Journal of Earth Sciences & Environmental Studies

ISSN: 2472-6397

Impact Factor: 1.135

VOLUME: 5 ISSUE: 1

Page No: 21-24

Offshore Polluted Water treatment by biocomposites flocculation


Affiliation

Rui Zhang1,2*, Yu Liu3, MeiRong Sun4,  Honglian Zhang2, Zhihui Zhao3, Hui Du2,  Yan Liao2 , QinHua Hou2,

1Shenzhen Institute of Guangdong Ocean University, Shenzhen, 518108, P. R. China

2The Centre of Modern Biochemistry, Guang Dong Ocean University, Guang Dong ZhanJiang. 524088,, P. R. China

3College of Agriculture, Guangdong Ocean University, Zhanjiang, Guangdong 524088, P. R. China

4Shenzhen GuiBao Scinese Science and technology co., LTD. Shenzhen, 518101, P. R. China

Citation

RUI ZHANG, Offshore Polluted Water treatment by biocomposites flocculation (2020) Journal of Earth Sciences & Environmental Studies 5(1) pp:21-24

Abstract

Water of Shenzhen western coastal is heavily polluted, with a DO of 0.3-1.0 mg/L and turbidity of 13. Moreover, the water is in black color with sedimentary silt and bad smell. Therefore, Coastal water purification, silt clearance and smell expelling are necessary in order to recover the offshore ecology. It is urgent to find efficient, cost-effective and environmentally-friendly methods for the coastal sewage treatment. In this paper, the wastewater collected from Da Chan Bay and Qian Hai Bay was treated using various biological flocculants. The results showed that the removal rate of turbidity was 66.1~78.6%, and ammonia nitrogen (H4N+-N) was 44.2~50.9%. TN was 49.8~53.2%, COD was 69.6~64.3%, TP was 47. 5~51.2%, and the removal rate of harmful marine vibrio was 81.3~93.8%. The results showed, the biological flocculants could be used to effectively treat the coastal wastewater.

Key words: polluted water, Shenzhen western offshore,biocomposites flocculation,  treatment

Introduction

The heavy pollution of coastal water is a serious problem all over the world. So is Shenzhen western offshore water[1-3].  Coastal pollution has a negative effect on ocean ecology, the surrounding residents. There were some mathods to be used to restored the pollution. An sustainable plant-based repair method has been introduced in Europe [4]. and coastal mud flat wetlands have a specific optimisation function[5-8], In the mean time, The salt tolerance and restoration mechanism of these plants have been investigated,The restorative plants can reduce the concentration of nitrogen, phosphorus and other nutritive salts [9-11],  the technology was applied in a bio-floating bed[12-15]。But it costly and spent so long times.  Recently, microbial communities was used to reduce discharge of coastal sewage [14-22]. But it had many unstabilizing factor, because of its mobility and openness. Flocculation precipitation technology has been widely used as the main technology of sewage treatment. Especially biological polysaccharide-based materials used as adsorbents in wastewater treatment is a sample and environment-friendly way[23-25]. But it seldom used in treatment of coastal pollution water.

Materials & Methods

Da Chan Bay sewage (black smelly wastewater) was collected in Jan.-Feb., 2013  at Da Chan Bay, locating at E115 degree (113,51’, 41.74”); N23 degree (22,33’ 18”).  (H: 3.9 m, precision: 4.2 m). And Qian Hai Bay polluted water was sampled at Qian Hai Bay Mar.-April., 2013 locating at E114 degree (114,48’, 35.21”); N22 degree (22,57’ 40”).  (H: 4.5 m, precision: 4.3 m).

Shenzhen western offshore wastewater was treated using different flocculants (Table 1),  including (A) chitosan acetic acid solution, (B) carboxymethyl chitosan, (C) cation starch, (D) double tenth eight dimethyl ammonium chloride, (E) chitosan quaternary ammonium salt hydroxypropyl, (b) sodium alga (sodium alginate) and (d) sodium carboxymethylcellulose (CMC), polymerize ferric sulfate(PFe) .  Wastewater that untreated was used as the negative control.

