phosphorus, as compared with the use of lime and phosphorus removal alone does not significantly improved.