Table 1.  Different ratios and dosages of environment friendly composites used in processing aquaculture wastewater(10ppm respectively)

number

 

1

2

3

4

5

6

7

8

9

10

11

12

ratios 

 

Ab

Bb

Cb

Db

Eb

Ad

Bd

Cd

Dd

Ed

PFeb

Negative

The A, B, C, D, E was added to 10 L wastewater respectively and mixed well. After 10 minutes, b or d was added to the mixture and mixed well. flocculation and sedimentation started to show up after one hour. Then Water quality aws detected.   Water quality include dissolvedoxygen (DO), Chemical Oxygen Demand (COD), ammonia nitrogen (NH3-N),  total nitrogen (TN) and total phosphate(TP) and harmful marine vibrio. 

 

Results

In the present investigation, the wastewater collected from Shenzhen western offshore wastewater was treated using various biological flocculants. Among those flocculants, group1(Ab) and group11(PFeb) showed the best results, by which the DO of polluted water was improved up to 6.3~7.2 mg/L and the turbidity was reduced to 2~3. The removal rate (RR) of turbidity was 66.1~78.6%, and The removal rate (RR) of ammonia nitrogen (H4N+-N) was 44.2~50.9%. The removal rate (RR) of  TN was 49.8~53.2%,  The removal rate (RR) of COD was 69.6~64.3%%, The removal rate (RR) of TP was 47. 5~51.2% , and the removal rate of harmful marine vibrio was 81.3~93.8%. In addition, Ab and Eb were optimum for reducing the turbidity and harmful marine vibrio and TP.   Ab was optimum for removing TN and COD ( Figure 1).  So Ab was the optimum composites.

https://www.siftdesk.org/articles/images/10609/1.png

Fig 1. Removal Rate of polluted water by compounded flocculants

 

Discussion

Polysaccharide-based materials such as chitosan molecules consist of abundant groups of amino and hydroxyl, resulting in their excellent ability of adsorption and coordination. Polysaccharide-based materials used as adsorbents in wastewater treatment WAS developmented quickly in recent. Therefore, chitosan is widely used in the treatment of polluted water in foreign countries. For example, 500 tons of chitosan are consumed annually in Japan for the wastewater treatment, and chitosan is mainly used for the purification of feedwater and drinking water in USA. Flocculation precipitation using compounded bioflocculants is a promising direction in the sewage treatment. However, few studies have thoroughly compared bio-flocculants, organic and inorganic flocculants as well as their compounded flocculants for the treatment of neritic zone wastewater. Our data provided a scientific basis for the application of compounded bioflocculants for the coastal sewage treatment.

Acknowledgement

This research was supported by The Future Industrial Development Fund of Shenzhen (JCYJ20170413111950426), Innovative Strong School Engineering Key Platform Projects by Department of Education in Guangdong Province (2018302), and The National Natural Science Foundation of China((41706129)

References

  1. Sun JL, Ni HG, Zeng H. Occurrence of chlorinated and brominated polycyclic aromatic hydrocarbons in surface sediments in Shenzhen, South China and its relationship to urbanization. J Environ Monit. Vol. 13, No. 10, 2011, pp.2775-2781. PMid:21879097

    View Article      PubMed/NCBI     
  2. Chen B, Kim Y, Westerhoff P. Occurrence and treatment of wastewater-derived organic nitrogen. Water Res. Vol. 45, No. 15, 2011, pp. 4641-4650. PMid:21741064

    View Article      PubMed/NCBI     
  3. Bao LJ, Maruya KA, Snyder SA, et al. China's water pollution by persistent organic pollutants. Environ Pollut. Vol. 163, 2012, pp. 100-108. PMid:22325437

    View Article      PubMed/NCBI     
  4. Gao X, Chen CT. Heavy metal pollution status in surface sediments of the coastal Bohai Bay. Environ Pollut. Vol. 2 , No. 3, 2012, pp.1901-1911. PMid:22285040

    View Article      PubMed/NCBI     
  5. Shepard CC, Crain CM, Beck MW. The protective role of coastal marshes: a systematic review and meta-analysis. PLoS One. Vol. 6 , No. 11 , 2011, pp. e273-274. PMid:22132099

    View Article      PubMed/NCBI     
  6. El-Sheekh M M, Khairy H M, El-Shenody R A. Allelopathic effects of cyanobacterium Microcystis aeruginosa Kutzing on the growth and photosynthetic pigments of some algal species. Allelopathy. Vol. 26, No. 10 , 2010, pp. 275-289.

  7. Bert V, Seuntjens P, Dejonghe W. Phytoremediation as a management option for contaminated sediments in tidal marshes, flood control areas and dredged sediment landfill sites. Environ Sci Pollut Res Int. Vol. 16 , No. 7 , 2009 , pp. 745-764. PMid:19533193

    View Article      PubMed/NCBI     
  8. Alireza R. Zomorrodi, Costas D, et al. A Multi-Level Optimization Framework for the Metabolic Modeling and Analysis of Microbial Communities . PLoS Computational Biology, Vol. 8 , No. 2 , 2012 , pp. 1002-1063. PMid:22319433

    View Article      PubMed/NCBI     
  9. Jiang D, Huang L, Lin Y, et al. Inhibitory effect of Salicornia europaea on the marine alga Skeletonema costatum. Sci China Life Sci. Vol. 55, No. 6 , 2012 , pp. 551-558. PMid:22744186

    View Article      PubMed/NCBI     
  10. Lv S, Jiang P, Chen X. Multiple compartmentalization of sodium conferred salt tolerance in Salicornia europaea. Plant Physiol Biochem. Vol. 51, No.5 , 2012 , pp. 47-52. PMid:22153239

    View Article      PubMed/NCBI     
  11. Fan P, Feng J, Jiang P. Coordination of carbon fixation and nitrogen metabolism in Salicornia europaea under salinity: Comparative proteomic analysis on chloroplast proteins.Proteomics. Vol. 11, No. 22 , 2011 , pp. 4346-4367. PMid:21905221

    View Article      PubMed/NCBI     
  12. Fan L, Luo C, Sun M . Synthesis of magnetic β-cyclodextrin -chitosan / graphene oxide as nanoadsorbent and its application in dye adsorption and removal. Colloids Surf B Biointerfaces. Vol. 103 , No. 2 , 2013 , pp. 601- 607. PMid:23261586

    View Article      PubMed/NCBI     
  13. Guo J, Chen S, Liu L. Adsorption of dye from wastewater using chitosan-CTAB modified bentonites.J Colloid Interface Sci. Vol. 382, No. 1 , 2012 , pp. 61-66. PMid:22738850

    View Article      PubMed/NCBI     
  14. Chen Q, Ni J. Heterotrophic nitrification-aerobic denitrification by novel isolated bacteria.J Ind Microbiol Biotechnol. Vol. 38 , No. 9 , 2011 , pp. 1305-1310. PMid:21113643

    View Article      PubMed/NCBI     
  15. Li SF, Gao Y. [Effect of powdered activated carbon on the sludge mixed liquor characteristics and membrane fouling of MBR]. Huan Jing Ke Xue. Chinese. Vol. 32, No. 2 , 2011 , pp. 508-514.

  16. Han Y, Liu J, Guo X, Li L.Micro-environment characteristics and microbial communities in activated sludge flocs of different particle size.Bioresour Technol. Vol. 124, No. 5, 2012 , pp. 252-258. PMid:23000719

    View Article      PubMed/NCBI     
  17. Yu Z, Wen X, Xu M, Qi M, Huang X.Anaerobic digestibility of the waste activated sludge discharged from large-scale membrane bioreactors. Bioresour Technol. Vol. 126 , 2012, pp. 358-361. PMid:23131311

    View Article      PubMed/NCBI     
  18. Roslev P, Bukh AS, Iversen L, et al.; Application of mussels as biosamplers for characterization of faecal pollution in coastal recreational waters.Water Sci Technol. Vol. 62 , No. 3 , 2010 , pp. 586-593. PMid:20706005

    View Article      PubMed/NCBI     
  19. Gulkowska A, Leung HW, So MK,et al.; Removal of antibiotics from wastewater by sewage treatment facilities in Hong Kong and Shenzhen, China. Anal Bioanal Chem. Vol. 404, No. 5 , 2012 , pp. 1505 - 1515.

  20. Hughes KA, Blenkharn N. A simple method to reduce discharge of sewage microorganisms from an Antarctic research station.Mar Pollut Bull. Vol. 46, No. 3 , 2003, pp. 353-7. 00224-2

    View Article           
  21. Lemarchand K, Lebaron P. Occurrence of Salmonella spp and Cryptosporidium spp in a French coastal watershed: relationship with fecal indicators. FEMS Microbiol Lett. Vol. 218, No. 1 , 2003 , pp. 203-209. PMid:12583919

    View Article      PubMed/NCBI     
  22. Nanoparticles Hou L, Xia J, Li K, et al.; Removal of ZnO nanoparticles in simulated wastewater treatment processes and its effects on COD and NH(4)(+)-N reduction.Water Sci Technol. Vol. 67, No2 , 2013 , pp. 254-560. PMid:23168621

    View Article      PubMed/NCBI     
  23. Crini G. Recent developments in polysaccharide-based materials used as adsorbents in wastewater treatment. Progress in polymer science. Vol. 30, No. 1 , 2005 , pp. 38-70.

    View Article           
  24. Rui M , Silvaa, João P, et al.; A comparative study of alginate beads and an ion-exchange resin for the removal of heavy metals from a metalplating effluent. Journal of Environmental Science and Health Part A. Vol. 43 , No.6 , 2008 , pp. 1311-1317. PMid:18642155

    View Article      PubMed/NCBI     
  25. Gotoh T, Matsushima K, Kikuchi KI. Preparation of alginate-chitosan hybrid gel beads and adsorption of divalent metalions. Chemosphere. Vol. 55, 2004, pp. 135-40. PMid:14720556

    View Article      PubMed/NCBI     
  26. Liu, B. Z., X. Chen, H. L. Zheng, Y. L. Wang, Y. J. Sun, C. L. Zhao and S. X. Zhang (2018). "Rapid and efficient removal of heavy metal and cationic dye by carboxylate-rich magnetic chitosan flocculants: Role of ionic groups." Carbohydrate Polymers 181: 327-336. PMid:29253979

    View Article      PubMed/NCBI     
  27. Zhang, C. L., M. Y. Zhang and Q. Chang (2015). "Preparation of mercaptoacetyl chitosan and its removal performance of copper ion and turbidity." Desalination and Water Treatment 53(7): 1909-1916.

    View Article           
  28. Deng, G. P., W. Q. Yang, G. Y. Zhou, Y. Li and S. L. Liu (2014). "Heavy metals and polycyclic aromatic hydrocarbons in sediments from the Shenzhen River, South China." Environmental Science and Pollution Research 21(18): 10594-10600. PMid:24875307

    View Article      PubMed/NCBI     
  29. Ding, L. Y., L. Q. Chen, C. Z. Ding and J. Tao (2019). "Global Trends in Dam Removal and Related Research: A Systematic Review Based on Associated Datasets and Bibliometric Analysis." Chinese Geographical Science 29(1): 1-12.

    View Article           
  30. Elliott, M., L. Mander, K. Mazik, C. Simenstad, F. Valesini, A. Whitfield and E. Wolanski (2016). "Ecoengineering with Ecohydrology: Successes and failures in estuarine restoration." Estuarine, Coastal and Shelf Science 176: 12-35.

    View Article           
  31. Chai, M. W., R. L. Li, N. F. Y. Tam and Q. J. Zan (2019). "Effects of mangrove plant species on accumulation of heavy metals in sediment in a heavily polluted mangrove swamp in Pearl River Estuary, China." Environmental Geochemistry and Health 41(1): 175-189. PMid:29876676

    View Article      PubMed/NCBI     

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